LX1552 Microsemi Corporation, LX1552 Datasheet - Page 18

• Manufacturer Part Number: LX1552
• Description: ULTRA-LOW START-UP CURRENT/ CURRENT-MODE PWM
• Manufacturer: Microsemi Corporation

LX1552/3/4/5
18
INPUT
AC
SPECIFICATIONS
Input line voltage:
Input frequency:
Switching frequency:
Output power:
Output voltage:
Output current:
Line regulation:
Load regulation:
Efficiency @ 25 Watts,
Output short-circuit current:
3.6k
1N4004
V
V
1N4004
0.01µF
IN
IN
= 90VAC:
= 130VAC:
20k
150k
100pF
1N4004
1N4004
10k
.0022µF
4.7
1W
2
1
8
4
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
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
LX1554
V
COMP
V
R
T
FB
REF
/C
U
16V
220µF
250V
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
LTRA
T
P
-L
GND
V
R O D U C T I O N
7
5
CC
OW
OUT
CUR
SEN
250k
1/2W
FIGURE 36. — OFF-LINE FLYBACK REGULATOR
S
TART
6
3
0.01µF
-U
P
C
4.7k
27k
URRENT
2W
470pF
1k
* This circuit uses a low-cost feedback scheme in which the DC
1N4935
D
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.
10µF
20V
, C
A T A
URRENT
0.85k
3600pF
400V
1N4935
S
-M
H E E T
ODE
820pF
PWM
(continued)
2.5k
BOUNDARY
ISOLATION
TI
MBR735
4700µF
10V
Copyright © 1994
Rev. 1.0a 1/01
2-5A
5V