LX1555MY Microsemi Analog Mixed Signal Group, LX1555MY Datasheet - Page 9
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
Copyright © 1994
Rev. 1.0b
FIGURE 13. — DYNAMIC SUPPLY CURRENT vs.
FIGURE 15. — CURRENT SENSE THRESHOLD vs.
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
30
27
24
21
18
15
12
9
6
3
0
0
10
0
T
R
C
A
T
0.5
L
= 10k
= 25°C
= 1000pF
Error Amplifier Output Voltage - (V)
ERROR AMPLIFIER OUTPUT
OSCILLATOR FREQUENCY
1.0
Oscillator Frequency - (kHz)
1.5
T
A
2.0
= 25°C
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
100
U
2.5
LTRA
T
A
= 125°C
3.0 3.5
P
-L
R O D U C T I O N
OW
C H A R A C T E R I S T I C C U R V E S
T
A
= -55°C
S
TART
4.0
V
V
V
IN
IN
IN
-U
= 16V
= 12V
= 10V
4.5
1000
P
C
5.0
URRENT
D
, C
A T A
URRENT
FIGURE 14. — CURRENT SENSE DELAY TO OUTPUT vs.
FIGURE 16. — START-UP THRESHOLD vs. TEMPERATURE
300
270
240
210
180
150
120
8.8
8.7
8.6
8.5
8.4
8.3
8.2
8.1
8.0
7.9
7.8
30
90
60
S
0
-M
-75
-75
H E E T
ODE
V
V
C
CC
PIN3
L
-50
= 1nF
-50
= 15V
PWM
= 0V to 2V
(T
(T
TEMPERATURE
A
A
) Ambient Temperature - (°C)
) Ambient Temperature - (°C)
-25
-25
0
0
LX1552/3/4/5
25
25
50
50
75
75
LX1553
LX1555
100
100
125
125
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