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UC2845AM Fiches technique(PDF) 8 Page - Microsemi Corporation

No de pièce UC2845AM
Description  CURRENT MODE PWM CONTROLLER
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Fabricant  MICROSEMI [Microsemi Corporation]
Site Internet  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

UC2845AM Fiches technique(HTML) 8 Page - Microsemi Corporation

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C URRENT M ODE PWM C ONTROLLER
UC184xA/284xA/384xA
PRODUCT DA T ABOOK 1996/1997
Copyright © 1995
Rev. 1.2
12/95
8
P RODUCTION D ATA S HEET
TYPICAL APPLICA TION CIRCUITS
(continued)
FIGURE 8. — OFF-LINE FLYBACK REGULATOR
SPECIFICATIONS
Input line voltage:
90VAC to 130VAC
Input frequency:
50 or 60Hz
Switching frequency:
40KHz ±10%
Output power:
25W maximum
Output voltage:
5V +5%
Output current:
2 to 5A
Line regulation:
0.01%/V
Load regulation:
8%/A*
Efficiency @ 25 Watts,
V
IN = 90VAC:
70%
V
IN = 130VAC:
65%
Output short-circuit current:
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.
7
150k
W
100pF
V
FB
COMP
V
REF
R
T/CT
4700µF
10V
5V
2-5A
ISOLATION
BOUNDARY
3600pF
400V
1N4935
820pF
2.5k
W
27k
W
0.01µF
10µF
20V
1N4935
1k
W
470pF
0.85k
W
MBR735
TI
4.7k
W
2W
140k
W
1/2W
220µF
250V
4.7k
W
1W
1N4004
1N4004
1N4004
1N4004
AC
INPUT
V
CC
OUT
CUR
SEN
GND
UC3844A
20k
W
3.6k
W
10k
W
.0022µF
0.01µF
16V
3
6
2
1
8
4
5


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