Datasheet
4
UC17131/2/3
UC27131/2/3
UC37131/2/3
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, CDEL = 10nF, VCC = 25V, CSL = GND, CSH = LS;
R
CSH
= 0.5Ω (Note 1); IN=0V (for OFF condition) and IN=5V (for ON condition); T
A
=T
J
.
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Reference
VREF 25°C 5.8 6 6.2 V
–55°C to 125°C 5.6 6 6.4 V
Line Regulation VCC = 8V to 64V 10 35 mV
Load Regulation 0 < I
REF < 8mA 10 50 mV
Short Circuit Current REF = 0V 20 35 mA
Input Comparator
Turn-On Threshold Voltage 2.7 3 3.3 V
Input Bias Current V
IN = 3.5V 5 µA
Hysteresis R
HYST = GND (Internally for X31, X33) 0.775 0.9 1.025 V
R
HYST = 96.67k for (X32) 30 mV
Output: High Side (UCX7133: CSH = LS and CSL = GND Internally; See Fig. 2a)
Rise Time (Off to On) R
LOAD
= 250Ω to GND 30 80 V/µs
Fall Time (On to Off) R
LOAD
= 250Ω to GND 30 80 V/µs
Output Short Circuit HS = 0.25Ω to GND 500 900 mA
Voltage Clamp LS–HS 67 72 77 V
Saturation Voltage 25°C, R
LOAD
= 100Ω to GND 1.2 V
–40°C, R
LOAD
= 100Ω to GND 1.3 V
–55°C, R
LOAD
= 100Ω to GND 1.4 V
Leakage Current 5 µA
Output: Low Side (UCX7131; CSH = VCC and CSL = HS Internally; See Fig. 2b)
Rise Time (On to Off) R
LOAD
= 250Ω to VCC, R
CSL
= 0.5Ω 15 50 V/µs
Fall Time (Off to On) R
LOAD
= 250Ω to VCC, R
CSL
= 0.5Ω 25 60 V/µs
Output Short Circuit LS = 0.25Ω to VCC 500 700 900 mA
Voltage Clamp LS–HS 67 72 77 V
Saturation Voltage 25°C, R
LOAD
= 100Ω to VCC, R
CSL
= 0.5Ω 1.2 V
–40°C, R
LOAD
= 100Ω to VCC, R
CSL
= 0.5Ω 1.3 V
–55°C, R
LOAD
= 100Ω to VCC, R
CSL
= 0.5Ω 1.4 V
Leakage Current 5 µA
VCC Fault Section
Output Turn-On Delay, t
D(ON)
Step VCC from 0V to 8V (See Fig. 3a) 9.5 11 13.5 ms
Output Turn-Off Delay, t
D(OFF)
Pulse VCC from 25V to VCC Turn-Off
Threshold
300 500 700 µs
VCC Turn-Off Threshold Pulse VCC Low 6.5 7 7.5 V
CDEL Section
V
CDEL_MAX
5.8 V
V
FAULT_H
4.9 V
V
FAULT_L
1.0 V
Overcurrent Fault Section (See Fig. 3c)
Short Circuit Turn-Off Delay, t
SC
Step I
LOAD:
0mA to 400mA 75 µs
Short Circuit Recovery Time, t
ROFF
I
LOAD
= 400mA, 100µs10ms
High Side Current Threshold, I
TH-H
R
CSH
= 0.5Ω 250 325 400 mA
Low Side Current Threshold, I
TH-L
R
CSL
= 0.5Ω 250 325 400 mA
Overcurrent Duty Cycle R
LOAD
= 0.25Ω to GND 0.6 0.8 1.0 %