BD9420F Datasheet, PDF (6/31 Pages) Rohm – White LED Driver for large LCD Panels (DCDC Converter Type)

BD9420F
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
+
+
1/10
+
REF4V
SHORT_DET
Comp +
+
1/10
LSP
0.9V
-
0.9V
-
-
OPEN_DET
Comp ^-
-
+
0.1V
REG75
VREF
1/3
Analog
Dimming
SEL _PWMA
PWMB
PWMC
Figure 5. Blockdiagram
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
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31.Jan.2014 Rev.002