1 Features

? Wide high-side supply range: 3 V to 27 V

? Low-side supply range: 2.7 V to 5.5 V

? Dual window comparator:

– Window comparator 1: ±20-mV to ±300-mV

adjustable threshold

– Window comparator 2: ±300-mV fixed threshold

? Supports positive-comparator mode:

– Cmp0: 600-mV to 2.7-V adjustable threshold

– Cmp2: 300-mV fixed threshold

– Cmp1 and Cmp3: Disabled

? Reference for threshold adjustment: 100 μA, ±2

? Trip threshold error: ±1 (max) at 250 mV

? Open-drain outputs

? Propagation delay: 280 ns (typ)

? High CMTI: 15 V/ns (min)

? Safety-related certifications:

– 7000-VPK reinforced isolation per DIN EN IEC

60747-17 (VDE 0884-17)

– 5000-VRMS isolation for 1 minute per UL1577

? Fully specified over the extended industrial

temperature range: –40°C to +125°C

2 Applications

? Overcurrent or overvoltage detection in:

– Motor drives

– Frequency inverters

– Solar inverters

– DC/DC converters

3 Description

The AMC23C14 is a dual, isolated window

comparator with a short response time. The opendrain

outputs are separated from the input circuitry

by an isolation barrier that is highly resistant to

magnetic interference. This barrier is certified to

provide reinforced galvanic isolation of up to 5 kVRMS

according to VDE 0884-17 and UL1577, and supports

a working voltage of up to 1 kVPK.

Both comparators have windows that are centered

around 0 V, meaning that the comparators trip if the

input exceeds the thresholds in a positive or negative

direction. One comparator has fixed thresholds of

±300 mV. The second comparator has adjustable

thresholds from ±20 mV to ±300 mV through a single

external resistor.

The AMC23C14 also supports a positive-comparator

only mode. When the voltage on the REF pin

greater than 550 mV, the negative comparators

are disabled and only the positive comparators are

functional. The reference voltage in this mode can be

as high as 2.7 V. This mode is particularly useful for

monitoring positive voltage supplies.

The AMC23C14 is available in an 8-pin, wide-body

SOIC package and is specified over the extended

industrial temperature range of –40°C to +125°C.