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LTC7138 Datasheet(PDF) 21 Page - Linear Technology

Part # LTC7138
Description  High Efficiency, 140V 400mA Step-Down Regulator
PDF  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC7138 Datasheet(HTML) 21 Page - Linear Technology

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LTC7138
21
7138f
For more information www.linear.com/LTC7138
L1 CURRENT
500mA/DIV
VIN/VOUT
5V/DIV
L2 CURRENT
500mA/DIV
1s/DIV
7138 TA05b
VIN
VOUT
L1 CURRENT
500mA/DIV
VIN
50V/DIV
VOUT
10V/DIV
L2 CURRENT
500mA/DIV
200ms/DIV
7138 TA05c
TRANSIENT TO 140V
72V
VIN INPUT VOLTAGE (V)
30
85
90
100
95
150
120
7138 TA03b
80
60
90
PWM OPEN
VDIM OPEN
10W LED Driver
7138 TA03a
VFB
OVLO
SW
L1
100µH
VIN
CIN
1µF
250V
X7R
COUT
4.7µF
50V
X7R
VOUT
M1
25V LED
400mA
VIN
32V TO 140V
FBO
VPRG2
ISET
VDIM
VPRG1
SS
RUN
LTC7138
GND
1M
42.2k
1M
27.4k
3.3V
PWM
L1: TDK SLF10145T-101M
D1: TOSHIBA CRH01
M1: VISHAY SILICONIX Si2356DS
VDIM = 0.1V TO 1V FOR 10:1 ANALOG DIMMING
PWM = SQUARE WAVE FOR DIGITAL DIMMING
30V OVERVOLTAGE PROTECTION ON VOUT
D1
ANODE
Low Dropout Startup and
Shutdown
Overvoltage Lockout Operation
Efficiency vs Input Voltage
Typical applicaTions
7138 TA05a
VFB
ISET
SW
L1
100µH
VIN
RUN
CIN1
1µF
250V
X7R
CIN2
1µF
250V
X7R
COUT
47µF
16V
X5R
VOUT*
12V
800mA
VIN
4V TO 90V
UP TO 140V
TRANSIENT
SS
FBO
VPRG1
VPRG2
OVLO
LTC7138
(MASTER)
GND
VFB
ISET
SW
L2
100µH
VIN
RUN
FBO
SS
VPRG2
VPRG1
OVLO
ANODE
LTC7138
(SLAVE)
GND
1M
13.7k
267k
196k
L1/L2: WÜRTH 744 770 910 1
D1/D2: CENTRAL SEMI CMSH1-100M-LTN
*VOUT = VIN FOR VIN < 12V
D2
D1
ANODE
4V to 90V Input to 12V/800mA Output Regulator with Overvoltage Lockout



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