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BD8119FM-M
● Block diagram
Technical Note
Vin
VREG
C OUT
C IN
UVLO
TSD
OVP
VCC
EN
VREG
PWM
Timer
Latch
OVP
OCP
＋
－
CS
FAIL1
BOOT
Control Logic
OUTH
DRV
SW
－
CTL
SYNC
PWM
RT
OSC
SLOPE
＋
VREG
DGND
CRT
RT
ERR AMP
OUTL
COMP
－
－
－
－
GND
Ccomp
R PC
OCP OVP
＋
LED1
C PC
C SS
SS
SS
Current driver
LED2
LED3
PWM
LED4
VDAC
ISET
PGND
Open Short Detect
ISET
Open Det
R ISET
Timer
Latch
LEDEN1
Fig.13
Short Det
LEDEN2
FAIL2
● Pin layout
● Pin function table
Pin Symbol
Function
COMP
SS
VCC
EN
RT
SYNC
GND
1
2
3
4
5
6
7
28
27
26
25
24
23
22
VREG
BOOT
CS
OUTH
SW
DGND
OUTL
1 COMP
2 SS
3 VCC
4 EN
5 RT
6 SYNC
7 GND
8 PWM
Error amplifier output
Soft start time-setting capacitance input
Input power supply
Enable input
Oscillation frequency-setting resistance input
External synchronization signal input
Small-signal GND
PWM light modulation input
9 FAIL1
10 FAIL2
11 LEDEN1
12 LEDEN2
13 LED1
14 LED2
Failure signal output
LED open/short detection signal output
LED output enable pin 1
LED output enable pin 2
LED output 1
LED output 2
PWM
FAIL1
FAIL2
LEDEN1
LEDEN2
LED1
LED2
8
9
10
11
12
13
14
21
20
19
18
17
16
15
N.C.
PGND
ISET
VDAC
OVP
LED4
LED3
15 LED3
16 LED4
17 OVP
18 VDAC
19 ISET
20 PGND
21 -
22 OUTL
LED output 3
LED output 4
Over-voltage detection input
DC variable light modulation input
LED output current-setting resistance input
LED output GND
N.C.
Low-side external MOSFET Gate Drive out put
23 DGND
24 SW
25 OUTH
Low-side internal MOSFET Source out put
High-side external MOSFET Source pin
High-side external MOSFET Gate Drive out pin
Fig.14
www.rohm.com
? 2011 ROHM Co., Ltd. All rights reserved.
26 CS
27 BOOT
28 VREG
5/20
DC/DC Current Sense Pin
High-side MOSFET Power Supply pin
Internal reference voltage output
2011.08 - Rev.B
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