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MC3425 - POWER SUPPLY SUPERVISORY/ OVER AND UNDERVOLTAGE PROTECTION CIRCUIT

General Description

The MC3425 is a power supply supervisory circuit containing all the necessary functions required to monitor over and undervoltage fault conditions.

The block diagram is shown below in Figure 15.

Key Features

  • tDLY) is based on the constant current source, IDLY(source), charging the external delay capacitor (CDLY) to 2.5 V. Vref CDLY 2.5 CDLY = 12500 CDLY tDLY = = IDLY(source) 200 µA Figure 5 provides CDLY values for a wide range of time delays. The Delay pins are pulled low when the respective input comparator’s.

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Order this document by MC3425/D MC3425 Power Supply Supervisory/ Over and Undervoltage Protection Circuit The MC3425 is a power supply supervisory circuit containing all the necessary functions required to monitor over and undervoltage fault conditions. These integrated circuits contain dedicated over and undervoltage sensing channels with independently programmable time delays. The overvoltage channel has a high current Drive Output for use in conjunction with an external SCR Crowbar for shutdown. The undervoltage channel input comparator has hysteresis which is externally programmable, and an open–collector output for fault indication.