LT1950 Linear Technology, LT1950 Datasheet - Page 16

• Manufacturer Part Number: LT1950
• Description: Single Switch PWM Controller
• Manufacturer: Linear Technology

w w w . D a t a S h e e t . i n
APPLICATIO S I FOR ATIO
LT1950
16
R17, 210k
R4, 18k
0.1 F
4.7k
C1
R1
470k
R9
10V
COMP
+V
BIAS
IN
1
2
3
4
5
6
7
8
UV
100k
COMP
FB
R
SYNC
SLOPE
V
SHDN
GND
OSC
REF
LT1950
BC847BF
Q4
BOOST
BLANK
I
4.7 F
PGND
SENSE
GATE
4.7k
V
R2
V
U
SEC
V
C6
IN2
IN
100k
16
15
14
13
12
11
10
9
470k
R5
UV
U
C
+V
Figure 11. 36V to 72V Input to 3.3V at 20A Synchronous Forward Converter
S
BAT760
IN
D3
R18
27k
18k
R6
4.7k
COMP
10nF
C3
R3
10V
0.1 F
W
BIAS
C
1 F
U1
6
5
4
1000pF
BAS516
U4
HCPL-M453
255
U
R7
D1
C4
TO 72V
INPUT
1
3
10V
10V
36V
8
6
BIAS
BIAS
2
BAT760
U2B
LTC1693-1
4
U2A
LTC1693-1
+V
–V
1
2
3
7
5
220pF
D2
IN
IN
47
2.2 F
100V
T2
X5R
C
IN
C
S
Q1
Si4490
560
R
0.015
S
SYNC
STG-0313W
T1
FG
X5R
1 F
+V
C9, 33nF
7V
01
BIAS
270
1.2k
4.7k
R14
R15
Q2
Si7380
2
R13
CG
1
2
3
4
5
6
7
8
R16
2.8k
CG
V
CG
PGND
GND
OPTO
V
MARG
V
DD
COMP
FB
=1.233V
LTC1698
P
I
C.PI-1365-1R2
–I
WT
SYNC
+I
COMP
Q3
Si7380
2
V
OVP
AUX
SNS
SNS
OK
FG
L1
16
15
14
13
12
11
10
9
SYNC
FG
sn1950 1950fs
C
100 F
X5R
4
0.1 F
+V
3.3V
20A
01
01