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UC1843AY-TR View Datasheet(PDF) - Microsemi Corporation

Part Name
Description
Manufacturer
UC1843AY-TR
Microsemi
Microsemi Corporation Microsemi
UC1843AY-TR Datasheet PDF : 8 Pages
1 2 3 4 5 6 7 8
PRODUCT DATABOOK 1996/1997
UC184xA/284xA/384xA
CURRENT MODE PWM CONTROLLER
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 8. OFF-LINE FLYBACK REGULATOR
4.7kW 1W
1N4004
1N4004
AC 1N4004
INPUT
1N4004
220µF
250V
140kW
1/2W
16V
4.7kW
2W
3600pF
400V
1N4935
1N4935
20kW
UC3844A
10µF
7
0.01µF
20V
2 VFB
VCC
150kW
1 COMP
OUT 6
27kW
3.6kW
100pF
0.01µF
8 VREF
10kW
4 RT/CT
.0022µF
CUR
SEN 3
GND
5
1kW
470pF
820pF
2.5kW
0.85kW
TI
MBR735
4700µF
10V
ISOLATION
BOUNDARY
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 UC3844A error amplifier. Load regulation is
therefore dependent on the coupling between secondary and
control windings, and on transformer leakage inductance.
8
Copyright © 1995
Rev. 1.2a 10/25
 

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