MP V, 1.3A, Single-cell Step-up White LED Driver with Single Wire Dimming Control
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1 The Future of Analog IC Technology 0V,.3A, Single-cell Step-up White LED Driver with Single Wire Dimming Control DESCRIPTION The is a step-up converter designed for driving arrays of WLEDS from a single cell Lithium Ion battery. The uses current mode, fixed frequency architecture to regulate the LED current, which is measured through an external current sense resistor. Its low 200mV feedback voltage reduces power loss and improves efficiency. The is turned off if an over-voltage condition is present due to an open circuit condition. The includes under-voltage lockout, current limiting and thermal overload protection preventing damage in the event of an output overload. The is available in small 5-pin TSOT23 and 8-pin QFN (2mm x 3mm) packages. FEATURES Internal Power MOSFET Drives up to 0 Series White LEDs Up to 87% Efficiency Single Wire Dimming Control.3MHz Fixed Switching Frequency Open Load Shutdown Low 200mV Feedback Voltage UVLO, Thermal Shutdown Internal.3A Current Limit Available in TSOT23-5 and 2mm x 3mm QFN8 Packages APPLICATIONS 5 ~ 7 LCD Panels Handheld Computers and PDAs Digital Still Cameras Small LCD Displays Monolithic Power Systems, MPS, and The Future of Analog IC Technology are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION V 3.3V - 6V LED String... String 9 LED25 90 Efficiency vs Input Voltage 3 WLEDs,9 Strings 95 Enable/ Dimming Control LED2 LED3 LED26 LED27 EFFICICY (%) PUT VOLTAGE(V) Rev
2 ORDERG FORMATION Part Number Package Top Marking Free Air Temperature (T A ) DJ* TSOT23-5 N6 0 C to +85 C DD** QFN8 (2mm x 3mm) N7 0 C to +85 C * For Tape & Reel, add suffix Z (e.g. DJ Z); For RoHS Compliant Packaging, add suffix LF (e.g. DJ LF Z). ** For Tape & Reel, add suffix Z (e.g. DD Z); For RoHS Compliant Packaging, add suffix LF (e.g. DD LF Z) PACKAGE REFERCE TOP VIEW TOP VIEW NC 2 NC Exposed Pad Connect to TSOT23-5 QFN8 (2mm x 3mm) ABSOLUTE MAXIMUM RATGS () Pin V to +V All Other Pins V to +6.5V Continuous Power Dissipation (T A = +25 C) (2) TSOT W QFN8 (2mm x 3mm)....56W Storage Temperature C to +50 C Recommended Operating Conditions (3) Supply Voltage...2.5V to 6V Pin...V to 36V Operating Junction Temp. (T J )... 0 C to +25 C Thermal Resistance () θ JA θ JC TSOT C/W QFN8 (2mm x 3mm) C/W Notes: ) Exceeding these ratings may damage the device. 2) The maximum allowable power dissipation is a function of the maximum junction temperature T J (MAX), the junction-toambient thermal resistance θ JA, and the ambient temperature T A. The maximum allowable continuous power dissipation at any ambient temperature is calculated by P D (MAX) = (T J (MAX)-T A )/θ JA. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. 3) The device is not guaranteed to function outside of its operating conditions. ) Measured on approximately square of oz copper. Rev
3 ELECTRICAL CHARACTERISTICS V = V = 5V, T A = +25 C, unless otherwise noted. Parameters Symbol Condition Min Typ Max Units Operating Input Voltage V V Supply Current (Shutdown) V = 0V 8 µa Supply Current (Quiescent) V = 0.5V µa Switching Frequency f MHz Maximum Duty Cycle V = 0V 92 % Under Voltage Lockout Under Voltage Lockout UVLO V Rising V Under Voltage Lockout Hysteresis Open Lamp Shutdown Threshold Enable 92 mv V OV V OV Rising 0 2 V OFF Threshold V Falling 0. V ON Threshold V Rising 0.6 V Minimum Dimming Threshold Maximum Dimming Threshold Feedback V = 0V V V = 0.2V V Voltage V =.5V mv Input Bias Current V = 0.V na Output Switch On-Resistance (5) R ON 0.5 Ω Current Limit (5) Duty Cycle = 60%.33 A Thermal Shutdown (5) 50 C Notes: 5) Guaranteed by design. Rev
4 P FUNCTIONS TSOT23-5 Pin # QFN8 Pin # Name 8 2, 5, Exposed Pad 3 6 Pin Function Power Switch Output. is the drain of the internal MOSFET switch. Connect the power inductor and output rectifier to. can swing between and 36V. Ground. Connect exposed pad to plane for proper thermal performance. Feedback Input. The regulates the voltage across the current sense resistor between and. Connect a current sense resistor from the bottom of the LED string to. Connect the bottom of the LED string to. The regulation voltage is 200mV. ON/OFF Control and Dimming Command Input. A voltage greater than 0.6V will turn the part on and less than 0.V will turn the part off. If the pin voltage is between 0.7V and.v, V is regulated between 0V and 200mV. To use PWM dimming, apply a 200Hz to KHz square wave signal with amplitude greater than.5v to this pin. 5 2 Input Supply Pin. Must be locally bypassed. 3 NC No Connect. Rev
5 TYPICAL PERFORMANCE CHARACTERISTICS V = 5V, 3WLEDs 9Strings, unless otherwise noted. EFFICICY (%) Efficiency vs Input Voltage 0WLEDs 3 WLEDs,9 Strings 6 WLEDs 8 WLEDs 5 6 PUT VOLTAGE(V) V 0V/div. V 50mV/div. V OUT AC Coupled 00mV/div. I inductor 500mA/div. Steady State Operation V = 5V, 3 WLEDs,9 Strings 00ns/div. V 0V/div. V 2V/div. V OUT 5V/div. I LED 00mA/div. Enable Startup V = 5V, 3 WLEDs,9 Strings Enable Shutdown Start Up into Openload PWM Dimming V = 5V, 3 WLEDs,9 Strings V = 5V V = 5V, 3 WLEDs,9 Strings V 0V/div. V 2V/div. V OUT 5V/div. I LED 00mA/div. V 20V/div. V 5V/div. V OUT 20V/div. V 0V/div. V 5V/div. V OUT 5V/div. I LED 00mA/div. OUTPUT CURRT (ma) Output Current vs Analog Dimming Voltage V =5V, 3 WLEDs, 9 Strings P VOLTAGE (V) OUTPUT CURRT (ma) Output Current vs PWM Dimming Duty V =5V, 3 WLEDs, 9 Strings f=khz PWM DIMMG DUTY Rev
6 OPERATION The uses a constant frequency, peak current mode boost regulator architecture to regulate the series string of white LEDs. The operation of the can be understood by referring to the block diagram of Figure. At the start of each oscillator cycle the FET is turned on through the control circuitry. To prevent sub-harmonic oscillations at duty cycles greater than 50 percent, a stabilizing ramp is added to the output of the current sense amplifier and the result is fed into the positive input of the PWM comparator. When this voltage equals the output voltage of the error amplifier the power FET is turned off. The voltage at the output of the error amplifier is an amplified version of the difference between the 200mV reference voltage and the feedback voltage. In this way the peak current level keeps the output in regulation. If the feedback voltage starts to drop, the output of the error amplifier increases. This results in more current flowing through the power FET, thus increasing the power delivered to the output. - + AMPLIFIER 200mV for Full Brightness - + PWM COMPARATOR CONTROL LOGIC M ABLE & DIMMG CONTROL Enable + +.3MHz OSC CURRT SSE AMPLIFIER - Figure Functional Block Diagram Rev
7 APPLICATION FORMATION V 3.3V to 6V.7uH MBR0520 C 0uF Enable/ Dimming Control C2 0.7uF Figure 2 Circuit for Driving 9 Strings of 3 WLEDs A typical application circuit can be seen in Figure 2. The 9 strings of 3 white LEDs can be driven from a voltage supply range of 3.3V to 6V at an output current of 80mA. A 0.7µF output capacitor is sufficient for most applications. A.7µH inductor with low DCR (Inductor DC resistance) is recommended to improve efficiency. A 0µF ceramic capacitor is recommended for the input capacitance in the real system. Schottky diodes have fast recovery and a low forward voltage and are recommended. Schottky diodes rated with 500mA are sufficient for the. The has internal soft-start to limit the amount of current through V at startup and to also limit the amount of overshoot on the output. The ramped voltage that is added to the current sense amplifier reduces the current output as the duty cycle increases. As more LEDs are added, the output voltage rises but the current that can be delivered to the load is reduced as well. Setting the LED Current The LED current is controlled by the feedback resistor, R. The current through the LEDs is given by the equation 200mV/R. Table shows the selection of resistors for a given LED current. Table I LED vs. R I LED (ma) R (Ω) Rev
8 LED Current Programming Applying a DC voltage between 0.7V and.v to pin programs a feedback voltage between 0V and 200mV. Thus the analog dimming of LED current can be achieved. The DC dimming voltage must be locally bypassed to prevent noise interfering with the feedback reference level. PWM Dimming Apply a 200Hz to khz square waveform to the pin to implement PWM dimming of the LEDs. The minimum recommended amplitude of the PWM signal is.5v. For high frequency PWM dimming (>khz), it is also recommended that the dimming control be implemented as shown in Figure 3. The cut off frequency of the RC filter should be 0 times lower than that of the input PWM signal. For example, when the PWM frequency is 20kHz, a 20kΩ resistor and 00nF capacitor can be used. The DC voltage on pin is then equal to the PWM high level voltage multiplies the PWM duty. The DC voltage from 0.7V to.v programs the output current from 0~00%. Open Load Protection Open Load protection will shut off the if the output voltage goes too high. In some cases an LED may fail, this will result in the feedback voltage always being zero. The part will run at maximum duty cycle boosting the output voltage higher and higher. If the output ever exceeds 2V, the will shut down. The part will not switch again until the power is recycled. Layout Considerations Careful attention must be paid to the PCB board layout and components placement. Proper layout of the high frequency switching path is critical to prevent noise and electromagnetic interference problems. The current loop of IC, output diode, and output capacitor should be as short as possible. The pin of the IC must be locally bypassed. A RC filter is highly recommended for eliminating the noise on pin. It could be implemented as shown in Figure. Input LED LED2 PWM LED3 Figure Input Bias Filtering Figure 3 High Frequency PWM Dimming Control Rev
9 TYPICAL APPLICATION CIRCUITS V 3.3V -8V C.7uF 6V C3 0.uF 50V L.7uH/A 2 8 D B050 Optional Bias Circuit C 330nF 50V LED+ D2 5.6V ZER LED- 6 Figure 5 Driving 27 WLEDs (9 WLEDs in Series and 3 Strings Paralleled) with 3.3V 8V Input Voltage In order to improve the MOSFET on-resistance at low input voltage and make the chip compatible for high input voltage, the additional bias circuit should be used. V.5V-6V C.7uF 6V Q2 2N390 L C5 D.7uH/A 2.2uF/25V B0530 L2.7uH/A C 0.7uF 25V LED+ D2 5.6V ZER C3 0.uF 25V Required Bias Circuit for High Input Voltage 2 8 LED- 6 Figure 6 Wide Input Voltage Sepic Converter for 27 WLEDs ( 3 WLEDs in Series and 9 Strings Paralleled ) Rev
10 V 3V-6V C 6V R2 L D B050 LED LED2 C2 6V LED3 LED LED5 LED6 LED7 C3 LED8 LED9 LED0 R % Figure 7 Driving 0 WLEDs in Series with 3V 6V Input Voltage V C C2 L A D B0530F 6V 6V D2 ZER DIODE C3 25V 2 8 C 50V WLED+ WLED- 6 R Figure 8 Driving 27 WLEDs (3 WLEDs in Series and 9 Strings) with 3 V Input Voltage Rev
11 PACKAGE FORMATION TSOT TYP 0.95 BSC 5.20 TYP TYP 3 TOP VIEW RECOMMDED LAND PATTERN BSC MAX SEATG PLANE SEE DETAIL "A" FRONT VIEW SIDE VIEW NOTE: GAUGE PLANE 0.25 BSC 0 o -8 o DETAIL A ) ALL DIMSIONS ARE MILLIMETERS. 2) PACKAGE LGTH DOES NOT CLUDE MOLD FLASH, PROTRUSION OR GATE BURR. 3) PACKAGE WIDTH DOES NOT CLUDE TERLEAD FLASH OR PROTRUSION. ) LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMG) SHALL BE 0.0 MILLIMETERS MAX. 5) DRAWG CONFORMS TO JEDEC MO-93, VARIATION AA. 6) DRAWG IS NOT TO SCALE. Rev
12 QFN8 (2mm x 3mm) P ID MARKG P ID SEE DETAIL A P ID DEX AREA BSC TOP VIEW BOTTOM VIEW 0.20 REF P ID OPTION A 0.30x5 TYP. P ID OPTION B R0.20 TYP SIDE VIEW DETAIL A 2.90 NOTE: ) ALL DIMSIONS ARE MILLIMETERS. 2) EXPOSED PADDLE SIZE DOES NOT CLUDE MOLD FLASH. 3) LEAD COPLANARITY SHALL BE 0.0 MILLIMETER MAX. ) DRAWG CONFORMS TO JEDEC MO-229, VARIATION VCED-2. 5) DRAWG IS NOT TO SCALE RECOMMDED LAND PATTERN NOTICE: The information in this document is subject to change without notice. Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. Rev
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