SG1525A/SG1527A SERIES
ELECTRICAL CHARACTERISTICS (continued)
SG1525A/2525A
SG1527A/2527A
SG3525A
SG3527A
Parameter
Test Conditions
Units
Min. Typ. Max. Min. Typ. Max.
Oscillator Section (Note 4)
Initial Accuracy
TJ = 25°C
37.6 40 42.4 37.6 40 42.4 KHz
Voltage Stability
VIN = 8V to 35V
MIN ≤ TJ ≤ MAX
RT = 150KΩ, CT = 0.1µF
RT = 2KΩ, CT = 1nF
±0.3 ±1
±1
±3
±2
±6
150
%
%
Hz
KHz
mA
V
Temperature Stability (Note 3)
Minimum Frequency (Note 3)
Maximum Frequency (Note 3)
Current Mirror
±3
±6
150
350
1.7 2.0 2.2 1.7 2.0 2.2
3.0 3.5 3.0 3.5
350
IRT = 2mA
Clock Amplitude
Clock Width
TJ = 25°C
0.3 0.5 1.0 0.3 0.5 1.0
µs
Sync Threshold
1.2 2.0 2.8 1.2 2.0 2.8
V
Sync Input Current
Sync Voltage = 3.5V
1.0 2.5
1.0 2.5
mA
Error Amplifier Section (VCM = 5.1V)
Input Offset Voltage
Input Bias Current
Input Offset Current
DC Open Loop Gain
0.5
1
5
10
1
2
1
10
10
1
mV
µA
µA
dB
MHz
V
RL ≥10MΩ, TJ = 25°C
AV = 0dB, TJ = 25°C
60
1
75
2
0.2 0.5
60
1
75
2
0.2 0.5
Gain-Bandwidth Product (Note 3)
Output Low Level
Output High Level
3.8 5.6
3.8 5.6
V
Common Mode Rejection
Supply Voltage Rejection
V
CM = 1.5V to 5.2V
60
50
75
60
60
50
75
60
dB
dB
VIN = 8V to 35V
P.W.M. Comparator Section
Minimum Duty Cycle
Maximum Duty Cycle
V
V
COMP = 0.6V
COMP = 3.6V
0
0
%
%
V
45
0.6 0.9
49
45
0.6 0.9
49
Input Threshold (Note 4)
Zero Duty Cycle
Maximum Duty Cycle
3.3 3.6
3.3 3.6
V
Input Bias Current
.05 2.0
.05 2.0
µA
Soft-Start Section
Soft Start Current
Soft Start Voltage
V
SHUTDOWN = 0V
VSHUTDOWN = 2V
SHUTDOWN = 2.5V
25
50
0.4 0.6
0.4 1.0
80
25
50
0.4 0.6
0.4 1.0
80
µA
V
mA
Shutdown Input Current
V
Output Drivers Section (each transistor, VC = 20V)
Output High Level
ISOURCE = 20mA
ISOURCE = 100mA
18
17
19
18
18
17
19
18
V
V
Output Low Level
I
SINK = 20mA
ISINK = 100mA
COMP and VSS = High
0.2 0.4
0.2 0.4
V
V
V
µA
ns
ns
µs
2.2
8
1.0
7
1.0
7
2.2
8
Undervoltage Lockout
Collector Leakage (Note 5)
Rise Time
Fall Time
Shutdown Delay (Note 3)
V
6
6
VC = 35V
200
100 600
50 300
200
100 600
50 300
CL = 1nF, TJ = 25°C
CL = 1nF, TJ = 25°C
VSD = 3V, CS = 0, TJ = 25°C
0.5
20
0.2
14
0.2
14
0.5
20
Total Standby Current
Standby Current
VIN = 35V
mA
11/91 Rev 1.3 10/96
LINFINITY Microelectronics Inc.
Copyright 1996
11861 Western Avenue ∞ Garden Grove, CA 92841
(714) 898-8121 FAX: (714) 893-2570
3
∞