TI AMC22C12DR

The AMC22C12 is an isolated window comparator with a short response time. The open-drain output is separated from the input circuitry by an isolation barrier that is highly resistant to magnetic interference. This barrier is certified to provide galvanic isolation of up to 3 kV RMS according to DIN EN IEC 60747-17 (VDE 0884-17) and UL1577, and supports a working voltage of up to 560 V RMS. The comparison window is centered around 0 V, meaning that the comparator trips if the absolute value of the input voltage exceeds the trip threshold value. The trip threshold is adjustable from 20 mV to 300 mV through a single external resistor and, therefore, the comparison window ranges from ±20 mV to ±300 mV. When the voltage on the REF pin is greater than 550 mV, the negative comparator is disabled and only the positive comparator is functional. The reference voltage in this mode can be as high as 2.7 V. This mode is particularly useful for monitoring voltage supplies. The open-drain output on the device supports transparent mode (LATCH input tied to GND2) where the output follows the input state, or latch mode, where the output is cleared on the falling edge of the latch input signal. The AMC22C12 is available in an 8-pin SOIC package and is specified over the extended industrial temperature range of -40°C to +125°C.

• Wide high-side supply range: 2 V to 27 V
• Low-side supply range: 2.7 V to 5.5 V
• Adjustable threshold:
  • Window-comparator mode: ±20 mV to ±300 mV
  • Positive-comparator mode: 600 mV to 2.7 V
• Reference for threshold adjustment: 100 μA, ±1%
• Trip threshold error: ±1% (max) at 250 mV
• Open-drain output with optional latch mode
• Propagation delay: 280 ns (typ)
• High CMTI: 55 V/ns (min)
• Safety-related certifications: 4250-VPK basic isolation per DIN EN IEC 60747-17 (VDE 0884-17); 3000-VRMS isolation for 1 minute per UL1577
• Fully specified over the extended industrial temperature range: -40°C to +125°C

• Overcurrent or overvoltage detection in motor drives
• Overcurrent or overvoltage detection in frequency inverters
• Overcurrent or overvoltage detection in solar inverters
• Overcurrent or overvoltage detection in DC/DC converters