LX1553 MICROSEMI [Microsemi Corporation], LX1553 Datasheet - Page 6

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

LX1552/3/4/5
6
FIGURE 1. — OSCILLATOR FREQUENCY vs. TIMING RESISTOR
FIGURE 3. — OSCILLATOR DISCHARGE CURRENT vs.
1000
8.50
8.40
8.30
8.20
8.10
8.00
7.90
7.80
7.70
100
0.1
10
1
-75
0.1
C
V
T
C
T
A
CC
T
= 6.8nF
= 25°C
-50
= 22nF
= 15V
TEMPERATURE
(T
A
C
) Ambient Temperature - (°C)
(R
-25
T
= 47nF
T
) Timing Resistor - (k )
1
C
0
T
= 0.1µF
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
25
U
LTRA
P
50
-L
R O D U C T I O N
10
OW
C H A R A C T E R I S T I C C U R V E S
C
V
V
T
C
CC
PIN4
75
= 1nF
S
T
= 3.3nF
= 15V
TART
= 2V
100
-U
P
100
125
C
URRENT
D
, C
A T A
URRENT
FIGURE 2. — MAXIMUM DUTY CYCLE vs. TIMING RESISTOR
FIGURE 4. — OSCILLATOR FREQUENCY vs. TEMPERATURE
100
90
80
70
60
50
40
30
20
10
55
54
53
52
51
50
49
48
47
46
45
S
0
-M
-75
0.1
H E E T
ODE
-50
PWM
(T
A
(R
) Ambient Temperature - (°C)
-25
T
) Timing Resistor - (k )
1
0
25
50
10
V
R
C
75
V
T
T
CC
T
A
= 10k
CC
= 3.3nF
= 25°C
= 15V
= 15V
100
Copyright © 1994
Rev. 1.0a 1/01
100
125