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UC3702 - Quad PWM Relay Driver

General Description

The UC3702 Quad Relay Driver is intended to drive up to four relays from logic inputs using an unregulated relay voltage supply.

The relays are driven from the Bus supply in a power efficient PWM converter fashion.

The relay coil is used as the inductive element.

Key Features

  • Maintains Constant Average Relay Voltage With Varying Supply Voltages.
  • VBUS Voltages up to 42.5V.
  • Up to 50mA per Relay.
  • Integrated Schottky Flyback Diodes.
  • Individual Relay Control Inputs.
  • Short Circuit Protection.
  • User Selectable Operating Center Frequency and Relay Voltage.
  • Global Reset.

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Datasheet Details

Part number UC3702
Manufacturer Unitrode
File Size 162.22 KB
Description Quad PWM Relay Driver
Datasheet download datasheet UC3702 Datasheet

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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UC1702 UC2702 UC3702 Quad PWM Relay Driver FEATURES • Maintains Constant Average Relay Voltage With Varying Supply Voltages • VBUS Voltages up to 42.5V • Up to 50mA per Relay • Integrated Schottky Flyback Diodes • Individual Relay Control Inputs • Short Circuit Protection • User Selectable Operating Center Frequency and Relay Voltage • Global Reset DESCRIPTION The UC3702 Quad Relay Driver is intended to drive up to four relays from logic inputs using an unregulated relay voltage supply. The relays are driven from the Bus supply in a power efficient PWM converter fashion. The relay coil is used as the inductive element. (See the application's section concerning the relay selection.) VBUS must be higher then the rated relay voltage.