PRODUCT DATABOOK 1996/1997
SG1842/SG1843 Series
C
URRENT
-M
ODE
PWM C
ONTROLLER
P
R O D U C T I O N
D
A T A
S
H E E T
CHARACTERISTIC CURVES
FIGURE 1.
— DROPOUT VOLTAGE vs. TEMPERATURE
FIGURE 2.
— OSCILLATOR TEMPERATURE STABILITY
2
Minimum Operating Voltage - (V)
10.0
0
SG1842
V
IN
= 15V
Duty Cycle = 50%
Frequency Drift - (%)
SG1843
9.6
9.2
8.8
-2
-4
-6
8.4
8.0
-8
-10
-75
-50
-25
0
25
50
75
100
125
-75
-50
-25
0
25
50
75
100
125
Junction Temperature - (°C)
Junction Temperature - (°C)
FIGURE 3.
— CURRENT SENSE TO OUTPUT DELAY vs.
TEMPERATURE
FIGURE 4.
— OUTPUT DUTY CYCLE vs. TEMPERATURE
200kHz
220
50
Current Sense Delay - (nS)
Output Duty Cycle - (%)
200
180
49
48
47
46
45
44
100kHz
50kHz
50kHz
V
PIN3
= 1.1V
160
100kHz
200kHz
140
120
-75
-50
-25
0
25
50
75
100
125
-75
-50
-25
0
25
50
75
100
125
Junction Temperature - (°C)
Junction Temperature - (°C)
Copyright © 2000
Rev. 1.6 4/00
7
MICROSEMI [ MICROSEMI CORPORATION ]
