Intelligent Multi-Mode Flyback Controller with GaN



Offline Charger
Programmable travel adapter
USB PD Charger
TV / Monitor Standby Power
Notebook Adapter


HYC3655 is an intelligent digital multi-mode Flyback controller integrated with 260mohm 650V GaN. The newly developed architecture is inherent features to meet regulatory requirements of the industry.  

HYC3655 integrates rich protections and features such as line compensation, slope compensation, transformer short protection, output over-voltage protection, VCC OVP, overload protection, over-temperature protection, brown in and brown-out.  

HYC3655 has 4 options:

HYC3655G/E: 89kHz switching frequency

HYC3655H: 130kHz switching frequency

HYC3655X: 200kHz switching frequency

HYC3655 is available with the DFN6x8 package.


· Integrated with 650V, 210mohm GaN FET

· Integrated with 650V high voltage start-up

· Intelligent Digital Multi-Mode Control

· Peak Current Mode Control at Burst-Mode /PFM/DCM/QR/CCM

· Switching Frequency Dithering to Improve EMI   

· GaN FET Gate Voltage is Clamped at 6.2V

· Protection Features  

§ Output OVP

§ Transformer Saturation Protection


§ Overload Protection

§ Brown Out/In Protection

§ On chip OTP

§ Limit Power Source (LPS) Protection

· Line Feed-forward Compensation

· Power Consumption < 20mW

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