Reinforced isolated window comparator with adjustable threshold and latch function

01-02-2023 | Texas Instruments | Power

The Texas Instruments AMC23C12 is an isolated window comparator with a short response time. The open-drain output is detached from the input circuitry by an isolation barrier highly resistant to magnetic interference. This barrier is certified to deliver reinforced galvanic isolation of up to 5kV RMS according to VDE 0884-17 and UL1577 and supports a working voltage of up to 1kVPK.

The comparison window is centred around 0V, meaning that the comparator trips if the absolute value of the input voltage overreaches the trip threshold value. The trip threshold is adaptable from 20mV to 300mV through a single external resistor; therefore, the comparison window ranges from ±20mV to ±300mV. When the voltage on the REF pin is greater than 550mV, the negative comparator is disabled, and only the positive comparator is functional. The reference voltage in this mode may be as high as 2.7V. This mode is useful for monitoring voltage supplies.

The open-drain output on the comparator supports transparent mode (LATCH input tied to GND2), where the output tracks the input state, or latch mode, where the output is cleared on the falling edge of the latch input signal.

The device is provided in an eight-pin, wide-body SOIC package and is specified over the extended industrial temperature range of 40C to +125C.

By Seb Springall