UM0971 datasheet(20/45 Pages) 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

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20 / 45 page

Board description

UM0971

20/45

Doc ID 17701 Rev 1

Figure 12.

Single-shunt configuration

It is possible to calculate the voltage on the output of the op amp Vout as the sum of a bias

voltage, Vbias, and an amplification of voltage drop across the shunt resistor (G):

Equation 8

Where:

Equation 9

and:

Equation 10

With the resistor values actually used in the circuit schematic, we have:

●

R1= 1100

●

R2=1000

●

R3=18

●

R4=2700

●

r=1000

●

R=11900

Therefore getting:

●

Vbias=0.2219 V

●

G=6.2

Table 9 lists the involved jumpers and their positions for DC current reading configuration:

Vout

Vbias

Rshunt I

⋅

()

⋅

Vbias

----------------------

--------

----------------------

--------

⎝⎠

⎛⎞

⋅

----------------------------------------------------------------------

------------

⋅

R3 R4

⋅

----------------------

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