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Atmel Electronic Components Datasheet

U4793B Datasheet

Current Monitor IC

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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
1. 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 = 22V.
An unused comparator input must be connected to pin 7.
Current Monitor
IC
U4793B
2. Block Diagram
Figure 2-1. Schematic and Application Circuit
VS
2
7
R
sh Z2
+
-
4
R
sh
8
0.6 VS
-
+
&
+
-&
6
Load
1
R1 150
VBatt
5 OUT1
Z5
3 OUT2
Z3
Rev. 4557B–AUTO–09/05


Atmel Electronic Components Datasheet

U4793B Datasheet

Current Monitor IC

No Preview Available !

3. Pin Configuration
Figure 3-1. Pinning DIP8/SO8
Table 3-1.
Pin
1
2
3
4
5
6
7
8
Pin Description
Symbol
GND
VS
OUT2
IN1
OUT1
IN2
VRef
Input switch
GND
VS
OUT2
IN1
1
2
3
4
8 Input switch
7 VRef
6 IN2
5 OUT1
Function
Reference point, ground
Supply voltage
Output 2
Input 1
Output 1
Input 2
Reference voltage
Input switch
2 U4793B
4557B–AUTO–09/05


Part Number U4793B
Description Current Monitor IC
Maker ATMEL
Total Page 8 Pages
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