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BD8119FM-ME2 Datasheet(PDF) 5 Page - Rohm |
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BD8119FM-ME2 Datasheet(HTML) 5 Page - Rohm |
5 / 21 page Technical Note 5/20 www.rohm.com 2010.08 - Rev.A © 2010 ROHM Co., Ltd. All rights reserved. BD8119FM-M ● Block diagram Fig.13 ● Pin layout ● Pin function table Fig.14 Pin Symbol Function 1 COMP Error amplifier output 2 SS Soft start time-setting capacitance input 3 VCC Input power supply 4 EN Enable input 5 RT Oscillation frequency-setting resistance input 6 SYNC External synchronization signal input 7 GND Small-signal GND 8 PWM PWM light modulation input 9 FAIL1 Failure signal output 10 FAIL2 LED open/short detection signal output 11 LEDEN1 LED output enable pin 1 12 LEDEN2 LED output enable pin 2 13 LED1 LED output 1 14 LED2 LED output 2 15 LED3 LED output 3 16 LED4 LED output 4 17 OVP Over-voltage detection input 18 VDAC DC variable light modulation input 19 ISET LED output current-setting resistance input 20 PGND LED output GND 21 - N.C. 22 OUTL Low-side external MOSFET Gate Drive out put 23 DGND Low-side internal MOSFET Source out put 24 SW High-side external MOSFET Source pin 25 OUTH High-side external MOSFET Gate Drive out pin 26 CS DC/DC Current Sense Pin 27 BOOT High-side MOSFET Power Supply pin 28 VREG Internal reference voltage output COMP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 SS VCC EN RT SYNC GND PWM FAIL1 FAIL2 LEDEN1 LEDEN2 LED2 LED1 VREG BOOT CS OUTH SW DGND OUTL N.C. PGND ISET VDAC OVP LED3 LED4 DGND RT COMP ERR AMP Vin VREG + - VCC EN RT OVP OSC SS Control Logic UVLO TSD - - + SS PWM LED1 LED2 LED3 Current driver ISET PGND PWM CIN RPC CPC CSS CS RISET FAIL1 - VREG VDAC GND ISET LED4 - BOOT OUTH SW + - FAIL2 LEDEN1 LEDEN2 COUT SYNC RPC CRT Ccomp VREG OVP Timer Latch PWM OCP DRV CTL SLOPE OCP OVP Open Short Detect Timer Latch Short Det Open Det OUTL |
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