Product details


Topology Boost, Flyback, Forward Control method Current VCC (Min) (V) 11.3 VCC (Max) (V) 11 Duty cycle (Max) (%) 50 UVLO thresholds on/off (V) 11.3/8.3 Frequency (Max) (kHz) 1000 Operating temperature range (C) -40 to 85 Gate drive (Typ) (A) 1 Features Adjustable Switching Frequency, Error Amplifier, Leading Edge Blanking, Multi-topology, Programmable Max Duty Cycle, Soft Start, Synchronization Pin Rating Catalog open-in-new Find other PWM controllers & resonant controllers

Package | Pins | Size

PDIP (N) 16 181 mm² 19.3 x 9.4 SOIC (DW) 16 77 mm² 10.3 x 7.5 open-in-new Find other PWM controllers & resonant controllers


  • Single Oscillator Synchronizes Two PWMs
  • 150-µA Startup Supply Current
  • 2-mA Operating Supply Current
  • Operation to 1 MHz
  • Internal Soft-Start
  • Full-Cycle Fault Restart
  • Internal Leading-Edge Blanking of the Current Sense Signal
  • 1-A Totem Pole Outputs
  • 75-ns Typical Response from Current Sense to Output
  • 1.5% Tolerance Voltage Reference

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The UCC3810 is a high-speed BiCMOS controller integrating two synchronized pulse width modulators for use in off-line and dc-to-dc power supplies. The UCC3810 family provides perfect synchronization between two PWMs by usin g the same oscillator. The oscillator’s sawtooth waveform can be used for slope compensation if required.

Using a toggle flip-flop to alternate between modulators, the UCC3810 ensures that one PWM does not slave, interfere, or otherwise affect the other PWM. This toggle flip- flop also ensures that each PWM is limited to 50% maximum duty cycle, insuring adequate off-time to reset magnetic elements. This device contains many of the same elements of the UC3842 current mode controller family, combined with the enhancements of the UCC3802. This minimizes power supply parts count. Enhancements include leading edge blanking of the current sense signals, full cycle fault restart, CMOS output drivers, and outputs which remain low even when the supply voltage is removed.

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Technical documentation

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Type Title Date
* Datasheet Dual Channel Synchronized Current Mode PWM datasheet (Rev. D) Nov. 02, 2004

Design & development

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CAD/CAE symbols

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PDIP (N) 16 View options
SOIC (DW) 16 View options

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