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UM0971 Datasheet(PDF) 22 Page - STMicroelectronics

Part # UM0971
Description  STEVAL-IHM031V1 low voltage three-phase inverter demonstration board
PDF  45 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM0971 Datasheet(HTML) 22 Page - STMicroelectronics

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UM0971
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Doc ID 17701 Rev 1
2.6.5
Overcurrent protection
A hardware overcurrent protection has been implemented through a comparator. The typical
transition speed under the 5 V supply is about 2 µs from 50 mV overdrive.
Figure 13.
Overcurrent protection circuit
With the resistor values actually used in the circuit schematic:
R1= 15 k
Ω, R2=3 kΩ and Rshunt=0.1 Ω
it results:
Equation 11
that fixes the overcurrent threshold peak value at 8.33 A.
Iower
current
5
R2
R1
R2
+
----------------------
1
Rshunt
--------------------
⋅⋅
=



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