U4793B_05 ATMEL [ATMEL Corporation], U4793B_05 Datasheet

U4793B_05

Manufacturer Part Number

U4793B_05

Description

Current Monitor IC

Manufacturer

ATMEL [ATMEL Corporation]

Datasheet

1.U4793B_05.pdf (8 pages)

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Features

•

1. Description

The bipolar U4793B is designed to monitor overload or a short circuit in automotive or

industrial applications. The threshold is tied to V

independent of the supply voltage, V

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 Z

An unused comparator input must be connected to pin 7.

2. Block Diagram

Figure 2-1.

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

Schematic and Application Circuit

Load

V S

0.6 V S

If the voltage drop across shunt resistor, R

R 1

and Z

4,6

150

= V

with a typical value of V

– V

where V

Z 5

Z 3

OUT1

OUT2

Batt

= 44.5 mV. It is

= 22V.

Current Monitor

U4793B

Rev. 4557B–AUTO–09/05

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