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Introduction
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Hi, guys. Welcome back to ChargerLAB.
Many laptops are equipped with USB-C port and PD protocols nowadays.
But there're still many old power adapters that come with a DC connector.
Today, we gonna introduce this converter that can make full use of old power adapter with a DC connector.
It enables traditional power adapters to support a variety of fast charging protocols and can support 100W PD fast charging.
So, let me introduce it to you.

Bill of materials (BOM)
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Input & Output Capacitor: Chengxing (25V 470μF)
Master Control Chip: Sothchip SC8701
Buck-boost MOSFET: CR Micro HGQ65NE4A (45V, 5.2mΩ)
Protocol Chip: Ismartware SW2305
Output VBUS MOSFET: AOS