• 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
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 = 22V.
An unused comparator input must be connected to pin 7.
2. Block Diagram
Figure 2-1. Schematic and Application Circuit
R1 150 Ω