Datasheet LED Drivers for LCD Backlights White LED Driver for large LCD Panels (DCDC Converter type) BD9394FP, BD9394EFV General Description BD9394FP, BD9394EFV is a high efficiency driver for Features white LEDs and designed for large LCDs. This IC is 4ch LED constant current driver and DC/DC converter built-in a boost DCDC converters that employ an array of Maximum LED Current: 150mA LEDs as the light source. BD9394FP, BD9394EFV has LED Feedback Voltage: 0.37V ( NADIM=2.62V), some protect function against fault conditions, such as so lower heat. Adjustable Feed Back Voltage the over-voltage protection (OVP), the over current limit by following LED Current setting. protection of DCDC (OCP), the short circuit protection 2% LED current accuracy (NADIM=2.62V, (SCP), the open detection of LED string. Therefore when each LED is set to 100mA) BD9394FP, BD9394EFV is available for the fail-safe Analog current (Linear) dimming at NADIM pin design over a wide range output voltage. LED pin rating 60V Individual detection and individual LED OFF for both Key Specification open and short circuits Built-in ISET pin short-circuit protection circuit Operating power supply voltage range: 9.0V to 35.0V LED minimum current 30mA Set Soft-Start time by external capacitor. FETs Gate (N pin) is driven by 5.8V swing LED maximum current: 150mA Built-in Vout discharge circuit for shutdown Oscillator frequency: 150kHz (RT=100k) Built-in Vout overvoltage protection (OVP) / Operating Current: 4.5mA (Typ.) reduced voltage protection (SCP) circuit Operating temperature range: -40 to +85 Adjustable LED Short Protection Voltage by LSP terminal Applications HSOP20, HTSSOP-B24 package with high heat TV, Computer Display, Notebook, LCD Backlighting radiation efficiency Package W(Typ.) x D(Typ.) x H(Max.) HSOP20 14.90mm x 7.80mm x 2.10mm HTSSOP-B24 7.80mm x 7.60mm x 1.00mm Typical Application Circuit (4 light with PWM) Fig.1(a) HSOP20 Fig.1(b) HTSSOP-B24 VIN VIN Inductor Diode CIN COUT REG58 FIN1, 2 CREG RN2 FET ON/OFF REG58 STB RVCC N VCC RCS DN RN1 CVCC DCDC GND DCDC GND CS LED4 RRT CLED4 RT LED3 GND ROVP1 CLED3 COVP OVP LED GND ROVP2 RFB CFB1 FB LED2 REG58 CLED2 RLSP1 CFB2 LSP LED1 RLSP2 CLSP CLED1 PWM SS PWM CSS ISET GND RISET AUTO CAUTO NADIM NADIM Fig.2 Typical Application Circuit Product structureSilicon monolithic integrated circuit This product is not designed protection against radioactive rays . www.rohm.com TSZ02201-0F1F0C100180-1-2 2012 ROHM Co., Ltd. All rights reserved. 1/28 TSZ2211114001 09.May.2014 Rev.003 ConnectorDatasheetDatasheet BD9394FP, BD9394EFV Absolute maximum ratings (Ta=25) Parameter Symbol Ratings Unit Power supply voltage VCC 36 V STB, NADIM, OVP, PWM terminal voltage STB, NADIM, OVP, PWM VCC V LED1 to 4 terminal voltage LED1~4 60 V AUTO, REG58, CS, N, LSP, ISET, SS, FB, RT AUTO, REG58, CS, N, LSP, 7 V terminal voltage ISET, SS, FB, RT Power dissipation 1(HSOP20) Pd1 2.18 *1 W Power dissipation 2(HTSSOP-B24) Pd2 4.00 *2 W Operating temperature range Topr -40~+85 Storage temperature range Tstg -55~+150 Junction temperature Tjmax 150 *1 Ta = 25C or more, diminished at -17.4mW/C in the case of HSOP20 (when 4-layer / 70.0 mm x 70.0 mm x 1.6 mm board is mounted) *2 Ta = 25C or more, diminished at -32.0mW/C in the case of HTSSOP-B24 (when 4-layer / 70.0 mm x 70.0 mm x 1.6 mm board is mounted) Operating Ratings (Ta = 25) Parameter Symbol Limits Unit VCC supply voltage VCC 9.0~35.0 V Min. output current of LED1 to 4 ILED MIN 30 mA *1 mA Max. output current of LED1 to 4 ILED MAX 150 *1,2 Min. output current of LED1 to 4 VNADIM1 0~5.0 *3 V Max. output current of LED1 to 4 VNADIM2 7.0~35.0 V DC/DC oscillation frequency VLSP 0.83.0 V DC/DC oscillation frequency Fsw 100~800 kHz Min. on-duty time for PWM light modulation PWM MIN 30 us *1 The amount of current per channel. *2 If LED makes significant variations in its reference voltage, the driver will increase power dissipation, resulting in a rise in package temperature. To avoid this problem, design the board with thorough consideration given to heat radiation measures. *3 The range which the LED current changes with linearity is from 1.5V to 5V. Pin Configuration HSOP20 1 20 VCC AUTO HTSSOP-B24 2 19 NADIM REG58 3 18 RT CS 4 17 N FB 5 16 SS DCDC GND 6 LSP ISET 15 7 14 OVP PWM 8 LED1 13 LED4 9 12 LED2 LED3 10 11 LED GND STB Fig.3 Pin Configuration www.rohm.com TSZ02201-0F1F0C100180-1-2 2012 ROHM Co., Ltd. All rights reserved. 2/28 TSZ2211115001 09.May.2014 Rev.003