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LT3757 Datasheet(PDF) 8 Page - Linear Technology

Part # LT3757
Description  Boost, Flyback, SEPIC and Inverting Controller
PDF  36 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3757 Datasheet(HTML) 8 Page - Linear Technology

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LT3757

3757fb
block DiagraM
Figure 1. LT3757 Block Diagram Working as a SEPIC Converter
L1
R1
R3
R4
M1
R2
L2
FBX
1.22V
2.5V
D1
CDC
CIN
VOUT
COUT2
COUT1
CVCC
INTVCC
VIN
RSENSE
VISENSE
•
+
+
VIN
IS1
2µA
10
8
7
1
9
SHDN/UVLO
INTERNAL
REGULATOR
AND UVLO
TSD
165˚C
A10
Q3
VC
VC
17.5V
2.7V UP
2.6V DOWN
A8
UVLO
IS2
10µA
IS3
CC1
CC2 RC
DRIVER
SLOPE
SENSE
GND
GATE
108mV
SR1
+
–
CURRENT
LIMIT
RAMP
GENERATOR
7.2V LDO
+
–
+
–
R
O
S
2.5V
G1
RT
RT
SS
CSS
SYNC
1.25V
1.25V
FBX
FBX
1.6V
–0.8V
+
–
+
–
2
3
5
4
+
–
+
–
6
11
RAMP
PWM
COMPARATOR
FREQUENCY
FOLDBACK
100kHz-1MHz
OSCILLATOR
FREQ
FOLDBACK
FREQ
PROG
3757 F01
–
+
+
Q1
A1
A2
1.72V
–0.88V
+
–
+
–
A11
A12
A3
A4
A5
A6
G2
G5
G6
A7
A9
Q2
G4
G3



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