UC1872
UC2872
UC3872
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these parameters apply for TJ = −55°C to +125°C for the
UC1872, –40°C to +85°C for the UC2872, −0°C to +70°C for the UC3872; VCC= 5V, VC = 15V, VENBL = 5V, CT = 1nF, ZD = 1V.
PARAMETER
Error Amp Section (cont.)
Output Low
TEST CONDITIONS
MIN
TYP
MAX UNITS
V
INV = 1.7V
0.1
0.2
V
µA
Output Source Current
Output Sink Current
VINV = 1.3V, VO = 2V
VINV = 1.7V, VO = 2V
–350 –500
10
0
20
1
mA
V
Common Mode Range
Unity Gain Bandwidth
Open Lamp Detect Section
Soft Start Threshold
Open Lamp Detect Threshold
Soft Start Current
VIN-1V
TJ = 25°C (Note 4)
MHz
V
INV = 0V
2.9
0.6
10
3.4
1.0
20
3.8
1.4
40
V
V
VSS = 4.2V
VSS = 2V
µA
Output Section
Output Low Level
IOUT = 0, Outputs A and B
IOUT = 10mA
0.05
0.1
0.2
0.4
2.2
V
V
IOUT = 100mA
1.5
V
Output High Level
IOUT = 0, Output C
IOUT = −10mA
13.9
13.5
12.5
14.9
14.3
13.5
30
V
V
IOUT = −100mA
V
Rise Time
TJ = 25°C, Cl = 1nF (Note 4)
TJ = 25°C, Cl = 1nF (Note 4)
80
80
ns
ns
Fall Time
30
Output Dynamics
Out A and B Duty Cycle
Out C Max Duty Cycle
Out C Min Duty Cycle
Under Voltage Lockout Section
Startup Threshold Voltage
Hysteresis
48
49.9
50
0
%
%
%
VINV = 1V
VINV = 2V
100
3.7
4.2
4.5
V
120
200
280
mV
Enable Section
Input High Threshold
Input Low Threshold
Input Current
2
V
V
0.8
VENBL = 5V
150
400
µA
Supply Current Section
VCC Supply Current
VC Supply Current
ICC Disabled
VCC = 24V
6
5
1
14
12
10
mA
mA
µA
VC = 24V
VCC = 24V, VENBL = 0V
Note 3: Unless otherwise specified, all voltages are with respect to ground. Currents are positive into, and negative out of the
specified terminal.
Note 4: Guaranteed by design. Not 100% tested in production.
3
TI [ TEXAS INSTRUMENTS ]
