LX1555MY Microsemi Analog Mixed Signal Group, LX1555MY Datasheet - Page 18
LX1555MY
Manufacturer Part Number
LX1555MY
Description
IC PWM CURRENT MODE 8.4V 8DIP
Manufacturer
Microsemi Analog Mixed Signal Group
Datasheet
1.LX1554CM.pdf
(18 pages)
Specifications of LX1555MY
Pwm Type
Current Mode
Number Of Outputs
1
Frequency - Max
500kHz
Duty Cycle
48%
Voltage - Supply
11 V ~ 25 V
Buck
Yes
Boost
Yes
Flyback
Yes
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
Yes
Operating Temperature
-55°C ~ 125°C
Package / Case
8-DIP
Frequency-max
500kHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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. 1.0b
2-5A
5V