LX1570 Ver la hoja de datos (PDF) - Microsemi Corporation
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LX1570 Datasheet PDF : 12 Pages
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PRODUCT DATABOOK 1996/1997
PHASE MODULATED AC SYNCHRONOUS SECONDARY-SIDE CONTROLLER
PR E L I M I N A RY D ATA S H E E T
LX1570/1571
12V/8A SCHEMATIC
80V
f = 100 to 150kHz
(+)
Secondary
Transformer
Voltage
R2, 2W
4.7k
C1, 0.1µF
250V
D8, 1N4937
Q1
IRF530
1
NS
3
T2
6
NP
4
(-)
D2
1N4935
D4
1N4148
D3
1N4001
R3 2.7k
1/2W
C2 0.1
R4 47W
1/2 D1
MUR1620
L1
140µH
Note: Linfinity provides a complete and
tested evaluation board. For further
information contact factory.
VOUT (+)
1/2 D1
MUR1620
4
3
1
2
T1
PE64978
(Note 1)
R5
475W
1%
C9
820µF
16V
C10
820µF
16V
12V/8A
VOUT (-)
VIN
C3
220µF
25V
C4
0.047µF
R12
1MW
Note 2
C6
0.56µF
Core =
T2
N
P
=
NS =
RM4Z
20T #32AWG
60T #32AWG
C5
D6
1µF
1N5819
8765
CT VCC OUT GND
DRV
U1, LX1571
S.S. VFB COMP C.S.
1234
C13
D5
1N5819
Pwr
Gnd
Signal Gnd
R8
SHORT
100W
R11
C8
D7
1N4148
R9
4.99W
1%
C7
1000pF
R6
3.83kW
1%
R7
1kW
1%
FIGURE 8 — THE LX1571 IN A 12V/8A SECONDARY-SIDE POWER SUPPLY APPLICATION
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.
Copyright © 1997
Rev. 0.9.3 1/97
11
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