Datasheet

UCC28050, UCC28051
UCC38050, UCC38051
SLUS515F−SEPTEMBER 2002 − REVISED MARCH 2009
4
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ELECTRICAL CHARACTERISTICS
T
A
= 0_C to 70_C for the UCC3805x, –40_C to 105_C for the UCC2805x, T
A
= T
J
, V
CC
= 12 V.
supply
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
V
CC
operating voltage 18
V
Shunt voltage I
VCC
= 25 mA 18 19 20
V
Supply current, off V
CC
= V
CC
turn−on threshold –300 mV 75 125 μA
Supply current, disabled VO_SNS = 0.5 V 2 4
Supply current, on 75 kHz, C
L
= 0 nF 4 6
mA
Supply current, dynamic operating 75 kHz, C
L
= 1 nF 5 7
mA
UVLO
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
V turn on threshold
UCCx8050 15.4 15.8 16.4
V
CC
turn-on threshold
UCCx8051 12.0 12.5 13.0
V
CC
turn-off threshold 9.4 9.7 10.0
V
UVLO hysteresis
UCCx8050 5.8 6.3 6.8
V
UVLO hysteresis
UCCx8051 2.3 2.8 3.3
voltage amplifier (VO_SNS)
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Input voltage (V )
UCC3805x 2.46 2.50 2.54
V
Input voltage (V
REF
)
UCC2805x 2.45 2.50 2.55
V
Input bias current 0.5 μA
V
COMP
high VO_SNS = 2.1 V 4.5 5.5
V
V
COMP
low VO_SNS = 2.55 V 1.80 2.45
V
g
M
T
J
= 25 _C, V
COMP
= 3.5 V
60 90 130 μS
Source current
UCCx8050 VO_SNS = 2.1 V, V
COMP
= 3.5 V −0.2 −1.0 mA
Source current
UCCx8051 VO_SNS = 2.1 V, V
COMP
= 2.5 V −200 −300 −400 μA
Sink current VO_SNS = 2.7 V V
COMP
= 3.5 V 0.2 1.0 mA
over voltage protection / enable
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Overvoltage reference
UCCx8050
VREF +
0.165
VREF +
0.190
VREF +
0.210
V
Overvoltage reference
UCCx8051
VREF +
0.150
VREF +
0.180
VREF +
0.210
V
Hysteresis
UCCx8050 175 200 225
mV
Hysteresis
UCCx8051 150 180 210
mV
Enable threshold
UCCx8050 0.62 0.67 0.72 V
Enable threshold
UCCx8051 0.18 0.23 0.28 V
Enable hysteresis 0.05 0.10 0.20 V
multiplier
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Multiplier gain constant (k) V
MULTIN
= 0.5 V, COMP = 3.5 V 0.43 0.65 0.87 1/V
Dynamic input range, V
MULTIN
INPUT 0 to 2.5 0 to 3.5 V
Dynamic input range, COMP INPUT 2.5 to 3.8 2.5 to 4.0 V
Input bias current, MULTIN 0.1 1.0 μA