Datasheet

+
-
+
-
+
-
+
-
+
-
LG
COMP
CFB
AFB
SS/SH
NDRV3 NDRV2 NDRV1SNS1SNS2SNS3REFIN
RT
VCC
SGND
EN
VIN
DLY
SC
+
-
ramp
Linear Reg
ref
+
-
uvlo
TSD
fault T3
EA
I limit
and COMP
clamp
ILIM
CS
blank
time
ramp
sd
+
-
DIM
LED on = A
1.7V
SS/SH logic
ss
ovp/uvp
set_clk
+
-
REF
ref
AFB sense
ovp
MODE/F
+
-
+
-
4V
LED on
+
-
FF
LED
on
FF step scaling
ff
ff
LED on
vcc
PGND
6V
CFB
override
fault
THM
+
-
LEDOFF
Restart Mode
+
-
open
60 uA
2 uA
3.8V
2.8V
short
latch off/restart
logic
Restart Mode
+
-
CFB check
CFB fault
CFB fault
ilimit
QR
S
set_clk
fault T1, T2
uvp
vin
A
B
A
B
LED on
+
-
LM3431
SNVS547G –NOVEMBER 2007–REVISED MAY 2013 www.ti.com
BLOCK DIAGRAM
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