Single IC can produce isolated or non-isolated ±12V outputs

Single IC can produce isolated or non-isolated ±12V outputs

Linear Technology’s 560 VIN micropower no-opto isolated flyback converter with 630 V / 300 mA switch

Linear Tech’s LT8315 high voltage flyback converter with integrated 630 V / 300 mA switch needs no opto-isolator for regulation. It samples the output voltage from the isolated flyback waveform appearing across a third winding on the transformer. Its quasi-resonant boundary mode operation improves load regulation, reduces transformer size, and maintains high efficiency. At start-up, the LT8315 charges its INTVCC capacitor via a current source attached to the DRAIN pin. The current source turns off and the device draws its power from a third winding on the transformer during normal operation. It operates from a wide range of input supply voltages and can deliver up to 15 W of power. The LT8315 is available in a thermally enhanced 20-pin TSSOP package with four pins removed for high-voltage spacing.

A complete ±12V/50mA isolated flyback converter for a wide input range, 30V to 400V


  • Wide input voltage range: 18 V to 560 V
  • 630 V / 300 mA integrated power switch
  • No opto-isolator required for regulation
  • Quasi-resonant boundary mode operation
  • Constant-current and constant-voltage regulation
  • Low-ripple light load Burst Mode® operation
  • Low quiescent current: 70 μA
  • Programmable current limit and soft-start
  • TSSOP package with high-voltage spacing

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Mike is the founder and editor of, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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