Quad PWM Relay Driver

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 sec- tion concerning the relay selection.) VBUS must be higher then the rated relay voltage. Short Circuit Protection is provided on chip with periodic retry. The UC3702 requires a +5V Logic supply as a reference. Two external re- sistors program the effective relay voltage and a capacitor sets the nominal operating frequency. Internal Schottky Diodes eliminate the need for any external power components. In typical applications, the UC3702 grants the user the flexibility to choose the most cost effective relay without the added burden of generating a sep- arate relay supply voltage. The UC3702 will even function with a poorly regulated supply VBUS, containing significant 100Hz or 120Hz ripple. By Texas Instruments
UC1702 's PackagesUC1702 's pdf datasheet

UC1702 Pinout, Pinouts
UC1702 pinout,Pin out
This is one package pinout of UC1702,If you need more pinouts please download UC1702's pdf datasheet.

UC1702 Application circuits
UC1702 circuits
This is one application circuit of UC1702,If you need more circuits,please download UC1702's pdf datasheet.

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