AMC0X06M05 datasheet(32/47 Pages) TI2

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8.2.1 Design Requirements

Table 8-1 lists the parameters for this typical application.

Table 8-1. Design Requirements

PARAMETER

VALUE

High-side supply voltage

3.3V or 5V

Low-side supply voltage

3.3V or 5V

Voltage drop across RSHUNT for a linear response

±50mV(maximum)

8.2.2 Detailed Design Procedure

In the Typical Application figure, the high-side power supply (VDD1) for the AMC0x06M05 is derived from the

floating power supply of the upper gate driver.

The floating ground reference (GND1) is derived from the end of the shunt resistor that is connected to the

negative input of the AMC0x06M05 (INN). If a four-pin shunt is used, the inputs of the AMC0x06M05 are

connected to the inner leads. GND1 is then connected to the outer lead on the INN-side of the shunt. To

minimize offset and improve accuracy, route the ground connection as a separate trace that connects directly to

the shunt resistor. Do not short GND1 to INN directly at the device input; see the Layout Example section for

more details.

Use Ohm's Law to calculate the voltage drop across the shunt resistor (VSHUNT) for the desired measured

current:

VSHUNT = I × RSHUNT

(2)

Select a RSHUNT value to satisfy the following two conditions:

• First, the voltage drop caused by the nominal current range does not exceed the recommended differential

input voltage range of VSHUNT ≤ ±50mV.

• Secondly, the voltage drop caused by the maximum allowed overcurrent does not exceed the input voltage

that causes a clipping output. Keep VSHUNT ≤ VClipping.

AMC0206M05, AMC0306M05

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AMC0X06M05 Datasheet(PDF) 32 Page - Texas Instruments