LX1554 查看數據表（PDF） - Microsemi Corporation
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LX1554 Datasheet PDF : 18 Pages
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PRODUCT DATABOOK 1996/1997
LX1552/3/4/5
ULTRA-LOW START-UP CURRENT, CURRENT-MODE PWM
PRODUCTION DATA SHEET
T Y P I C A L A P P L I C A T I O N C I R C U I T S (continued)
FIGURE 36. — OFF-LINE FLYBACK REGULATOR
TI
4.7Ω 1W
1N4004
1N4004
AC 1N4004
INPUT
1N4004
220µF
250V
250kΩ
1/2W
16V
4.7kΩ
2W
3600pF
400V
1N4935
1N4935
20kΩ
150kΩ
LX1554
7
2 VFB
VCC
0.01µF
1 COMP
OUT 6
27kΩ
10µF
20V
820pF
2.5kΩ
3.6kΩ
100pF
0.01µF
10kΩ
8 VREF
4 RT/CT
.0022µF
CUR
SEN 3
GND
5
1kΩ
470pF
0.85kΩ
ISOLATION
BOUNDARY
MBR735
4700µF
10V
5V
2-5A
SPECIFICATIONS
Input line voltage:
Input frequency:
Switching frequency:
Output power:
Output voltage:
Output current:
Line regulation:
Load regulation:
Efficiency @ 25 Watts,
V = 90VAC:
IN
V = 130VAC:
IN
Output short-circuit current:
90VAC to 130VAC
50 or 60Hz
40KHz ±10%
25W maximum
5V +5%
2 to 5A
0.01%/V
8%/A*
70%
65%
2.5Amp average
* This circuit uses a low-cost feedback scheme in which the DC
voltage developed from the primary-side control winding is
sensed by the LX1554 error amplifier. Load regulation is
therefore dependent on the coupling between secondary and
control windings, and on transformer leakage inductance.
18
Copyright © 1994
Rev. 1.0a 1/01
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