Datasheet

LT1952/LT1952-1
25
19521fe
TYPICAL APPLICATIONS
V
UL
V
UL
LT4430
C19
1µF X5R
C15
2.2nF 2kV
C24
22pF
+V
OL
R38
18.2k
1952 TA02a
C17
15nF
C16
0.22µF
10V
R27
470Ω
R17
560Ω
R34
12.1k
R35
348k
R31
10Ω
R20 115k
R3 442Ω
R
CSL
0.006Ω
R5
10Ω
LTC4440-5
D1 BAS516
R14
33k
R15 115k
R13
22k
R23 2k
R24 68k
R2 560k
+V
R2
+V
B
V
FB
V
UL
D29
PMEG3002
R32
187k
R28
309k
R30
1.2k
C23
1µF
C14
1µF
C10
100pF
C8
100pF
C21
220pF
C3
1µF
C
UL
4.7µF
C9
100pF
V
FB
R26
220Ω
PS2801-1
D11
BAS516
R21
10k
R19 47.5k
D9
PDZ10B
D5
PDZ10B
R18
10k
R11
47k
R1
2.2Ω
D6
BAS521
D7
BAS521
R16
33k
R54
4.7Ω
R10
1k
R8
2.2Ω
D2
BAS516
D3
BAS516
Q3
HAT2173
C
OL
33µF
X7R
C
SYS
220µF 16V
APXE
Q2
HAT2266
T1
G45R2-0405.005
C12
470pF
C5
0.22µF
Q9
BCX55
220pF
10µH
PE-68386
FB
CG
OUT
V
CC
GND
SS
OPTO
COMP
FB
LTC3900
CS
+
CS
–
CG
V
CC
SYNC
TIMER
GND
FB
1
2
3
6
5
4
8
7
6
5
1
2
3
4
LT1952-1
COMP
FB
R
OSC
SYNC
SS_MAXDC
V
REF
SD_V
SEC
GND
V
CC
GND
INP
BOOST
TG
TS
1
2
3
6
5
4
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
L3
680µH
L2
1.5mH
V
UL
+V
B
+V
IN
+V
IN
18V TO 72V
–V
IN
+V
R2
L1
HR-PQA2050-10
•
•
Q10
PBSS8110
CG
+V
OL
+V
OUT
Q1
HAT2173
FG
7, 8
9, 10, 11
1
6
••
R22
13.3k
Q12
BC856T
C10 0.1µF
C13 0.47µF
D17 BAS516
R45 10k
L53
10µH
C33
0.1µF
Q13
Si2325
C34
0.22µF
OUT
C25
10nF
C
IN
2.2µF
×3
+V
IN
2, 3
•
4, 5
D14
BAS516
+
I
OUT
(A)
0
84
EFFICIENCY (%)
86
88
90
92
96
2
4 6 8
1952 TA02b
10 12
94
85
87
89
91
95
93
24V INPUT
48V INPUT
The 12V Output Converter Fits in a One-Eighth “Brick” Footprint and Has a
Very High Efficiency Over 18V to 72V Input Voltage Range
Wide 18V to 72V Input, High Efficiency, 12V at 12A Output, Active Reset Forward Converter Fits in One-Eighth Brick Footprint