LX1553 MICROSEMI [Microsemi Corporation], LX1553 Datasheet - Page 9

• Manufacturer Part Number: LX1553
• Description: ULTRA-LOW START-UP CURRENT, CURRENT-MODE PWM
• Manufacturer: MICROSEMI [Microsemi Corporation]

Copyright © 1994
Rev. 1.0a 1/01
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
9