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The DIODES™ AP33510 is a highly integrated, quasi-resonant, flyback, GaN FET controller specially designed for offline flyback power supplies that require low standby power, high-power density, and comprehensive protection.
The controller operates in QR mode at full load. This makes switching events always occur in the drain-source valley, minimizing switching loss. The maximum switching frequency is internally limited to 150kHz. To ensure stable valley switching and prevent transformer audible noise caused by frequency hopping, the AP33510 features a proprietary valley-lockout technique inside.
When load decreases from full load, the IC will enter into PFM mode with frequency foldback for higher power conversion efficiency. At no load or light load, the controller will enter burst mode to minimize power consumption, and the minimum switching frequency (about 25kHz) is set to avoid any audible noise.
Piecewise linear line compensation ensures constant output power limit over an entire line voltage range.
To ensure converter ruggedness, the AP33510 implements comprehensive protective features such as brown-in/out detection, cycle-by-cycle current limiting, output OVP/UVP, overload protection, and overtemperature protection.
Up to 150kHz Quasi-Resonant Operation Mode for High Output Voltage
Halogen and Antimony Free. “Green” Device (Note 3)
For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/104/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative.