Intelligent Multi-Mode Flyback Controller



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


HY1651 is an intelligent digital multi-mode Flyback controller with high voltage start up on chip. The newly developed architecture is inherent features to meet regulatory requirements of the industry.

HY1651 integrates rich protections and features such as line compensation, slope compensation, transformer short protection, output over-voltage protection, over-temperature protection, brown in and brown-out, sense resistor short protection.

HY1651 is available with the SOIC-7 package.


· On Chip High Voltage Start Up

· Intelligent Digital Multi-Mode Control

· Peak Current Mode Control at Burst-Mode


· Continuous-Conduction Mode (CCM) at Low Line (LL), QR at High Line (HL) to Balance the Switching Loss and the Conduction Loss

· Switching Frequency Dithering to Improve EMI

· Adaptive MOSFET Gate Drive to Balance Switching Loss and EMI

· MOSFET Gate Voltage is Clamped at 12V

· Protection Features

§ Output OVP


§ Transformer Saturation Protection

§ Current Sensor Resistor Short Protection

§ Over Load Protection

§ Brown Out/In Protection

§ On chip OTP

· Line Feed-forward Compensation

· Power Consumption < 20mW

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