English
Language : 

U4793B Datasheet, PDF (1/6 Pages) TEMIC Semiconductors – Overload Monitoring with Resistive Load, VT = 44.5 mV
Features
• 10 kV – ESD Protection
• Two Comparators with Common Reference
• Tight Threshold Tolerance
• Constant Threshold
• NPN Output
• Interference and Damage-protection According to VDE 0839 and ISO/CD 7637
• EMI Protection
• Reversal Polarity Protection
• Load-dump Protection
Description
The bipolar U4793B is designed to monitor overload or a short circuit in automotive or
industrial applications. The threshold is tied to V4,6 = VS - VT where VT = 44.5 mV. It is
independent of the supply voltage, VS. If the voltage drop across shunt resistor, Rsh,
exceeds this value, the output is turned on, otherwise the output is turned off.
Without supply voltage or open input Pin 8, the output is turned off. The output break-
down voltage is determined by the Z-diodes Z3 and Z5 with a typical value of VZ = 22 V.
An unused comparator input must be connected to Pin 7.
Current Monitor
IC
U4793B
Block Diagram
Figure 1. Schematic and Application Circuit
VS
2
7
R
sh
Z2
+
&
-
4
Rsh
8
0.6 VS
-
+
+
-
&
6
Load
1
R1 150 W
VBatt
5 OUT1
Z5
3 OUT2
Z3
Rev. 4557A–AUTO–11/02
1