This document describes the UC3702 Quad Relay Driver product, including the features of the product, such as maintaining a constant average relay voltage, VBUS voltage up to 42.5V, up to 50mA per relay, integrated Schottky flyback diodes, independent relay control inputs, short circuit protection, user-selectable operating center frequency and relay voltage, and global reset.
The document describes the Unitrode UC1702/UC2702/UC3702 family of Quad PWM Relay Drivers. These integrated circuits are designed to drive up to four relays from logic inputs using an unregulated relay voltage supply in a power-efficient manner. The devices maintain a constant average relay voltage despite varying supply voltages and include features such as short circuit protection, global reset, and internal Schottky flyback diodes.
| Supply Voltage (VCC) | 4.5 to 8 V |
|---|---|
| VBUS Supply Voltage | 42.5 V |
| Average Current per Relay | 50 mA |
| Short Circuit Current | 100 to 175 mA |
The device requires a +5V logic supply as a reference.
Yes, short circuit protection is provided on chip with periodic retry.