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UC3702

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 Cen...

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UC3702: 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• ...

UC3702 Data Sheet

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Part Number:
UC3702
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/11/22

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Product Details

Description



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


Pinout

Connection Diagram


Specifications

VBUS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +50V
VCC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +9V
Input Voltage . . . . . . . . . . . . . . . . . . . . . .0.3V to VCC + 0.3V
Average Current per Relay. . . . . . . . . . . . . . . . . . . . . . . . 50mA
Total Output Capacitance. . . . . . . . . . . . . . . . . . . . . . . . . 25pF
Storage Temperature . . . . . . . . . . . . . . . . 65°C to +150°C
Junction Temperature. . . . . . . . . . . . . . . . .55°C to +150°C
Lead Temperature (Soldering, 10 sec.) . . . . . . . . . .. . +300°C

Currents are positive into, negative out of the specified terminal.Consult Packaging Section of Databook for thermal limitations and considerations of packages.



Description

The UC3702 Quad Relay Driver is intended to drive up to four relays from ogic inputs using an unregulated relay voltage supply. The relays are riven from the Bus supply in a power efficient PWM converter fashion. he relay coil is used as the inductive element. (See the application's section oncerning the relay selection.) VBUS must be higher then the rated elay voltage. Short circuit protection is provided on chip with periodic retry.

The UC3702 requires a +5V logic supply as a reference. Two external resistors rogram the effective relay voltage and a capacitor sets the nominal perating frequency. Internal Schottky diodes eliminate the need for any xternal power components.

In typical applications, the UC3702 grants the user the flexibility to choose he most cost effective relay without the added burden of generating a separate elay supply voltage. The UC3702 will even function with a poorly egulated supply VBUS, containing significant 100Hz or 120Hz ripple.




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