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