Diodes AP3108L＋APR346 45W USB PD 3.0适配器解决方案

Diodes公司的45W USB PD 3.0适配器包括三个主要部分: AP3108L提供DCM/CCM PWM开关, APR346同步整流控制器和CY2311_16L USB 3.0协议译码器,采用带光耦合的SSR拓扑结构, USB PD 3.0兼容,满足DOE 6和CoC Tier 2效率规范,无负载待机功耗小于30mW,输入电压90VAC-264VAC,输出5V/3A,9V/3A,12V/3A,15V/3A和20V/2.25A,效率89%,总输出功率45W.主要用在USB PD 3.0墙适配器和USB PD 3.0汽车充电器.本文介绍了AP3108L, APR346, CY2311_16L主要特性,框图,应用电路以及45W USB PD 3.0适配器评估板主要特性,电路图,材料清单和变压器设计指标以及PCB设计图.

The AP3108L is a Current Mode PWM controller specially designed for offline power supply that requires ultra-low standby power, high-power density and comprehensive protection. The AP3108L coordinating with Diodes’ secondary side controller, such as the AP4320, can be applied in the situation that requires for constant CC and constant CV.

The maximum switching frequency of the AP3108L is set at 65kHZ. The switching frequency can be modulated through green mode, in which it will smoothly decrease along with the decreasing load. This will cause the minimum switching frequency to be clamped at about 22kHz to avoid audible noise.

The AP3108L provides an inner high-voltage start-up function through HV pin which can save the use of the external start-up resistor, reducing the standby loss. The HV pin also realizes X-CAP discharge function. This is a useful function for power saving when an X-CAP is connected to a system, for it will discharge the X-CAP when the AC line voltage is off automatically without the need for extra discharge resistors.

The AP3108L integrates a VCC LDO circuitry, allowing the LDO to regulate the wide range VCC_IN, which is rectified from auxiliary winding to an acceptable value. This makes the AP3108L a good choice in wide range output voltage application.

There are also versatile system protections provided by AP3108L, such as secondary side OVP, secondary side UVP, constant outp...