65W PD fast charging solution based on ST VIPERGAN65

PD fast charging has become very popular in daily life, ST introduced the built-in gallium nitride (GAN) MOS compact control chip, the size of only 5 * 6mm, operating frequency up to 240K, ideal for PD fast charging and compact power supply.

VIPERGAN65 Introduction:

VIPERGAN65 is a high-voltage converter, built-in gallium nitride MOS (Gan MOS ), designed for medium power quasi-resonant flyback converter design, can provide up to 65W output power in a wide range. A low static power management function is used to achieve low standby power consumption. Feedforward compensation enables consistent maximum output peak power region over the full voltage range.

VIPERGAN65 also provides protection functions that can significantly improve product safety and reliability: OVP, OTP, OLP.Brown-in, Brown-out, and input overvoltage protection (iOVP). All protections are in automatic restart mode.

65W Program Description:

This program is designed for 65W PD fast charging, using flyback topology, operating in QR mode, can effectively improve efficiency, the primary side of the main control chip using ST VIPERGNA65, the secondary side of the synchronous rectifier controller using ST SRK1001, the protocol chip using ST STUSB476QTR , the output interface for the mainstream USB Type-C.

The schematic diagram is as follows:

Transformer using RM10 core, the initial stage turns ratio of 6, inductance 500uH. Transformer structure diagram as follows:

►Scene application diagram

►Display board photo

►Solution square diagram

►Core Technology Advantage

65W DEMO Board Advantages:

• Average efficiency at 4 power points: >92%
• - No-load standby power consumption power consumption: <50 mW (@230 VAC)
• - EMI compliant with IEC55022 B
• - VIPERGAN65 integrated 650V Gallium Nitride MOS (GaN) for compact, simplified PCB layout and reduced BOM
• -QR with dynamic fade time and adjustable valley synchronization delay to maximize efficiency at any input line and load condition
• -Valley lock
• -Input voltage feedforward compensation OPP 
• -Frequency jitter suppresses EMI

►Specifications

65W DEMO Board Specifications:

-Input voltage: 90 ---264 VAC, frequency 47 ---63 Hz

-Output voltage: Single Type_C output 5 V ---20 VDC

-Output power: Maximum 20 V 3.25 A@ 65 W

-Dimensions: 70 x 35 x 25 mm (LxWxH)

-Power density: >22 W/in3

-Efficiency: meets EU CoC Tier 2 and DoE Level 6 efficiency requirements, peak efficiency >93% at 230 VAC 65W