8.2.3 Application Curves

One important aspect of power-stage design is the effective detection of an overcurrent condition to protect the

switching devices and passive components from damage. To power off the system quickly in the event of an

overcurrent condition, a low delay caused by the isolated amplifier is required. Figure 8-4 shows the typical

full-scale step response of the AMC0x00R.

0

5

10

15

20

25

30

35

40

45

50

Time (µs)

0

0.5

1

1.5

2

2.5

3

3.5

4

VINP

VREFIN

VOUT

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0.4

0.5

G087

Figure 8-4. Output Step Response of the AMC0x00R

Figure 8-5 shows the typical step response of the AMC0x00R when a transient step is applied on its reference

input pin with INP and INN connected to GND1.

0

5

10

15

20

25

Time (µs)

-0.5

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

5.5

VOUT

VREFIN

G082

Figure 8-5. Reference Input Step Response of the AMC0x00R

8.3 Best Design Practices

Place a minimum 10nF capacitor at the device input (from INP to INN). This capacitor helps avoid voltage droop

at the input during the sampling period of the switched-capacitor input stage.

Do not short GND1 to INN directly at the device input. For best accuracy, route the ground connection as a

separate trace that connects directly to the shunt resistor. See the Layout Example section for more details.

Do not leave the inputs of the AMC0x00R unconnected (floating) when the device is powered up. If the device

inputs are left floating, the input bias current potentially drives the inputs to a positive value that exceeds the

operating common-mode input voltage. This condition causes the device to output the fail-safe voltage described

in the Analog Output section.

Connect the high-side ground (GND1) to INN, either by a hard short or through a resistive path. A DC current

path between INN and GND1 is required to define the input common-mode voltage. Do not exceed the input

common-mode range specified in the Recommended Operating Conditions table.

AMC0300R, AMC0200R

SBASAR9 – DECEMBER 2025

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