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
ELECTRICAL CHARACTERISTICS
Parameter
Current Sense Section
Gain (Notes 5 & 6)
Maximum Input Signal (Note 5)
Power Supply Rejection Ratio (Note 5) PSRR
Input Bias Current
Delay to Output (Note 4)
V
COMP
= 5V
12
≤
V
CC
≤
25V
2.85
0.9
3
1
70
-2
150
0.1
1.5
13.5
13.5
50
50
16
8.4
10
7.6
95
(Cont'd.)
Symbol
Test Conditions
SG1842/43
SG2842/43
SG3842/43
Units
Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.
3.15 2.85
1.1 0.9
-10
300
0.4
2.2
13
12
150
150
17
9.0
11
8.3
100
0
1
17
15
7.8
9
7.0
90
3
1
70
-2
150
0.1
1.5
13.5
13.5
50
50
16
8.4
10
7.6
95
3.15 2.85
1.1 0.9
-10
300
0.4
2.2
13
12
150
150
17
9.0
11
8.2
100
0
14.5
7.8
8.5
7.0
90
3
1
70
-2
150
0.1
1.5
13.5
13.5
50
50
16
8.4
10
7.6
95
3.15
1.1
-10
300
0.4
2.2
V/V
V
dB
µA
ns
V
V
V
V
ns
ns
V
V
V
V
%
%
Output Section
Output Low Level
Output High Level
Rise Time
Fall Time
I
SINK
= 20mA
I
SINK
= 200mA
I
SOURCE
= 20mA
I
SOURCE
= 200mA
T
J
= 25°C, C
L
= 1nF
T
J
= 25°C, C
L
= 1nF
1842
1843
1842
1843
13
12
150
150
17.5
9.0
11.5
8.2
100
0
Under-Voltage Lockout Section
Start Threshold
Min. Operation Voltage After Turn-On
15
7.8
9
7.0
93
PWM Section
Maximum Duty Cycle
Minimum Duty Cycle
Power Consumption Section
Start-Up Current
Operating Supply Current
V
CC
Zener Voltage
V
FB
= V
ISENSE
= 0V
I
CC
= 25mA
0.5
1
0.5
1
mA
11
17
11
17
mA
34
34
V
∆
V
6. Gain defined as: A =
∆
V
COMP
; 0
≤
V
ISENSE
≤
0.8V.
ISENSE
7. Adjust V
CC
above the start threshold before setting at 15V.
0.5
11
34
Notes: 4. These parameters, although guaranteed, are not 100% tested in
production.
5. Parameter measured at trip point of latch with V
VFB
= 0.
4
Copyright © 2000
Rev. 1.6 4/00
MICROSEMI [ MICROSEMI CORPORATION ]
