Datasheet

LT3796/LT3796-1
12
3796fa
For more information www.linear.com/3796
BLOCK DIAGRAM
LT3796/LT3796-1 Block Diagram
EN/UVLO
SHORT-CIRCUIT
DETECT
FB1
FB1
FB2
V
C
ISMON
A1
A2
1.22V
1.5V
SCILMB
2.5V
V
LED
gm
EAMP
3µA
PWM
COMPARATOR
TGOFFB
1.25V
ISP
ISP-7V
SHDN
1.25V
ISN
1.1V
100mV
V
S
–
+
–
+
+
+
–
+
–
–
+
1.25V
CTRL
FB2
ISP
SS AND FAULT
LOGIC
SCILMB
TGOFFB
FAULTB
INTV
CC
SS
THERMAL
SHDN
PWM
10µA AT
FB1 = 1.25V
gm
TGEN
(LT3796-1 ONLY)
LT3796-1 ONLY
A3
1.3V
0VFB
COMPARATOR
OVFB1
–
+
X4
–
+
A5
A6
gm
A8
X1
+–
10µA
1V
2.8µA1mA
28µA
CSP
5.5V 5.5V
CSN
+
–
A11
CSOUT
5.5V
FAULT
SS RT SYNC (LT3769 ONLY)
37961 BD
–
+
A7
A9
–
+
FREQ
PROG
–
+
+
RAMP
GENERATOR
100kHz TO 1MHz
OSCILLATOR
PWM V
IN
INTV
CC
FAULTB
DRIVER
I
SENSE
A9
–
+
I
LIM
7.7V
SENSE
GND
GATE
LDO
+
–
A4
Q
R
S
100µA
INTV
CC
V
REF
–
+
1.19V
FB1
2.015V
A7
–
+
100mV
V
LED
C/10 COMPARATOR
WITH 200mV
HYSTERESIS
A7
–
+
A13
A15
A12
A10
A9
A14
VMODE
2.5V
113mV
A16
1.3V
0VFB2
–
+
10µA AT
A6
+
= A6
–
10µA AT
FB2 = 1.25V
LT3796 ONLY