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LT1952IGN Datenblatt(PDF) 20 Page - Linear Technology

Teilenummer LT1952IGN
Bauteilbeschribung  Single Switch Synchronous Forward Controller
PDF  24 Pages
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Hersteller  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1952IGN Datenblatt(HTML) 20 Page - Linear Technology

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LT1952/LT1952-1
20
19521fd
APPLICATIONS INFORMATION
LOAD CURRENT (A)
0
25
20
1952 F12
5
10
15
98
96
94
92
90
88
86
VIN = 48V
VOUT = 5V
fOSC = 300kHz
Figure 12. LT1952-Based Synchronous Forward Converter
Efficiency vs Load Current (For Circuit in Figure 14)
Figure 14. 36V to 72V Input to 5V at 20A Synchronous Forward Converter
VDD
CG
PGND
GND
OPTO
VCOMP
VFB
FG
SYNC
VAUX
ICOMP
+ISNS
–ISNS
OVP
LTC1698
1
2
3
4
5
6
8
16
15
14
13
12
11
9
HCPL-M453
0.1μF
10VBIAS
6
5
4
1
2
3
SYNC
7VBIAS
+V0UT
R14
1.2k
R16
12.4k
R15
38.3k
C9, 6.8nF
1μF
X5R
R13
270Ω
0.1μF
T1
PA0491
Q2
PH3830
Q3
PH3830
L1
PA1393.152
C01
100μF
X5R
2
+V0UT
5V
20A
SYNC
220pF
560Ω
T2
SOUT
SOUT
CIN
2.2μF
100V
X5R
+VIN
36V TO 72V
1952 F14
Q1: PHM15NQ20 PHILIPS
SD_VSEC
OUT
OC
ISENSE
PGND
GND
VIN
LT1952-1
BLANK DELAY
912
16
5
6
2
3
4
7
14
11
10
13
8
15
115k
1k
0.1μF
0.1μF
10VBIAS
475k
18.2k
22k
40k
33k
4.75k
9.53k
100k
Q1
0.015Ω
COMP
1
1μF
SYNC
SOUT
SS_MAXDC
VREF
FB
ROSC
VOUT
(200mV/DIV)
0A
IOUT
(5A/DIV)
20μs/DIV
1952 F13
Figure 13. Output Voltage Transient Response
(6A to 12A Load Step at 6A/μs)



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