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LT3955 Datasheet(PDF) 24 Page - Linear Technology

Part # LT3955
Description  60VIN LED Converter with Internal PWM Generator
PDF  30 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3955 Datasheet(HTML) 24 Page - Linear Technology

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LT3955
24
3955fb
For more information www.linear.com/LT3955
Boost LED Driver with Output Short-Circuit Protection with Internally Generated PWM
Waveform for LED Shorted to GND
Typical applicaTions
1ms/DIV
3955 TA03b
PWMOUT
5V/DIV
DIM = 8V
ILED
0.5A/DIV
VLED+
20V/DIV
20µs/DIV
3955 TA03c
PWMOUT
10V/DIV
ILED
0.2A/DIV
VIN = 24V, DIM = 0V
PWM Dimming Waveform
VIN
SW
LT3955
L1
22µH
GNDK
GND
VC
RT
INTVCC
EN/UVLO
PGND
VREF
ISP
1M
100k
INTVCC
499k
2.2µF
50V
×2
2.2µF
100V
×2
4.7nF
VIN
6V TO 40V
47nF
10nF
107k
5.1k
28.7k
350kHz
121k
124k
20k
CTRL
24.9k
1M
1k
0.5
500mA
1µF
INTVCC
VMODE
DIM/SS
DIM
PWM
ISN
FB
SYNC
PWMOUT
M1
LED+
2.4k
1k
20W
LED
STRING
OPTIONAL CIRCUIT FOR
ALWAYS-ON OPERATION
M1: VISHAY Si7113DN
L1: COILTRONICS DR125-220-R
D1: DIODES PDS3100
D2: VISHAY 10BQ100
Q1: ZETEX FMMT493
Q2: ZETEX FMMT 593
OPTION FOR INTERNAL
PWM DIMMING
3955 TA03a
D2
Q1
Q2
28k
1N4148
D1



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