BD9285F – Boost 1channel white LED driver

Part Number : BD9285F

Function : Boost 1channel white LED driver

Manufactures : Rohm

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BD9285F image

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Description :

Datasheet Boost 1channel white LED driver For large LCDs BD9285F ●General Description BD9285F is a high efficiency driver for white LEDs and designed for large LCDs. This IC is built-in a boost DCDC converters that employ an array of LEDs as the light source. BD9285F has some protect function against fault conditions, such as the over-voltage protection (OVP), the over current limit protection of DCDC (OCP), LED over current protection (LEDOCP), the open detection of LED string. Therefore BD9285F is available for the fail-safe design over a wide range output voltage. ●Features Current mode DCDC converter Vout discharge circuit as shutdown LED protection circuit (OPEN protection, LED OCP protection) LED protect detection as small PWM dimming signal Over-voltage protection (OVP) and low-voltage protection (SCP: short circuit protection) for the output voltage Vout Adjustable soft start time constant The wide range of analog dimming 0.2V-3.5V The built-in transformation circuit from pulse to DC 2 PWM dimming signal The UVLO detection for the input voltage of the power stage FAIL logic output ●Applications TV, PC display and other LCD backlight system. ●Key Specifications Input voltage range: 9.0V to 18.0V DCDC oscillation frequency: 150kHz (RT=100kΩ) Active current consumption: 1.2mA(Typ.) Operating temperature range: -40℃ to +85℃ ●Package(s) SOP18 W(Typ.) x D(Typ.) x H(Max.) 11.20mm x 7.80mm x 2.01mm Pin pitch 1.27mm Figure 1. SOP18 ●Typical Application Circuit(s) VCC VIN VCC UVLO OVP TC54 STB GATE RT CS Css SS FAILB DIMOUT PWM1 PWM2 ISENSE ADIM_P FB ADIM GND Figure 2. Typical application circuit ○Product structure:Silicon monolithic integrated circuit ○This product is not designed protection against radioactive rays . TSZ02201-0F1F0C100030-1-2 © 2012 ROHM Co., Ltd. All rights reserved. 1/36 11.Jul.2012 Rev.001 TSZ22111・14・001 BD9285F ●Absolute Maximum Ratings (Ta=25℃) Parameter Input voltage STB pin voltage OVP, UVLO, SS, RT, ISENSE, FB, CS, TC54 pin voltage PWM1, PWM2, FAILB, ADIM, ADIM_P pin voltage DIMOUT, GATE pin voltage Power Dissipation Operating Temperature Range Junction Temperature Storage Temperature Range Symbol Vccmax STB OVP, UVLO, SS, RT, ISENSE, FB, CS, TC54 PWM1, PWM2, FAILB, ADIM, ADIM_P DIMOUT, GATE Pd Topr Tjmax Tstg Ratings 20 20 7 20 VCC 687 (*1) -40 to +85 150 -55 to +150 Unit V V V V V mW ℃ ℃ ℃ Datasheet *1 Pd derated at 5.5 mW/℃ for temperature above Ta=25℃, mounted on 70mm×70mm×1.6mm 1 layer glass-epoxy PCB. ●Operation range Parameter VCC Power source voltage DC/DC oscillation frequency The effective range of ADIM signal PWM input frequency range Symbol VCC fsw VADIM FPWM Range 9.0 to 18.0 50 to 800 0.2 to 3.5 100 to 100k Unit V kHz V Hz ●Pin Configuration ●Package dimension, marking diagram OVP UVLO SS RT PWM1 PWM2 FAILB ADIM ADIM_P 1 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 10 TC54 CS BD9285F FB ISENSE VCC Lot No. STB GATE DIMOUT GND […]

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BD9285F Datasheet

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