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LT3757 Datasheet(PDF) 11 Page - Analog Devices

Part # LT3757
Description  36V, 4A Synchronous Step-Down LED Driver with Silent Switcher
PDF  22 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LT3757 Datasheet(HTML) 11 Page - Analog Devices

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LT3935
11
Rev. 0
For more information www.analog.com
BLOCK DIAGRAM
25
23
15
+
–
+
INTERNAL VCC
REGULATOR
AND UVLO
2V REFERENCE
SYNCHRONOUS
CONTROLLER
S
R
Q
27
22
1
EN/UVLO
VIN
CIN
CVCC
REN1
RT
REN2
CREF
INTVCC
BST
BOTTOM SWITCH
DRIVER
TOP SWITCH
DRIVER
50m
4.7µF
8.2µH
VIN
VIN
SW
VREF
11
SYNC/SPRD
28
CTRL
N/C
–
+
+
200kHz TO
2MHz
OSCILLATOR
18
19
VOUT
CIN
14
ISN
3935 BD
6
ISP
5
FB
4
–
+
–
+
10
RT
2
SS
3
VC
CSS
CC
RSS
9
RP
200mV
950mV
1.4V
1.0V
20µA
GND
1.25µA
3k
3k
FAULT
LOGIC
FAULT
COMPARATORS
FAULT
LOGIC
CURRENT
REGULATION
AMPLIFIER
gm = 200µS
VOLTAGE
REGULATION
AMPLIFIER
gm = 480µS
PEAK CURRENT
COMPARATOR
1.25V
250mV
PWM
12
ISMON
10x
7
FAULT
INTVCC
INTVCC
RFB1
RFAULT
RFB2
8
–
+
+
CONTROL
BUFFER
30k
A/D
DETECTOR
INTVCC
+
–
+
–
–
+
17
100F
100nF
20
16
21
24
26
N/C
N/C
N/C



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