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MID400 AC Line Monitor Logic-Out Device
September 2016
MID400
AC Line Monitor Logic-Out Device
Features
• Direct operation from any line voltage with the use of
an external resistor.
• Externally adjustable time delay
• Externally adjustable AC voltage sensing level
• Logic level compatibility
• Safety and Regulatory Approvals:
– UL1577, 2,500 VAC
RMS
for 1 Minute
– DIN-EN/IEC60747-5-5, 630 V Peak Working
Insulation Voltage
Description
The MID400 is an optically isolated AC line-to-logic inter-
face device. It is packaged in an 8-lead plastic DIP. The
AC line voltage is monitored by two back-to-back GaAs
LED diodes in series with an external resistor. A high
gain detector circuit senses the LED current and drives
the output gate to a logic low condition.
The MID400 has been designed solely for the use as an
AC line monitor. It is recommended for use in any AC-to-
DC control application where excellent optical iso- lation,
solid state reliability, TTL compatibility, small size, low
power, and low frequency operations are required.
Applications
• Monitoring of the AC/DC “line-down” condition
• “Closed-loop” interface between electromechanical
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