UC1825
UC2825
UC3825
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for , RT = 3.65k, CT = 1nF, VCC
= 15V, -55°C<TA<125°C for the UC1825, –40°C<TA<85°C for the UC2825, and 0°C<TA<70°C for the UC3825, TA=TJ.
UC1825
UC3825
PARAMETERS
TEST CONDITIONS
UC2825
MIN
TOP MAX
MIN
TOP MAX UNITS
PWM Comparator Section
Pin 7 Bias Current
Duty Cycle Range
Pin 3 Zero DC Threshold
Delay to Output*
VPIN 7 = 0V
-1
-5
-1
-5
µA
%
V
0
80
0
85
VPIN 7 = 0V
1.1
1.25
50
1.1
1.25
50
80
20
80
20
ns
Soft-Start Section
Charge Current
VPIN 8 = 0.5V
VPIN 8 = 1V
3
1
9
3
1
9
µA
Discharge Current
mA
Current Limit / Shutdown Section
Pin 9 Bias Current
Current Limit Threshold
Shutdown Threshold
Delay to Output
0 < VPIN 9 < 4V
15
1.1
1.55
80
10
1.1
1.55
80
µA
V
0.9
1.0
1.40
50
0.9
1.0
1.40
50
1.25
1.25
V
ns
Output Section
Output Low Level
IOUT = 20mA
IOUT = 200mA
IOUT = -20mA
IOUT = -200mA
VC = 30V
0.25
1.2
0.40
2.2
0.25
1.2
0.40
2.2
V
V
Output High Level
13.0
12.0
13.5
13.0
100
30
13.0
12.0
13.5
13.0
10
V
V
Collector Leakage
500
60
500
60
µA
ns
Rise/Fall Time*
CL = 1nF
30
Under-Voltage Lockout Section
Start Threshold
8.8
0.4
9.2
0.8
9.6
1.2
8.8
0.4
9.2
0.8
9.6
1.2
V
V
UVLO Hysteresis
Supply Current Section
Start Up Current
ICC
VCC = 8V
1.1
22
2.5
33
1.1
22
2.5
33
mA
mA
VPIN 1, VPIN 7, VPIN 9 = 0V; VPIN 2 = 1V
4
TI [ TEXAS INSTRUMENTS ]
