PRODUCT DATABOOK 1996/1997
SG1844/SG1845 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
SG1844
V
IN
= 15V
Duty Cycle = 50%
Frequency Drift - (%)
SG1845
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.
— START-UP CURRENT vs. TEMPERATURE
220
0.7
Current Sense Delay - (nS)
SG1844
200
180
Start-Up Current - (mA)
0.6
0.5
0.4
V
PIN3
= 1.1V
160
140
120
0.3
SG1845
0.2
-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. 1.4 4/00
7
MICROSEMI [ MICROSEMI CORPORATION ]
