6.4 Device Functional Modes

The AMC0380D operates in one of the following states:

• Off-state: The low-side supply (VDD2) is below the VDD2UV threshold. The device is not responsive. OUTP

and OUTN are in Hi-Z state. Internally, OUTP and OUTN are clamped to VDD2 and GND2 by ESD protection

diodes.

• Missing high-side supply: The low-side of the device (VDD2) is supplied and within recommended operating

conditions. The high-side supply (VDD1) is below the VDD1UV threshold. The device outputs the VFAILSAFE

voltage.

• Analog input overrange (positive full-scale input): VDD1 and VDD2 are within recommended operating

conditions but the analog input voltage VIN is above the maximum clipping voltage VClipping, MAX. The device

outputs positive VCLIPout.

• Analog input underrange (negative full-scale input): VDD1 and VDD2 are within recommended operating

conditions but the analog input voltage VIN is below the minimum clipping voltage VClipping, MIN. The device

outputs negative VCLIPout.

• Normal operation: VDD1, VDD2, and VIN are within the recommended operating conditions. The device

outputs a differential voltage that is proportional to the input voltage.

Table 6-1 lists the operating modes.

Table 6-1. Device Operational Modes

OPERATING

CONDITION

VDD1

VDD2

VIN

DEVICE

RESPONSE

Off

Don't care

VDD2 < VDD2UV

Don't care

OUTP and OUTN are in Hi-Z state. Internally,

OUTP and OUTN are clamped to VDD2 and

GND2 by ESD protection diodes.

Missing high-side

supply

VDD1 < VDD1UV

Valid(1)

Don't care

The device outputs the VFAILSAFE voltage.

Input overrange

Valid(1)

Valid(1)

VIN > VClipping, MAX

The device outputs positive VCLIPout.

Input underrange

Valid(1)

Valid(1)

VIN < VClipping, MIN

The device outputs negative VCLIPout.

Normal operation

Valid(1)

Valid(1)

Valid(1)

The device outputs a differential voltage that

is proportional to the input voltage.

(1)

Valid denotes operation within the recommended operating conditions.

7 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

7.1 Application Information

AC-line powered power supplies are divided into two or more voltage domains that are galvanically isolated

from each other. For example, the high-voltage domain includes the AC grid, DC link, and the power stage

for power-factor correction (PFC). The low-voltage domain includes the system controller and human interface.

The PFC controller measures the value of the AC line voltage while remaining galvanically isolated from the

AC mains for safety reasons. With the high-impedance input and galvanically isolated output, the AMC0380D

enables this measurement.

AMC0380D

SBASAT0 – SEPTEMBER 2025

www.ti.com

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