UC1904
UC2904
UC3904
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
OV UV Window, LS Input, OC Input, ARST Input, and
ON/OFF Input Thresholds (cont.)
Under-Voltage Threshold s W
ADJ
= 0.25V, Offset from V
REF,
Input H to L -140 -125 -110 mV
S1, S2 W
ADJ
= 0.5V, Offset from V
REF,
Input H to L -270 -250 -230 mV
W
ADJ
= 1V, Offset from V
REF,
Input H to L -540 -500 -460 mV
Under-Voltage Threshold s W
ADJ
= 0.25V, Offset from V
REF,
Input H to L -150 -125 -110 mV
S3, S4 Positive Mode W
ADJ
= 0.5V, Offset from V
REF,
Input H to L -285 -250 -230 mV
W
ADJ
= 1V, Offset from V
REF,
Input H to L -555 -500 -460 mV
OV and UV Threshold Hysteresis As a Function of W
ADJ
30 50 70 mV/V
S3 Negative Mode Thresholds Over-Voltage , W
ADJ
= 0.5V, Input H to L -13.52 -13.2 -12.88 V
Under-Voltage, W
ADJ
= 0.5V, Input L to H -11.06 -10.8 -10.54 V
Hysteresis, W
ADJ
= 0.5V 80 120 160 mV
S4 Negative Mode Thresholds Over-Voltage , W
ADJ
= 0.5V, Input H to L -5.63 -5.5 -5.37 V
Under-Voltage, W
ADJ
= 0.5V, Input L to H -4.61 -4.5 -4.39 V
Hysteresis, W
ADJ
= 0.5V 30 50 70 mV
W
ADJ
Input Bias Current 0.25V < W
ADJ
<1.0V -5 5
µ
A/V
LS Threshold Input = H to L 1.96 2 2.04 V
Threshold hysteresis 65 100 125 mV
OC Threshold Input = H to L 1.9 2 2.1 V
Threshold hysteresis 50 100 150 mV
ARST Input Threshold Input = L to H 2.25 2.5 2.75 V
Input = H to L 0.56 0.625 0.69 V
ON/OFF Input Threshold Input high level 1.74 2.4 V
Input low level 0.6 1.35 V
Sense and Logic Input Bias Currents
Sense 1-4, Positive Mode Input = 2.8V 250 800 nA
Input = 2.2V -1000 -250 nA
Sense 3 Negative Mode Input = -12V -700 -500 -300
µ
A
Sense 4 Negative Mode Input = -5V -700 -500 -300
µ
A
Line, and OC Inputs Input = 2.2V 300 1000 nA
ON/OFF Input In pu t = 2.5V 150 600 nA
ARST Input Input = 0.5 -2000 -700 nA
Open Collector Outputs (
OV/OC Out, PG Out, PWRW Out, ON/OFF Out)
Saturation Voltage I
OUT
= 10mA 0.2 0.4 V
Leakage current V
OUT
= 20V 5
µ
A
POR Delay
Delay 160 250 350 ms/µF
Internal Pullup Current 9
µ
A
Threshold Low to High 2.25 V
OFF Delay
Delay 120 185 250 ms/µF
Internal Pullup current 12
µ
A
Threshold Low to High 2.25 V
OV Fault Delay
Delay 10 20 50
µ
s
Unless otherwise stated, these specifications hold for T
A
= 0 to 70°C for the UC3904, -40 to
+85°C for the UC2904, and -55 to +1 25°C for the UC1904, +VIN = 15V, W
ADJ
= 0.5V, Sense
Inputs 1-4, OC and LS Inputs = 2.5V. The ON/OFF Input and the ARST Input = 0V.
ELECTRICAL
CHARACTERISTICS (cont):
3