BD9421F_15 Datasheet, PDF (6/31 Pages) Rohm – White LED Driver for large LCD Panels (DCDC Converter Type)

BD9421F
Block Diagram
Datasheet
VIN
CIN
Vo
+
OVP
VCC
STB
REF4V
UVLO
(VCC)
OVP
Protection
REG75
VREG
OPEN
SHORT
Detect
CP counter
TSD
OCP
・・・
OSC CLK
REG75
Control Logic
N
RT
OSC
PGND
CS
ERROR
OSC CLK
Soft Start
SS counter
AGND
-
PGND
FB
RFB
CFB
-
ERR
-
AMP
-
VREF*2/3
+
REF4V
0.9V
SHORT_DET
+
+
Comp +
+
-
1/10
1/10
0.9V
OPEN_DET
-
-
Comp ^-
-
+
0.1V
REG75
VREF
1/3
Analog
Dimming
PWM
Figure 5. Blockdiagram
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 15 • 001
6/27
TSZ02201-0F1F0C100310-1-2
25.Sep.2015 Rev.003