A8133 LED BACKLIGHT DRIVER 3W HIGH POWER WHITE LED DRIVER
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1 DESCRIPTION The is a set-up DC-DC converter that delivers a regulated output current. The device switches at a 1.0MHz constant frequency, allowing for the use of small value external inductor and ceramic capacitors. The is targeted to be used for driving loads up to 1A from a two-cell alkaline battery. The LED current can be programmed by the external current sense resistor, Rs, connected between the feedback pin (FB) and ground. A low 95mV feedback voltage reduces the power loss in the Rs for better efficiency. With its internal 2A, 100 mω NMOS switch, device can provide high efficiency even at heavy load. During the shutdown mode, the feedback resistor Rs and the load are completely disconnected and the current consumption is reduced to less than 1uA. FEATURES LED Power Efficiency: up to 90% Current Accuracy: 5% (VIN=3.6V to VF=3.7V) Low Start-Up Voltage: 0.9V(ILED=270mA) Low Hold Voltage:0.75V(ILED=200mA) 1MHz Switching Frequency Uses small, Low Profile External Components Low RDS(ON) : 100mΩ (TYP.) Over Temperature Protection Available in SOT-26 package APPLICATION White LED Torch (Flashlight) White LED Camera Flash DSC(Digital Still Camera)Flash Cellular Camera Phone Flash PDA Camera Flash Camcorder Torch(Flashlight) Lamp The is available in SOT-26 package. TYPICAL APPLICATION ORDERING INFORMATION Package Type Part Number SOT-26 E6 E6R-XXX E6VR-XXX XXX: Feedback Voltage 095=95mV (Typical) Note V: Halogen free Package R: Tape & Reel AiT provides all RoHS products Suffix V means Halogen free Package REV2.0 - JAN 2007 RELEASED MAR 2012 UPDATED
2 PIN DESCRIPTION Top View Pin # Symbol Function 1 SW Switch 2 GND Ground 3 FB Feedback 4 SHDN Shutdown 5 VOUT Output 6 VIN Input REV2.0 - JAN 2007 RELEASED MAR 2012 UPDATED
3 ABSOLUTE MAXIMUM RATINGS These are stress ratings only and functional operation is not implied Exposure to absolute maximum ratings for prolonged time periods may affect device reliability All voltages are with respect to ground. Input Voltage -0.3 to 6V SW Voltage SHDN, FB Voltage -0.3 to 6V -0.3 to 6V Operating Temperature Range -40 to 85 Storage Temperature Range -65 to 125 Lead Temperature (Soldering, 5 sec) 300 Junction Temperature -40 to 125 Ambient Temperature -40 to 85 Stresses above may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated in the Electrical Characteristics are not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. THERMAL INFORMATION Parameter Symbol Maximum Unit Thermal Resistance (Junction to Case) θjc 130 Thermal Resistance (Junction to Ambient) θja 250 /W Internal Power Dissipation PD 400 mw REV2.0 - JAN 2007 RELEASED MAR 2012 UPDATED
4 ELECTRICAL CHARACTERISTICS TA=25, VIN=2.4V, ILED=750mA, VSHDN= VIN, L=2.2uH, CIN=10uF, COUT=10uF, unless otherwise noted. Parameter Symbol Conditions Min Typ. Max Unit Input Voltage Range VIN 0.9 VF-0.2 Feedback Voltage VFB mv Start-up Voltage Hold Voltage VSTART VHOLD Note1 VIN: 0V 3V ILED=270mA 0.9 V VIN: 3V 0V ILED:750mA 200mA 0.75 V Oscillator Frequency FOSC MHz SHDN Input High VSH VIN=1.8V 1.0 V SHDN Input Low VSL VIN=1.8V 0.4 V Over Temperature Shutdown OTS 150 Over Temperature Hysteresis OTH 15 Maximum Output Current Range IO(MAX) 750 ma Quiescent Current IQ ILED=0mA, VOUT=3.4V, 1 3 ma Device Switching at 1MHz Shutdown Current ISD Shutdown mode 1 ua Switch on Resistance RDSON VOUT=3.4V 0.1 Ω Current Limit ILIM VOUT=3.4V 2 A Efficiency η ILED=750mA 90 % NOTE1: V F- LED Forward Voltage V REV2.0 - JAN 2007 RELEASED MAR 2012 UPDATED
5 TYPICAL PERFORMANCE CHARACTERISTICS TA = 25, L= 2.2uH, CIN = 10uF, COUT = 10uF unless otherwise noted. 1. LED Power Efficiency vs. Input Voltage 2. LED Current vs Input Voltage 3. DC Input Current vs Input Voltage 4. Feedback Voltage vs Input Voltage (ILED=750mA@VF=3.7V) 5. Switching Waveform 6. Start-Up Waveform REV2.0 - JAN 2007 RELEASED MAR 2012 UPDATED
6 7. Over Voltage Protection REV2.0 - JAN 2007 RELEASED MAR 2012 UPDATED
7 BLOCK DIAGRAM REV2.0 - JAN 2007 RELEASED MAR 2012 UPDATED
8 DETAILED INFORMATION Inductor Selection The can use small value inductors due to its switching frequency of 1 MHZ. The value of inductor focuses in the range of 2.2uH to 4.7uH for most applications. In typical high current white LED applications, it is recommended to use a 4.7uH inductor. The inductor should have low DCR (DC resistance) to minimize the I 2 R power loss, and it requires a current rating of 2A to handle the peak inductor current without saturating. Capacitor Selection An input capacitor is required to reduce the input ripple and noise for proper operation of the. For good input decoupling, Low ESR (equivalent series resistance) capacitors should be used at the input. At least 2.2uF input capacitor is recommended for most application. A minimum output capacitor value of 6.8uF is recommended under normal operating conditions, while a 10uF-22uF capacitor may be required for higher power LED current. A reasonable value of the output capacitor depends on the LED current. The ESR of the output capacitor is the important parameter to determine the output voltage ripple of the converter, so low ESR capacitors should be used at the output to reduce the output voltage ripple. The small size of ceramic capacitors is an excellent choice for applications. The X5R and X7R types are preferred because they maintain capacitance over wide voltage and temperature ranges. Diode Selection It s indispensable to use a Schottky diode rated at 2A with the. Using a Schottky diode with a lower forward voltage drop is better to improve the power LED efficiency, and its voltage rating should be greater than the output voltage. REV2.0 - JAN 2007 RELEASED MAR 2012 UPDATED
9 LED Current Setting The LED current is set by the single external Rs resistor connected to the FB pin as shown in the typical application circuit on page 1. The typical FB reference is internally regulated to 95mV. The LED current is 95mV/Rs. It's recommended to use a 1% or better precision resistor for the better LED current accuracy. The formula and table 1 for Rs selection are shown as follows: Rs=95mV/ILED Table 1 Rs Resistor Value Selection Standard Value(Ω) ILED(mA) PCB Layout Guidelines As for all switching power supplies, the layout and components placement of the is an important step in the design; especially at high peak currents and high switching frequencies. The input capacitor and output capacitor should be placed respectively as close as possible to the input pin and output pin of the IC; the inductor and schottky diode should be placed as close as possible to the switch pin by using wide and short traces for the main current path; the current sense resistor should be placed as close as possible between the ground pin and feedback pin. REV2.0 - JAN 2007 RELEASED MAR 2012 UPDATED
10 PACKAGE INFORMATION Dimension in SOT-26 Package (Unit: mm) SYMBOL MIN MAX A 1.10MAX. A A b c 0.12REF. D E E e 0.95REF. e1 1.90REF. L 0.45REF. θ 0 10 REV2.0 - JAN 2007 RELEASED MAR 2012 UPDATED
11 IMPORTANT NOTICE AiT Semiconductor Inc. (AiT) reserves the right to make changes to any its product, specifications, to discontinue any integrated circuit product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current. AiT Semiconductor Inc.'s integrated circuit products are not designed, intended, authorized, or warranted to be suitable for use in life support applications, devices or systems or other critical applications. Use of AiT products in such applications is understood to be fully at the risk of the customer. As used herein may involve potential risks of death, personal injury, or servere property, or environmental damage. In order to minimize risks associated with the customer's applications, the customer should provide adequate design and operating safeguards. AiT Semiconductor Inc. assumes to no liability to customer product design or application support. AiT warrants the performance of its products of the specifications applicable at the time of sale. REV2.0 - JAN 2007 RELEASED MAR 2012 UPDATED
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