
H
I G H
- S
P E E D
C
U R R E N T
-M
O D E
PWM
N
O T
R
E C O M M E N D E D
F O R
N
E W
D
E S I G N S
SG1825C/SG2825C/SG3825C
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
Copyright 1994
Rev. 1.3 6/96
4
E L E C T R I C A L C H A R A C T E R I S T I C S
(Cont'd.)
Parameter
Symbol
Test Conditions
Error Amplifier Section
(Note 6)
Input Offset Voltage
Input Bias Current
Input Offset Current
DC Open Loop Gain
Common Mode Rejection
Power Supply Rejection
Output Sink Current
Output Source Current
Output High Voltage
Output Low Voltage
Unity Gain Bandwidth (Note 3)
Slew Rate (Note 3)
PWM Comparator Section
(Note 5 & 7)
Ramp Input Bias Current
Minimum Duty Cycle
Maximum Duty Cycle (Note 8)
Zero Duty Cycle Threshold
Delay to Driver Output (Note 3)
Softstart Section
C
SS
Charge Current
C
SS
Discharge Current
Current Limit / Shutdown Section
(Note 9)
I
LIM
Input Bias Current
Current Limit Threshold
Shutdown Threshold
Delay to Driver Output (Note 3)
Output Drivers Section (each output)
Output Low Level
R
S
≤
2K
, V
ERROR
= 2.5V
V
ERROR
= 2.5V
V
ERROR
= 2.5V
V
ERROR
= 1 to 4V
Over Rated Voltage Range, V
ERROR
= 2.5V
V
IN
= 10V to 30V, V
ERROR
= 2.5V
V
ERROR
= 1V
V
ERROR
= 4V
I
ERROR
= -0.5mA
I
ERROR
= 1mA
A
VOL
= 0dB
A
VOL
V
ERROR
= 1V
V
ERROR
= 4V
V
RAMP
= 0V to 2V, V
ERROR
= 2V
V
SOFTSTART
= 0.5V
V
SOFTSTART
= 1.0V
V
SHUTDOWN
= 0V to 1.2V
I
SINK
= 20mA
I
SINK
= 200mA
I
SOURCE
= 20mA
I
SOURCE
= 200mA
V
C
= 30V
C
L
= 1000pF
Output High Level
V
C
Standby Current
Output Rise / Fall Time (Note 3)
Undervoltage Lockout Section
Start Threshold Voltage
UV Lockout Hysteresis
Supply Current Section
(Note 5)
Start Up Current
Operating Current
Note 5.F
OSC
= 400kHz (R
= 3.65k
, C
T
= 1.0nF).
Note 6.V
CM
= 1.5V to 5.5V.
Note 7.V
= 0V, unless otherwise specified.
Note 8.100% duty cycle is defined as a pulsewidth equal to one oscillator period.
Note 9. V(I
LIM
/S.D.) = 0V to 4.0V, unless otherwise specified.
V
IN
= 8V
V
INV
, V
RAMP
, V(I
LIM
/S.D.) = 0V, V
N.I.
= 1V
SG3825C
Units
Min. Typ. Max. Min. Typ. Max.
SG1825C/2825C
15
3
1
15
3
1
mV
μA
μA
dB
dB
dB
mA
mA
V
V
MHz
V/μsec
0.6
0.1
95
95
110
2.5
-1.3
4.7
0.5
5.5
0.6
0.1
95
95
110
2.5
-1.3
4.7
0.5
5.5
60
75
85
1
-0.5
4.0
0
3
6
60
75
85
1
-0.5
4.0
0
3
6
5.0
1.0
5.0
1.0
-1
-5
0
-1
-5
0
μA
%
%
V
ns
85
1.1
85
1.1
1.25
50
1.25
50
80
80
3
1
9
20
3
1
9
20
μA
mA
±15
1.1
±10
1.1
μA
V
V
ns
0.9
1.25 1.40 1.55 1.20 1.40 1.55
50
80
1.0
0.9
1.0
50
80
0.25 0.40
1.2
0.25 0.40
1.2
V
V
V
V
2.0
2.0
13.0 13.5
12.0 13.0
13.0 13.5
12.0 13.0
150
30
500
60
150
30
500
60
μA
ns
8.8
0.4
9.2
0.8
9.7
1.2
8.8
0.4
9.2
0.8
9.7
1.2
V
V
0.5
22
1.2
33
0.5
22
1.2
33
mA
mA