# Switching Regulator IC Series Inductor Calculation for Buck Converter IC

Save this PDF as:

Size: px
Start display at page:

## Transcription

1 Switching Regulator C Series nductor Calculation for Buck Converter C No.107ECY01 This application note covers the steps required in choosing the inductor and to calculate the value used in buck regulator C circuits. Buck (Step-Down) Converter Switching regulators are used in a variety of applications to provide stable and efficient power conversion. A buck converter is a specific type of switching regulator that steps down the input voltage to a lower level output. Fig. 1 shows a typical buck converter circuit when switching element is. When N-ch MOSFET is, current flowing from input N to coil charges the output capacitor C O and supplies output current O. n this scenario, the current flowing through coil produces a magnetic field and electric energy is converted to magnetic energy to be stored. Fig. illustrates the same circuit when switching element is in an state. When is, free-wheeling diode D1 is activated, and the energy stored in coil is released. N O N O D1 R D1 R Fig. 1: Basic Buck Converter Circuit Switching Element Fig. : Basic Buck Converter Circuit Switching Element nductor Current Waveform Fig. 3 shows the inductor s current waveform. is the average inductor current value. When switching element is, current flow is shown during period t of, and voltage () of coil can be calculated by the following equation: () ( ) (1) N N: nput oltage () : -state oltage Drop () : Output oltage () The relation between current and voltage of coil, which has self-inductance, can be calculated using the equation below: d () dt d= () dt d= () dt From equation (), it is clear that by applying additional voltage to the inductor, the reverse-current direction increases by slope /. P Current flowing through the coil during t can be calculated using equation (1), (), and by the following method; T represents current right before switching element turns, P represents current right before switching element turns. T Δ P N t T (3) t t t The next step is to determine current flow in coil when the switching element is. Fig. 3: nductor Current Waveform 01 ROHM Co., td. All rights reserved. 1/4 Nov Rev.C

2 nductor Calculation of Buck Converter From Fig., the coil voltage when in - state is (), can be calculated using the following method: () P (4) D : Forward oltage Drop across D1 () : Output oltage () Using equations () and (4), the current flowing through coil when is is as follows: t T (5) Current flow in the coil is almost the same as the output current; consequently, P (6) T From equations (3) and (6), P during -state is P N t (7) Using equations (5) and (6), P can be calculated during the period when the switching element is : P t (8) On-Duty Calculation On-duty D is the ratio of time the switching element is t versus the switching oscillatory cycle T: t t D t f 1 t f (9) T t t Using (7), (8), and (9), the duty can be calculated using the expression below: D (10) N D By ignoring the voltage drop of the switching element and voltage drop of the diode in equation (10), it is clear that onduty is fixed by the ratio of output voltage over input voltage: D (11) N Maximum Coil Current alue Use equations (9) and (10) to determine t : t D (1) f N f The equation below determines the maximum value of P by substituting (1) into (7): P N N f (13) Equation (14) is used to determine the minimum value T by substituting (13) into (6): T N N f (14) 01 ROHM Co., td. All rights reserved. /4 Nov Rev.C

3 nductor Calculation of Buck Converter Current-difference between max. and min. (P-T) is as follows: P T N N f (15) Equations (13) and (15) show that large inductance and high switching frequency will reduce maximum current (P)and current difference between max. and min. (P-T). nductance alue Calculation Define the ratio of current-difference flowing in coil (P-T) versus output current as current ripple-ratio r. P T r (16) Substitute (15) into (16): N N f r (17) Then, solve (17) for to calculate the inductance value: N N f r (H) (18-1) When the output voltage is high, the calculation can be simplified. N N (H) (18-) f r The inductor value can be increased to reduce the ripple-ratio; however, this will typically result in an inductor size that is physically too big for practical use. Consequently, r is usually set between 0. and 0.5 for buck converters. Maximum Current Flow through the Coil Maximum current flow through the coil can be calculated using the following equation: peak r (A) or N (A) (19) f Current flowing through the coil is a combination of output current and ripple-current. When an abnormality occurs (ex. output short) in a transient load condition and there will be a power surge due to the absence of soft-start feature, and it is possible that the actual current flow through the inductor will exceed the maximum calculated current. Under transient conditions, coil current may increase up to the C s switching current limit. Therefore, the safest approach is to select an inductor with a saturation current rating that exceeds the switching current limit, and not the maximum coil current. N Effective RMS current flowing through the coil Effective current value of triangular wave can be calculated by the following method. rms P T P T (0) 3 By substituting equations (13) and (14) into (0), we arrive at the following: rms N f 1 (A) (1) 1 N D 01 ROHM Co., td. All rights reserved. 3/4 Nov Rev.C

4 nductor Calculation of Buck Converter Example for Coil selection: Determine the operating conditions of the buck converter: - N = 1 nput oltage - = 3.3 Output oltage - = A Output Current - r = 0.3 Output Current Ripple Ratio - = 0.30 State oltage Drop of Switching Element - = 0.6 * Forward oltage Drop of Free Wheel Diode - f = 380 khz Switching Frequency * For synchronized rectifier type power conversion, specify -state voltage drop of lower side element Q (Fig. 4). Calculate the inductance value of the coil by substituting the above parameters into equation (18-1) or (18-). As per equation (18-1), As per equation (18-), (µh) (µh) Using equation (19), the maximum current flowing through the coil is as follows: peak r (A) As per equation (1), the effective current value flowing through the coil is rms (A) Coil selection should be based on the results of the calculations. For this design, 10µH is chosen as the closest standard inductance value. f the selected inductor value is different from the calculated result, adjust the current ripple value r using equation (17), and substitute the revised value into equation (19) to recalculate the maximum current flowing through the coil. r peak (A) N O Q R Fig. 4: Basic circuit configuration of a buck converter using synchronous rectification power conversion. n this example, the upper switching element is in -state. 01 ROHM Co., td. All rights reserved. 4/4 Nov Rev.C

### Evaluation Board: Synchronous Buck Converter Integrated FET

ROHM Switching Regulator Solutions Evaluation Board: Synchronous Buck Converter Integrated FET BU90002GWZEVK-101 (3.3V 1A Output) No.000000000 Introduction This application note will provide the steps

### High performance video signal switcher Five inputs Dual Circuits Video Signal Switchers BA7626F,BA7626FS. 2011.03 - Rev.A 1/6

High performance video signal switcher Five inputs Dual Circuits Video Signal Switchers BA2F,BA2FS No.110EAT01 Description The BA2F/FS is a 5-input video signal switching circuit with a broadband db amplifier

c 2013 ROHM Co., Ltd. All rights reserved. 1/3 2012.04 - Rev.F SIP Design Support Document c 2013 ROHM Co., Ltd. All rights reserved. 2/3 2012.04 - Rev.F SIP Design Support Document c 2013 ROHM Co., Ltd.

### Single Digit LED Numeric Display

LA- D / N Series LED displays Single Digit LED Numeric Display LA- D / N Series LA- D / N series is developed because of the demand for small single digit LED Numeric Display. Materials of emission are

### Taping code. Reel size (mm) 2SCR513P MPT3 4540 T100 180 12 1,000 NC

2SCR53P NPN.0A 50 Middle Power Transistor Datasheet Outline Parameter alue MPT3 CEO 50 I C.0A Base Collector Emitter Features ) Suitable for Middle Power Driver 2) Complementary PNP Types : 2SAR53P 3)

### Selecting IHLP Composite Inductors for Non-Isolated Converters Utilizing Vishay s Application Sheet

VISHAY DALE www.vishay.com Magnetics Selecting IHLP Composite Inductors for Non-Isolated Converters INTRODUCTION This application note will provide information to assist in the specification of IHLP composite

### Power supplies. EE328 Power Electronics Assoc. Prof. Dr. Mutlu BOZTEPE Ege University, Dept. of E&E

Power supplies EE328 Power Electronics Assoc. Prof. Dr. Mutlu BOZTEPE Ege University, Dept. of E&E EE328 POWER ELECTRONICS Outline of lecture Introduction to power supplies Modelling a power transformer

### The Important Points of Multi-layer Ceramic Capacitor Used in Buck Converter circuit

Switching Regulator Series The Important Points of Multi-layer Ceramic Capacitor Used in Buck Converter circuit No.1327EAY7 Multi-layer Ceramic Capacitor (MLCC) with large-capacitance can be used as smoothing-capacitor

### SiC Power Module BSM180D12P3C007

9 8 7 6 SiC Power Module BSM8D2P3C7 Application Motor drive Inverter, Converter Photovoltaics, wind power generation. Induction heating equipment. Circuit diagram 9 8(N.C) 3,4 Features ) Low surge, low

### SPI-8001TW. Switching Regulators. Dual 1.5 A, DC/DC Step-Down Converter. SANKEN ELECTRIC CO., LTD. http://www.sanken-ele.co.jp/en/

Data Sheet 27469.301.1 Designed to meet high-current requirements at high efficiency in industrial and consumer applications; embedded core, memory, or logic supplies; TVs, VCRs, and office equipment,

### HOW TO SELECT VARISTORS

HOW TO SELECT VARISTORS We have three alternatives: - selection of the varistors suitable for the operating voltage of the application - calculating the surge current, energy absorption and average power

### The Flyback Converter

The Flyback Converter Lecture notes ECEN4517! Derivation of the flyback converter: a transformer-isolated version of the buck-boost converter! Typical waveforms, and derivation of M(D) = V/! Flyback transformer

### TN0023 Technical note

Technical note Discontinuous flyback transformer description and design parameters Introduction The following is a general description and basic design procedure for a discontinuous flyback transformer.

### Capacitor Ripple Current Improvements

Capacitor Ripple Current Improvements The multiphase buck regulator topology allows a reduction in the size of the input and put capacitors versus single-phase designs. By quantifying the input and put

### AM radio / FM IF stereo system IC

AM radio / FM IF stereo system IC The is a tuner system IC for electronic tuning for AM radios, FM IF, and MPX. It has been developed for Hi-Fi component applications. The MPX VCO circuit requires no adjustment,

### A Simple Current-Sense Technique Eliminating a Sense Resistor

INFINITY Application Note AN-7 A Simple Current-Sense Technique Eliminating a Sense Resistor Copyright 998 A SIMPE CURRENT-SENSE TECHNIQUE EIMINATING A SENSE RESISTOR INTRODUCTION A sense resistor R S,

### Application Notes. Magnetics. Determining L min for Buck/Boost Converters

Application Notes Magnetics etermining min for Buck/Boost onverters Fundamental oncepts 172 alculating Minimum nductance Buck Type onverters 174 Boost Type onverters 177 Buck-Boost onverters 180-171 APPATON

### Power Electronic Circuits

Power Electronic Circuits Assoc. Prof. Dr. H. İbrahim OKUMUŞ Karadeniz Technical University Engineering Faculty Department of Electrical And Electronics 1 DC to DC CONVERTER (CHOPPER) General Buck converter

### Switch Mode Power Supply Topologies

Switch Mode Power Supply Topologies The Buck Converter 2008 Microchip Technology Incorporated. All Rights Reserved. WebSeminar Title Slide 1 Welcome to this Web seminar on Switch Mode Power Supply Topologies.

### Application Note, Rev.1.0, September 2008 TLE8366. Application Information. Automotive Power

Application Note, Rev.1.0, September 2008 TLE8366 Automotive Power Table of Contents 1 Abstract...3 2 Introduction...3 3 Dimensioning the Output and Input Filter...4 3.1 Theory...4 3.2 Output Filter Capacitor(s)

### Design Considerations for an LLC Resonant Converter

Design Considerations for an LLC Resonant Converter Hangseok Choi Power Conversion Team www.fairchildsemi.com 1. Introduction Growing demand for higher power density and low profile in power converter

### Thick film rectangular

Thick film rectangular (126 size: 1 / 4W) Features 1) Power rating of 1 / 4W 2) Highly reliable chip resistor Ruthenium oxide dielectric offers superior resistance to the elements. 3) Electrodes not corroded

### Switching Regulator Series PCB Layout Techniques of Buck Converter

Switching Regulator Series PCB ayout Techniques of Buck Converter No.07EBY05 PCB layout design for switching power supply is as important as the circuit design. Appropriate layout can avoid various problems

### Current Ripple Factor of a Buck Converter

Application Note Edwin Wang AN1 April 14 Current Ripple Factor of a Buck Converter Abstract Inductor and capacitor forms a low-pass filter in a buck converter. The corner frequency the C filter is always

### Design and Construction of Variable DC Source for Laboratory Using Solar Energy

International Journal of Electronics and Computer Science Engineering 228 Available Online at www.ijecse.org ISSN- 2277-1956 Design and Construction of Variable DC Source for Laboratory Using Solar Energy

### Chapter 17 11/13/2014

Chapter 17 Voltage / Current source conversions Mesh and Nodal analysis in an AC circuit Balance conditions and what elements are needed in a bridge network ECET 207 AC Circuit Analysis, PNC 2 1 Magnitude

### Optimizing Power Efficiency in Point-of-Load Regulators Using SLLM (Simple Light Load Mode) Control. White Paper.

Innovations Embedded Optimizing Power Efficiency in Point-of-Load Regulators Using SLLM (Simple Light Load Mode) Control White Paper ROHM MarketingUSA Presented by ROHM Semiconductor Optimizing Power Efficiency

### THE flyback-current-fed push pull dc dc converter [1], [2]

1056 IEEE TRANSACTIONS ON POWER ELECTRONICS, OL. 14, NO. 6, NOEMBER 1999 A New Flyback-Current-Fed Push Pull DC DC Converter Domingo A. Ruiz-Caballero, Student Member, IEEE, and Ivo Barbi, Senior Member,

### Introduction to Power Supplies

Introduction to Power Supplies INTRODUCTION Virtually every piece of electronic equipment e g computers and their peripherals calculators TV and hi-fi equipment and instruments is powered from a DC power

### SML-S1 Series. Data Sheet. Features. Outline. Surface mount Lans LEDs. Narrow directivity and high brightness. Availability of reverse mounting.

Features Outline Surface mount Lans LEDs Narrow directivity and high brightness Availability of reverse mounting Size 3216(1206) size 3.2 1.6mm (t=1.85mm) Color Type V U D Y M P E B Dimensions Recommended

### Low frequency transistor ( 20V, 5A)

2SB386 / 2SB42 / Transistors Low frequency transistor (, A) 2SB386 / 2SB42 / Features ) Low CE(sat). CE(sat) = 0.3 (Typ.) (IC/IB = 4A / 0.A) 2) Excellent DC current gain characteristics. 3) Complements

### MIC4575. Features. General Description. Applications. Typical Application. 200kHz Simple 1A Buck Regulator

00kHz Simple 1A Buck Regulator General Description The is a series of easy to use fixed and adjustable BiCMOS step-down (buck) switch-mode voltage regulators. The 00kHz duplicates the pinout and function

### PAM2804. Pin Assignments. Description. Applications. Features. Typical Applications Circuit 1A STEP-DOWN CONSTANT CURRENT, HIGH EFFICIENCY LED DRIVER

1A STEP-DOWN CONSTANT CURRENT, HIGH EFFICIENCY LED DRIER Description Pin Assignments The is a step-down constant current LED driver. When the input voltage is down to lower than LED forward voltage, then

### Properties of electrical signals

DC Voltage Component (Average voltage) Properties of electrical signals v(t) = V DC + v ac (t) V DC is the voltage value displayed on a DC voltmeter Triangular waveform DC component Half-wave rectifier

### Rectifying Diode RR264MM-400TF

Rectifying Diode RR264MM-400TF Datasheet AEC-Q0 Qualified Series Dimensions (Unit : mm) Land size figure (Unit : mm) General Rectifying.6±0. 0. 0.± 0.05.2 0.85 Application 3.05 General rectification 2.6±0.

### ANADOLU UNIVERSITY DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING

ANADOLU UNIVERSITY DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING EEM 102 INTRODUCTION TO ELECTRICAL ENGINEERING EXPERIMENT 9: DIODES AND DC POWER SUPPLY OBJECTIVE: To observe how a diode functions

### Chapter 6: Converter circuits

Chapter 6. Converter Circuits 6.. Circuit manipulations 6.2. A short list of converters 6.3. Transformer isolation 6.4. Converter evaluation and design 6.5. Summary of key points Where do the boost, buck-boost,

### Design of an Auxiliary Power Distribution Network for an Electric Vehicle

Design of an Auxiliary Power Distribution Network for an Electric Vehicle William Chen, Simon Round and Richard Duke Department of Electrical & Computer Engineering University of Canterbury, Christchurch,

### Diode Applications. As we have already seen the diode can act as a switch Forward biased or reverse biased - On or Off.

Diode Applications Diode Switching As we have already seen the diode can act as a switch Forward biased or reverse biased - On or Off. Voltage Rectifier A voltage rectifier is a circuit that converts an

### TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic TAR5SB15~TAR5SB50

TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic TARSB~TARSB Point Regulators (Low-Dropout Regulator) TARSB~TARSB The TARSBxx Series is comprised of general-purpose bipolar single-power-supply

### MP2365 3A, 28V, 1.4MHz Step-Down Converter

The Future of Analog IC Technology MP365 3A, 8,.MHz Step-Down Converter DESCRIPTION The MP365 is a.mhz step-down regulator with a built-in Power MOSFET. It achieves 3A continuous output current over a

### PoNET kbd48cnc. User s manual

PoNET kbd48cnc User s manual Version: 16/10/2012 SAFETY INFORMATION! This product is intended for integration by the user into a computer numerical control (CNC) machine. It is the user's responsibility

### 3-Phase Synchronous PWM Controller IC Provides an Integrated Solution for Intel VRM 9.0 Design Guidelines

3-Phase Synchronous PWM Controller IC Provides an Integrated Solution for Intel VRM 9.0 Design Guidelines Odile Ronat International Rectifier The fundamental reason for the rapid change and growth in information

### AP1510. General Description. Features. Applications. Typical Application Circuit PWM CONTROL 3A STEP-DOWN CONVERTER AP1510. x (1+R A = V FB /R B

Features General Description Input voltage: 3.6 to 23 Output voltage: 0.8 to CC. Duty ratio: 0% to 100% PWM control Oscillation frequency: 300kHz typ. Current Limit, Enable function Thermal Shutdown function

### TM MP2305 2A, 23V SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER

The Future of Analog IC Technology TM TM MP305 A, 3 Synchronous Rectified Step-Down Converter DESCRIPTION The MP305 is a monolithic synchronous buck regulator. The device integrates 30mΩ MOSFETS that provide

### DC-DC Converter Basics

Page 1 of 16 Free Downloads / Design Tips / Java Calculators / App. Notes / Tutorials / Newsletter / Discussion / Components Database / Library / Power Links / Software / Technical Articles / On-Line Textbook

### Design A High Performance Buck or Boost Converter With Si9165

Design A High Performance Buck or Boost Converter With Si9165 AN723 AN723 by Kin Shum INTRODUCTION The Si9165 is a controller IC designed for dc-to-dc conversion applications with 2.7- to 6- input voltage.

### Item Symbols Conditions Ratings Units Repetitive peak reverse voltage VRRM - 600 V

TS985C6R Low-Loss Fast Recovery Diode Maximum Rating and Characteristics Maximum ratings (at Ta=25 C unless otherwise specified.) Item Symbols Conditions Ratings Units Repetitive peak reverse voltage VRRM

### LM2576R. 3.0A, 52kHz, Step-Down Switching Regulator FEATURES. Applications DESCRIPTION TO-220 PKG TO-220V PKG TO-263 PKG ORDERING INFORMATION

LM2576 FEATURES 3.3, 5.0, 12, 15, and Adjustable Output ersions Adjustable ersion Output oltage Range, 1.23 to 37 +/- 4% AG10Maximum Over Line and Load Conditions Guaranteed 3.0A Output Current Wide Input

### APPLICATION NOTE - 017

APPLICATION NOTE - 017 PWM Motor Drives Theory and Measurement Considerations Pulse Width Modulated (PWM) power electronic techniques represent a large and increasing proportion of modern power electronics.

### AN4829 Application note

Application note Fishbone diagrams for a forward converter Rosario Costanzo, Antonino Gaito Introduction The purpose of this application note is to highlight all of the critical conditions affecting power

### HARMONICS - Understanding the Facts - Part 3 Richard P. Bingham

HARMONICS - Understanding the Facts - Part 3 Richard P. Bingham Abstract Understanding what is important to know about harmonics can be challenging for those without extensive electrical engineering backgrounds.

### CE8301 Series. Introduction. Features. Ordering Information. Applications SMALL PACKAGE PFM CONTROL STEP-UP DC/DC CONVERTER

SMALL PACKAGE PFM CONTROL STEP-UP DC/DC CONVERTER Introduction The is a CMOS PFM-control step-up switching DC/DC converter that mainly consists of a reference voltage source, an oscillator, and a comparator.

### Custom Products. Magnetic Components. Vishay Dale. www.vishay.com

Magnetic Components SWITCH MODE MAGNETICS AIR CORE INDUCTORS INDUCTIVE PRODUCTS CUSTOM DESIGN AND PRODUCTION has extensive facilities for custom design and production of custom magnetics. Design applications

### AN2389 Application note

Application note An MCU-based low cost non-inverting buck-boost converter for battery chargers Introduction As the demand for rechargeable batteries increases, so does the demand for battery chargers.

### Lecture - 4 Diode Rectifier Circuits

Basic Electronics (Module 1 Semiconductor Diodes) Dr. Chitralekha Mahanta Department of Electronics and Communication Engineering Indian Institute of Technology, Guwahati Lecture - 4 Diode Rectifier Circuits

### DATA SHEET PNP SILICON EPITAXIAL TRANSISTOR FOR HIGH-VOLTAGE HIGH-SPEED SWITCHING

DATA SHEET SILICON POWER TRANSISTOR 2SA1010 PNP SILICON EPITAXIAL TRANSISTOR FOR HIGH-VOLTAGE HIGH-SPEED SWITCHING The 2SA1010 is a mold power transistor developed for highvoltage high-speed switching,

### Half-Wave Rectifiers

Half-Wave Rectifiers Important Points of This Lecture Calculation of output voltage using appropriate piecewise models for diode for simple (unfiltered) half-wave rectifier Differences between calculations

### SML-D1 Series EXCELED TM

EXCELED TM Features Outline EXCELED TM series Original device technology enables high brightness and high reliability Size 1006 1608 (0402) (0603) 1.0 0.6mm 1.6 0.8mm (t=0.2mm) (t=0.55mm) Color Type V

### Keywords: input noise, output noise, step down converters, buck converters, MAX1653EVKit

Maxim > Design Support > Technical Documents > Tutorials > Power-Supply Circuits > APP 986 Keywords: input noise, output noise, step down converters, buck converters, MAX1653EVKit TUTORIAL 986 Input and

### NPN General Purpose Transistor

NPN General Purpose Transistor Features 1) BCEO < 45 (IC=1mA) 2) Complements the BC857B. External dimensions (Unit : mm) Package, marking, and Packaging specifications Part No. Packaging type SST3 Marking

### Minimize Standby Current in Automotive DDR Supplies David Gilbert

July 13 Volume 23 Number 2 I N T H I S I S S U E straighten out your power source priorities 8 µmodule DC/DC combines high efficiency switching with low noise linear regulation 18 reference clock distribution

### Chapter 14: Inductor design

Chapter 14 Inductor Design 14.1 Filter inductor design constraints 14.2 A step-by-step design procedure 14.3 Multiple-winding magnetics design using the K g method 14.4 Examples 14.5 Summary of key points

### EET272 Worksheet Week 9

EET272 Worksheet Week 9 answer questions 1-5 in preparation for discussion for the quiz on Monday. Finish the rest of the questions for discussion in class on Wednesday. Question 1 Questions AC s are becoming

### Line Reactors and AC Drives

Line Reactors and AC Drives Rockwell Automation Mequon Wisconsin Quite often, line and load reactors are installed on AC drives without a solid understanding of why or what the positive and negative consequences

### The power supply employs a single ended forward topology. (see Figure 3) The targeted performance figures for the supply are as follows:

Application Note 9 July, A8W, KHz Forward Converter Using QFET by I.S. Yang Introduction The inherent performance advantage of power MOSFETs makes their use very attractive in switched mode power supplies.

### Output Filter Design for EMI Rejection of the AAT5101 Class D Audio Amplifier

The AAT50 is a high efficiency, 2.5W mono class D audio power amplifier. It can be used in portable devices, such as MP4s, cell phones, laptops, GPS and PDAs. The device can work as a filterless class

### SK54B SCHOTTKY RECTIFIER

Applications: SCHOTTKY RECTIFIER Features: Switching power supply Converters Free-Wheeling diodes Reverse battery protection Disk drives Battery charging Small foot print, surface mountable Very low forward

### ZXCT1081 HIGH VOLTAGE HIGH-SIDE CURRENT MONITOR. Description. Pin Assignments. Applications. Features. Typical Application Circuit ZXCT1081

HIGH VOLTAGE HIGH-SIDE CURRENT MONITOR Description Pin Assignments The is a high side current sense monitor with a gain of 10 and a voltage output. Using this device eliminates the need to disrupt the

### Module 11: Conducted Emissions

Module 11: Conducted Emissions 11.1 Overview The term conducted emissions refers to the mechanism that enables electromagnetic energy to be created in an electronic device and coupled to its AC power cord.

### DISCRETE SEMICONDUCTORS DATA SHEET. BT151 series C Thyristors

DISCRETE SEMICONDUCTORS DATA SHEET Product specification April 24 Product specification GENERAL DESCRIPTION QUICK REFERENCE DATA Passivated thyristors in a plastic SYMBOL PARAMETER MAX. MAX. MAX. UNIT

### S101D01/S101D02 S201D01/S201D02

S1D1/S1D/S1D1/S1D S1D1/S1D S1D1/S1D 1-Pin DIP Type SSR for Low Power Control Features 1. Compact ( 1-pin dual-in-line package type). RMS ON-state current I T : 1.Arms 3. Built-in zero-cross (S1D, S1D ).

### Power Electronics. Alberto Tibaldi. July 13, 2010

Power Electronics Alberto Tibaldi July 13, 2010 Contents 1 Switch-mode power supplies 9 1.1 Introduction............................ 9 1.1.1 Introduction to basic topologies of switching-mode converters...........................

### MH88500. Hybrid Subscriber Line Interface Circuit (SLIC) Preliminary Information. Features. Description. Applications. Ordering Information

Hybrid Subscriber Line Interface Circuit (SLIC) Features Differential to single ended conversion No transformers required Minimum installation space Off-Hook detection and LED indicator drive Relay drive

### Zener diode GDZ7.5 GDZ7.5. Diodes. Rev.C 1/4. Dimensions (Unit : mm) Applications Constant voltage control

Zener diode Applications Constant voltage control Dimensions (Unit : mm) Features 1) 2-pin ultra mini-mold type for high-density mounting(gmd2) 2) High reliability. 3) Can be mounted automatically,using

### Let s examine the response of the circuit shown on Figure 1. The form of the source voltage Vs is shown on Figure 2. R. Figure 1.

Examples of Transient and RL Circuits. The Series RLC Circuit Impulse response of Circuit. Let s examine the response of the circuit shown on Figure 1. The form of the source voltage Vs is shown on Figure.

### PAM2841. Description. Pin Assignments. Features. Applications. Typical Applications Circuit. A Product Line of. Diodes Incorporated

1.5A SW CURRENT, 40V PRECISION WLED DRIVER Description Pin Assignments The is a white LED driver, capable of driving 10 or more WLEDs in series (depending on forward voltage of the LEDs) with a range of

### ZXLD383 SINGLE OR MULTI CELL LED DRIVER SOLUTION

Summary A Product Line of SINGLE OR MULTI CELL LED DRIVER SOLUTION The is a single or multi cell LED driver designed for applications requiring step-up voltage conversion from a very low input voltage.

### High Performance Schottky Rectifier, 3.0 A

High Performance Schottky Rectifier, 3. A Cathode Anode SMC PRODUCT SUMMARY Package SMC I F(AV) 3. A V R 4 V V F at I F.46 V I RM 3 ma at 25 C T J max. 5 C Diode variation Single die E AS 6. mj FEATURES

### The full wave rectifier consists of two diodes and a resister as shown in Figure

The Full-Wave Rectifier The full wave rectifier consists of two diodes and a resister as shown in Figure The transformer has a centre-tapped secondary winding. This secondary winding has a lead attached

### Old Company Name in Catalogs and Other Documents

To our customers, Old Company Name in Catalogs and Other Documents On April 1 st, 2010, NEC Electronics Corporation merged with Renesas Technology Corporation, and Renesas Electronics Corporation took

### UNISONIC TECHNOLOGIES CO., LTD

UPS61 UNISONIC TECHNOLOGIES CO., LTD HIGH PERFORMANCE CURRENT MODE POWER SWITCH DESCRIPTION The UTC UPS61 is designed to provide several special enhancements to satisfy the needs, for example, Power-Saving

### 0.9V Boost Driver PR4403 for White LEDs in Solar Lamps

0.9 Boost Driver for White LEDs in Solar Lamps The is a single cell step-up converter for white LEDs operating from a single rechargeable cell of 1.2 supply voltage down to less than 0.9. An adjustable

### H BRIDGE INVERTER. Vdc. Corresponding values of Va and Vb A+ closed, Va = Vdc A closed, Va = 0 B+ closed, Vb = Vdc B closed, Vb = 0 A+ B+ A B

1. Introduction How do we make AC from DC? Answer the H-Bridge Inverter. H BRIDGE INVERTER Vdc A+ B+ Switching rules Either A+ or A is always closed, but never at the same time * Either B+ or B is always

### SWITCH-MODE POWER SUPPLY CONTROLLER PULSE OUTPUT DC OUTPUT GROUND EXTERNAL FUNCTION SIMULATION ZERO CROSSING INPUT CONTROL EXTERNAL FUNCTION

SWITCH-MODE POWER SUPPLY CONTROLLER. LOW START-UP CURRENT. DIRECT CONTROL OF SWITCHING TRAN- SISTOR. COLLECTOR CURRENT PROPORTIONAL TO BASE-CURRENT INPUT REERSE-GOING LINEAR OERLOAD CHARACTERISTIC CURE

### Renco Electronics, Inc.

Abstract As high tech electronic products and their power supplies continue to shrink in size the peak current handling capability of power inductors should be looked at closely by the design engineer.

### Chapter 20 Quasi-Resonant Converters

Chapter 0 Quasi-Resonant Converters Introduction 0.1 The zero-current-switching quasi-resonant switch cell 0.1.1 Waveforms of the half-wave ZCS quasi-resonant switch cell 0.1. The average terminal waveforms

### Drive circuit basics + V. τ e. Industrial Circuits Application Note. Winding resistance and inductance

ndustrial Circuits Application Note Drive circuit basics For a given size of a stepper motor, a limited space is available for the windings. n the process of optimizing a stepper motor drive system, an

### Schottky Rectifier, 100 A

Schottky Rectifier, A VS-BGQ Cathode Anode PowerTab PRODUCT SUMMARY Package PowerTab I F(AV) A V R V V F at I F 0.82 V I RM 180 ma at 125 C T J max. 175 C Diode variation Single die E AS 9 mj FEATURES

### SSM3K335R SSM3K335R. 1. Applications. 2. Features. 3. Packaging and Pin Configuration. 2012-07-19 Rev.3.0. Silicon N-Channel MOS (U-MOS -H)

MOSFETs Silicon N-Channel MOS (U-MOS-H) SSM3K335R SSM3K335R 1. Applications Power Management Switches DC-DC Converters 2. Features (1) 4.5-V gate drive voltage. (2) Low drain-source on-resistance : R DS(ON)

### An9931. An9931 Unity Power Factor LED Lamp Driver

An9931 Unity Power Factor LED Lamp Driver Features Constant output current Large step-down ratio Unity power factor Low input current harmonic distortion Fixed frequency or fixed off-time operation Internal

### Topic 5. An Interleaved PFC Preregulator for High-Power Converters

Topic 5 An nterleaved PFC Preregulator for High-Power Converters An nterleaving PFC Pre-Regulator for High-Power Converters Michael O Loughlin, Texas nstruments ABSTRACT n higher power applications, to

### AN-1012: Reverse Recovery Time (T RR ) of the Super Barrier Rectifier TM Applications Department, APD Semiconductor, San Jose CA

AN-1012: Reverse Recovery Time (T RR ) of the Super Barrier Rectifier TM Applications Department, APD Semiconductor, San Jose CA There are many elements to a Reverse Recovery Time (T RR ) waveform and

### AP1509. 150KHz, 2A PWM BUCK DC/DC CONVERTER. Description. Pin Assignments V IN. Applications. Features. (Top View) GND GND. Output AP1509 GND GND

Description Pin Assignments The series are monolithic IC designed for a stepdown DC/DC converter, and own the ability of driving a 2A load without additional transistor. It saves board space. The external

### Functions, variations and application areas of magnetic components

Westring 18 3314 Büren Germany T +49 951 60 01 0 F +49 951 60 01 3 www.schaffner.com energy efficiency and reliability 1.1 Transformers The transformer is one of the traditional components of electrical

### ELEC 435 ELECTRONICS I. Rectifier Circuits

ELEC 435 ELECTRONICS I Rectifier Circuits Common types of Transformers The Rectifier Rectification is the conversion of an alternating current to a pulsating direct current. Rectification occurs in both

### AN2435 Application note

AN435 Application note TM sepic converter in PFC pre-regulator Introduction For the PFC (power factor correction) converter, sepic topology can be used when an output voltage lower than the maximum input

### Old Company Name in Catalogs and Other Documents

To our customers, Old Company Name in Catalogs and Other Documents On April 1 st, 2010, NEC Electronics Corporation merged with Renesas Technology Corporation, and Renesas Electronics Corporation took