Diodes Corporation patented ACF topology solution for cost-effective and efficient implementation of key efficiency improvement methods, suitable for high-power density charger high-voltage startup and low standby power (<80mW), compliant with DOE VI and COC Tier 2 efficiency requirements USB Type-C port - Supports maximum output 140W PD3.1 function and AVS 28V with a step size of 100mV. It is implemented using SSR topology of optocoupler to achieve precise step voltage control and low overall system BOM cost.

The 140W ACF PD3.1 EPR (28V) evaluation board consists of three main controllers: AP3306, APR3401 and AP43771H. The AP3306 is a highly integrated active clamp flyback (ACF) controller designed for offline power supply, meeting ultra-low standby power, high power density and comprehensive protection requirements. The APR3401 is a secondary-side synchronous rectification (SR) controller. The AP43771H is a protocol decoder responsible for matching the associated charger capacity and requests through a connected USB Type-C® equipped charging device (DUC), regulating the charger's feedback network to meet the voltage and current requirements of the DUC. In addition, gallium nitride (GaN) FETs are used to further improve efficiency and thermal performance.

Our AC-DC solutions include chargers, adapters, home appliance power supplies, and USB PD decoders and receiver controllers. Most modern electronic devices require DC power to function properly. Typically, DC power comes from an AC power supply or a battery. Rechargeable batteries are charged via AC charger or adapter. Based on isolated flyback and non-isolated high voltage buck regulators for the high-volume market, we have developed a variety of high-efficiency and cost-effective AC-DC controllers, switches and related IC chips for primary-side applications. and secondary side adjustment. These regulators are suitable for a variety of power supply applications, including traditional chargers, fast chargers, small home appliances, mid-power set-top boxes and networking systems.

Scenario application diagram

Product entity diagram

Development board photos

Solusion diagram

Core technical

AP3306 main features:

1. Active clamp flyback topology with leakage energy recovery and zero-voltage switching functions

2. High voltage start-up Embedded VCC LDO for VCCL pin to ensure wide range output voltage

3. Maintain constant low output current in case of output short circuit

4. Silent noise quasi-resonance control

5. Soft start frequency foldback during startup to achieve high average efficiency

6. Secondary winding short-circuit protection with FOCP for reducing frequency jitter of EMI X-CAP discharge function

7. Useful Pin fault protection: SENSE pin floating protection/FB/optocoupler open circuit/short circuit protection

8. Comprehensive system protection functions: VOVP/OLP/BNO/SOVP/SSCP

APR3401 main features:

1. Synchronous rectification is suitable for DCM/QR/ACF operation mode

2. Eliminate resonant ringing interference

3. Use minimal external components

AP43771H main features:

1.Support USB PD Rev 3.1 OTP of MTP master firmware for system configuration

2. Operating voltage range: 3.3V to 28V Built-in voltage regulator for CV and CC control

3. Programmable OVP/UVP/OCP/OTP supports power saving mode

4.External N-MOSFET control for VBUS power supply

5.Support e-Marker cable detection W-DFN3030-14 package

Solution specifications

Main power supply specifications:

1. Input voltage: 90VAC~ 264VAC

2. Input standby power: < 80Mw

3. Main output: 5V/3A, 9V/3A, 15V/3A, 20V/3A, 28V/5A

4. Efficiency: Comply with CoC version 5 tier-2

5.Total output power: Total output power

6. Protection: OCP, OVP, UVP, OLP, OTP, SCP

7. Size: PCB: 84 * 55 * 23 mm3, and Case: 88 * 59 * 27 mm3

8. Power density index: 1W/CC