LX1571 Microsemi Corporation, LX1571 Datasheet - Page 11

• Manufacturer Part Number: LX1571
• Description: PHASE MODULATED AC SYNCHRONOUS SECONDARY-SIDE CONTROLLER
• Manufacturer: Microsemi Corporation

Copyright © 1997
Rev. 0.9.3
Unless otherwise noted all resistors are 1/4W, 5%.
Note 1: For further information on PE64978 contact Pulse Engineering at 619-674-8100.
Note 2: A high value resistor must be coupled back to "COMP" pin to insure proper operation under light load conditions.
T2
80V
f = 100 to 150kHz
1/97
(+)
(-)
Core = RM4Z
N
N
P
S
=
=
Secondary
Transformer
Voltage
1N4935
220µF
V
IN
25V
C3
20T #32AWG
60T #32AWG
D2
R3
0.047µF
2.7k
1/2W
C4
Note 2
1M
FIGURE 8 — THE LX1571 IN A 12V/8A SECONDARY-SIDE POWER SUPPLY APPLICATION
R12
IRF530
D8, 1N4937
0.56µF
4.7k
P
D3
1N4001
Q1
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
HASE
1N4148
C6
R2, 2W
1
6
M
S.S.
D4
C
8
1
P
T
ODULATED
U1, LX1571
R E L I M I N A R Y
N
N
V
V
7
2
CC
FB
S
P
C1, 0.1µF
R4
COMP
250V
OUT
DRV
C2
1 2 V / 8 A S C H E M A T I C
6
3
C7
AC S
3
4
0.1
GND
47
C.S.
5
4
T2
YNCHRONOUS
C13
1µF
C5
1000pF
Signal Gnd
MUR1620
100
C8
1/2 D1
R11
4
1
PE64978
(Note 1)
D
D6
1N5819
D5
1N5819
475
Pwr
Gnd
S
1%
R5
T1
A T A
ECONDARY
R9
4.99
1%
3
2
D7
1N4148
S
R8
SHORT
-S
1/2 D1
MUR1620
H E E T
IDE
140µH
L1
C
ONTROLLER
Note: Linfinity provides a complete and
tested evaluation board. For further
C9
820µF
16V
information contact factory.
LX1570/1571
C10
820µF
16V
R6
3.83k
1%
R7
1k
1%
12V/8A
V
V
OUT (+)
OUT (-)
11