Datasheet

ELECTRICAL CHARACTERISTICS
UC1903
UC2903
UC3903
www.ti.com ........................................................................................................................................ SLUS233A – OCTOBER 1999 – REVISED SEPTEMBER 2008
Unless otherwise stated, these specifications apply for T
A
= – 55 ° C to +125 ° C for the UC1903; – 40 ° C to +85 ° C for the
UC2903; and 0 ° C to +70 ° C for the UC3903; +V
IN
= 15V; Sense Inputs (Pins 6 – 9 and Pin 15) = 2.5V; V
PIN
4 = 1.0V, T
A
= T
J
.
UC1903 / UC2903 UC3903
PARAMETER TEST CONDITIONS UNIT
MIN TYP MAX MIN TYP MAX
SUPPLY
Input Supply Current No Faults 7 9 7 11 mA
UV, OV and Line Fault 10 15 10 18 mA
Supply Under Voltage Threshold Fault Outputs Enabled 6.0 7.0 7.5 5.5 7.0 8.0 V
(V
SUV
)
Minimum Supply to Enable Power 3.0 4.0 3.0 4.0 V
OK Output
REFERENCE
Output Voltage (V
REF
) T
J
= 25 ° C 2.485 2.5 2.515 2.470 2.5 2.530 V
Over Temperature 2.465 2.535 2.465 2.535 V
Load Regulation IL = 0 to 10mA 1 10 1 15 mV
Line Regulation +V
IN
= 8 to 40V 1 4 1 8 mV
Short Circuit Current TJ = 25 ° C 40 40 mA
FAULT THRESHOLDS
(1)
OV Threshold Adj. Offset from V
REF
as a function of V
PIN
0.230 0.25 0.270 0.230 0.25 0.270 V/V
4 Input = Low to High, 0.5V ≤ V
PIN
4 ≤ 2.5V
UV Threshold Adj. Offset from V
REF
as a function of V
PIN
– 0.270 – 0.25 – 0.230 – 0.270 – 0.25 – 0.270 V/V
4 Input = High to Low, 0.5V ≤ V
PIN
4 ≤ 2.5V
OV & UV Threshold Hyst. 0.5V ≤ V
PIN
4 ≤ 2.5V 10 20 30 10 20 30 mV/V
OV & UV Threshold Supply +V
IN
= 8V to 40V 0.002 0.01 0.002 0.02 %/V
Sensitivity
Adjust Pin (Pin 4) Input Bias Current 0.5V ≤ VP
IN
4 ≤ 2.5V ± 1 ± 10 ± 1 ± 12 µ A/V
Line Sense Threshold Input = High to Low 1.94 2.0 2.06 1.9 2.0 2.1 V
Line Sense Threshold Hyst. 125 175 225 100 175 250 mV
SENSE INPUTS
Input = 2.8V
(2)
1 3 1 6 µ A
Sense 1-4 Input Bias Current
Input = 2.2
(2)
– 1 – 3 – 1 -6 µ A
Line Sense Input Bias Current Input = 2.3V
(2)
1 3 1 6 µ A
OV AND UV FAULT DELAY
Charging Current 60 60 µ A
Threshold Voltage Delay Pin = Low to High 1.8 1.8 V
Threshold Hysteresis T
J
= 25 ° C 250 250 mV
Delay Ratio of Threshold Voltage to Charging 20 30 50 20 30 50 ms/ µ F
Current
(1) Reference to pin numbers in this specification pertain to 18 pin DIL N and J packages and 18 pin SOIC DW package.
(2) These currents represent maximum input bias currents required as the sense inputs cross appropriate thresholds.
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Product Folder Link(s): UC1903 UC2903 UC3903