[原创] Diodes AP3108L+AP4377045W USB PD 3．0适配器解决方案

Diodes公司的45W USB PD 3.0适配器评估板由三部分组成:1)电流模式PWM控制器AP3108L,提供具有频率折回的DCM/CCM PWM开关,以提高效率;2)同步整流控制器APR346;3) USB Type-C供电控制器AP43770,它和USB Type-C规范发布1.3和USB供电(PD)规范Rev3.0 V1.2兼容. AP43770以20mV/步分辨率和50mA/步电流分辨率支持PPS APDO,用来电源管理.它也支持移动市场的高通快速充电4(Qualcomm Quick Charge 4).评估板满足DOE 6 和CoC Tier 2效率要求,无负载待机功耗小于30mW,主要用在USB PD 3.0墙上适配器和USB PD 3.0汽车充电器.本文介绍了AP3108L主要特性,功能框图表和典型应用电路,以及AP43770主要特性,功能框图表和典型应用电路.同时还介绍了45W USB PD 3.0适配器评估板EV2主要特性和电源指标,电路图,变压器指标和材料清单.

1.AP3108L

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.
..

查看全文