LX1570 View Datasheet(PDF) - Microsemi Corporation
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LX1570 Datasheet PDF : 12 Pages
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LX1570/1571
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
3.3V/10A SCHEMATIC
VP
VP (10 to 30V)
f = 100kHz to 150kHz
(+)
Secondary
Transformer
Voltage
R2, 2W
300W
C1, 0.1µF
50V
D8, 1N4937
Q1
IRLZ44
1
NS
3
T2
6
NP
4
(-)
D4
1N4148
C2 0.1
1/2 D1
MBR2545CT
L1
10µH
PE53700
(Note 1)
Note: Linfinity provides a complete and
tested evaluation board. For further
information contact factory.
VOUT (+)
1/2 D1
MBR2545CT
4
3
1
2
T1
PE64978
(Note 1)
C9
1500
µF
6.3V
C10
1500
µF
6.3V
C11
1500
µF
6.3V
C12
1500
µF
6.3V
3.3V/10A
VOUT (-)
R5
R4 47W
475W
1%
VIN
(17 to 20V)
C3
22µF
25V
C4
0.047µF
1M
C5
1µF
8765
CT VCC OUT GND
DRV
U1, LX1571
S.S. VFB COMP C.S.
D6
1N5819
D5
1N5819
Pwr
Gnd
Signal Gnd
R8
SHORT
Note2
1234
100W
D7
R6
C6
0.56µF
C13
R11
1N4148
R9
324W
1%
3.3W
1%
C7
C8
R7
Core = RM4Z
1000pF
1kW
1%
T2
N
P
=
25T #28AWG
NS = 25T #28AWG
FIGURE 9 — THE LX1571 IN A 3.3V/10A SECONDARY-SIDE POWER SUPPLY APPLICATION
Unless otherwise noted all resistors are 1/4W, 5%.
Note 1: For further information on PE53700 and 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.
Look-ahead SwitchingTM is a trademark of Linfinity Microelectronics Inc.
12
Copyright © 1997
Rev. 0.9.3 1/97
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