Datasheet

LT1952/LT1952-1
26
19521fe
TYPICAL APPLICATIONS
V
FB
V
UL
CS
LT4430
C19
1µF
C15
2.2nF 2kV
C24
47pF
R38
18.2k
1952 TA03a
C17
10nF
C16
22µF
D11
BAS516
D6
B0540W
R27
470Ω
R34
4.75k
R8
2.2Ω
R35
82.5k
R20 174k
R14
33k
R45 10k
D14 BAS516
R
CS1
0.015Ω
R54
4.7Ω
C34
0.22µF
Q1
Si7430
Q13
Si2325
R15 115k
R13
22k
R23 1.2k
R24 39k
R29 22k
+V
R2
+V
B
SS
V
FB
SS
R28
442k
R33
470k
R32
332k
R30
1.2k
C23
1µF
C25
10nF
R53
200Ω
C33
0.1µF
C
UL
4.7µF
D10
BAT760
C9
100pF
CS
C13
0.47µF
R26
220Ω
PS2801-1
R11
82k
R1
2.2Ω
R50
2.2Ω
R49
2.2Ω
T1
PA0861.004
D2
BAS516
D3
BAS516
Q3
HAT2165
C
OL
100µF
×2
C
SYS
470µF
6.3V
Q2
HAT2165
V
CC
GND
SS
OPTO
COMP
FB
1
2
3
6
5
4
LT1952-1
COMP
FB
R
OSC
SYNC
SS_MAXDC
V
REF
SD_V
SEC
GND
SOUT
V
IN
OUT
PGND
DELAY
OC
I
SENSE
BLANK
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
D17
BAS516
L2
1.5mH
V
UL
+V
B
+V
IN
+V
IN
–V
IN
V
R2
D5
PDZ10B
L1
PA1671.650
Q10
PBSS8110
+V
OUT
7, 8
9, 10, 11
1
6
••
R22 13.3k
Q12
BC856T
C10 0.1µF
C
IN
2.2µF
×2
+V
IN
2, 3
•
4, 5
+
I
OUT
(A)
0
88
EFFICIENCY (%)
89
90
91
92
93
94
10 20 30
1952 TA03b
The High Efficiency of 3.3V Output Converter Allows Tight PCB Layout and
Results in Low Component Temperature Rises
High Efficiency 36V to 72V Input to 3.3V at 30A Output, Active Reset Forward Converter Fits in One-Eighth Brick Footprint