6.4 Device Functional Modes

The AMC23C10-Q1 is operational when the power supplies VDD1 and VDD2 are applied, as specified in the

Recommended Operating Conditions table.

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

With low response time, high common-mode transient immunity (CMTI), and a reinforced isolation barrier, the

AMC23C10-Q1 is designed to provide a fast and reliable compare function for high-voltage applications in harsh

and noisy environments.

7.2 Typical Application

7.2.1 Voltage Zero-Crossing Detection

In AC power-switching applications, closing the load switch during the zero-crossing of the AC line voltage

minimizes the inrush current during turn-on. Figure 7-1 shows the implementation of a solid-state relay based

on the TPSI3050-Q1 device. The TPSI3050-Q1 is an isolated switch driver with an integrated 10V gate supply.

The two external, back-to-back, n-type field effect transistor (NMOS) power switches are turned on when the

EN pin of the TPSI3050-Q1 is driven high. These power switches are turned off when the EN pin is low. In this

application, the AMC23C10-Q1 detects the zero crossing of the AC line voltage and gates the EN signal to the

TPSI3050-Q1. The high-side of the AMC23C10-Q1 is powered from the integrated 10V gate drive supply of the

TPSI3050-Q1. A separate power supply is not required for the high-side.

VSSP

VDD1

GND1

INP

INN

AMC23C10-Q1

VDD2

OUT2

OUT1

GND2

C1

100nF

C2

1µF

C3

100nF

C4

1µF

Low-side supply (3.3V or 5V)

AC Line voltage

to control logic or MCU (P/P)

R5

2.4M

C6

(optional)

VSSS

EN

VSSP

PXFR

VDDP

TPSI3050-Q1

VDRV

VDDH

VDDM

VSSS

LOAD

J1

J4

R4

10

D1

BAT54S-HF

GND

from control logic or MCU

D1A

D1B

Figure 7-1. Using the AMC23C10-Q1 for AC Voltage Zero-Crossing Detection in a Solid-State Relay (SSR)

The AC line voltage is clamped by R5 and two small-signal, antiparallel diodes to limit the voltage at the input

of the AMC23C10-Q1. Close to the zero crossing of the AC line voltage, neither diode conducts and the voltage

at the INP pin equals the AC line voltage. As illustrated in Figure 7-2, OUT1 (an open-drain output) toggles

from high-to-low during the rising zero-crossing event and from low-to-high during the falling zero-crossing event.

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AMC23C10-Q1

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