Product Summary

The MC3425P 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 MC3425P overvoltage channel has a high current Drive Output for use in conjunction with an external SCR Crowbar for shutdown. The MC3425P undervoltage channel input comparator has hysteresis which is externally programmable, and an open–collector output for fault indication.

Parametrics

MC3425P absolute maximum ratings: (1)Power Supply Voltag, VCC: 40 Vdc; (2)Comparator Input Voltage Range, VIR: –0.3 to +40 Vdc; (3)Drive Output Short Circuit Current, IOS(DRV): Internally Limited; (4)Indicator Output Voltage, VIND: 0 to 40 Vdc; (5)Indicator Output Sink Current, IIND: 30 mA; (6)Power Dissipation and Thermal Characteristics, Maximum Power Dissipation @ TA = 70℃, PD: 1000mW; Thermal Resistance, Junction–to–Air, RθJA: 80℃/W; (7)Operating Junction Temperature, TJ: +150℃; (8)Operating Ambient Temperature Range, TA: 0 to +70℃; (9)Storage Temperature Range, Tstg: –55 to +150℃.

Features

MC3425P features: (1)Dedicated Over and Undervoltage Sensing; (2)Programmable Hysteresis of Undervoltage Comparator; (3)Internal 2.5 V Reference; (4)300 mA Overvoltage Drive Output; (5)30 mA Undervoltage Indicator Output; (6)Programmable Time Delays; (7)4.5 V to 40 V Operation.

Diagrams

MC3425P Representative block diagram

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