Diodes公司的45W USB PD 3.0適配器評估板由三部分組成：1）電流模式PWM控制器AP3108L，提供具有頻率折回的DCM/CCM PWM開關，以提高效率;2）同步整流控制器APR346;3） USB Type-C供電控制器AP43770，它和USB Type-C規范發布1.3和USB供電（PD）規范Rev3.0 V1.2兼容。 AP43770以20mV/步分辨率和50mA/步電流分辨率支持PPS APDO，用來電源管理。它也支持移動市場的高通快速充電4（Qualcomm Quick Charge 4）。評估板滿足DOE 6 和CoC Tier 2效率要求，無負載待機功耗小于30mW，主要用在USB PD 3.0墻上適配器和USB PD 3.0汽車充電器。本文介紹了AP3108L主要特性，功能框圖表和典型應用電路，以及AP43770主要特性，功能框圖表和典型應用電路。同時還介紹了45W USB PD 3.0適配器評估板EV2主要特性和電源指標，電路圖，變壓器指標和材料清單。

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.

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 output current limit， cycle-by-cycle current limit， brown-out protection， programmable external OTP， etc.

AP3108L主要特性：

? Current Mode Control

? High-Voltage Startup

? Embedded VCC LDO to Guarantee Wide Range Output Voltage

? Constant， Low Output Current in Output Short Situation

? Low VCC Charge Current Reduces Standby Power in Output Short Situation

? Non-Audible-Noise Green-Mode Control

? Internal Slope Compensation

? Soft Start During Startup Process

? Frequency Fold Back for High Average Efficiency

? Constant Over Current Protection（COCP）

? VCC Maintain Mode

? X-CAP Discharge Function

? Precise Secondary Side OVP and UVP

? Programmable External OTP

? Brown-Out Protection

? Overload Protection

? FOCP and SSCP Protection

? Useful Pin Fault Protection

? SSOP-9 （Type CJ） is Available

? Totally Lead-Free & Fully RoHS Compliant （Notes 1 & 2）

? Halogen and Antimony Free. “Green” Device （Note 3）

AP3108L應用：

? Switching AC-DC Adapter/Charger

? Open Frame Switching Power Supply

圖1.AP3108L典型應用電路

圖2. AP3108L功能框圖

2.AP43770

The AP43770 is a USB Type-C power delivery controller dedicated to power source applications with legacy capability. It is compliant with USB Type-C specification release 1.3 and USB power delivery （PD） specification Rev3.0 V1.2.

The AP43770 can support PPS APDO with 20mV/step resolution and 50mA/step current resolution for power management. In addition， it supports Qualcomm Quick Charge 4 for mobile market. What’s more， cable-loss compensation and SOP’command for e-Marker detection are embedded too.

In consideration of customer applications， the AP43770 supports options for non-PD protocols like BC 1.2， QC4/4+，QC3.0/QC2.0， and other legacy protocols with auto-detection. It maintains backwards compatibility with the existing environment. There are rich power-features embedded on the chip and they can be configured through CC channel.

AP43770主要特性：

? Compliant with USB PD Rev3.0 V1.2

? USB-IF PD3.0/PPS Certificated TID = 1090017

? Qualcomm QC4 and QC4+，QC3.0， QC2.0 Built-in

? Support VOUT 20mV/Step from 3.3V to 20V

? Support Current Limit 50mA/Step up to 6A

? OTP（One-Time-Programmable ） for Main Firmware

? MTP （Multi-Time-Programmable ） for System Configuration

? USB PD Transceiver with High Noise Immunity

? Built-In CC/CV Controller

? Support e-Marker Cable Detection

? Built-In VCONN Switch with OCP Protection

? Cable Compensation for Different Load Condition

? Programmable for Configuration through CC Line

? Support OCP/SCP/OTP/UVP with Auto-Restart

? Built-In 5V/1.8V LDO

? Low Standby Current ： 550μA

? Maximum 32V Input Voltage Rating

? Support Non-USB PD Protocol Options

? BC 1.2 Legacy Built-In

? TID（11090017） for USB PD 3.0 PPS Compliance Test

? Package： TSSOP-16

AP43770應用：

? AC Adapters

? Car Chargers

? USB PD Converter

? Power Hubs

? Power Banks

圖3.AP43770功能框圖

圖4. AP43770典型應用電路圖

45W USB PD 3.0適配器評估板EV2

The 45W USB PD 3.0 Adaptor Evaluation Board EV2 is composed of three main parts. The AP3108L offers DCM/CCM PWM switching with frequency fold-back for improving efficiency. The APR346 is a Synchronous Rectification Controller， and the AP43770T16 is a USB 3.0 protocol decoder which is based on monitoring CC1 & CC2 signals for interpreting desired voltage and current setting， and then feedback the information to primary side AP3108L controller to provide well regulated voltage and current as well as related power protections. The 45W USB PD 3.0 Power Brick board passed the USB IF Compliance Test （TID： 11090056）， at June 2018.

45W USB PD 3.0適配器評估板EV2主要特性：

1.1系統主要特性：

? SSR Topology Implementation with an Opto-coupler for Accurate Step Voltage Controlling

? USB PD 3.0 Compliance

? Meet DOE 6 and CoC Tier 2 Efficiency Requirements

? 《30mW No-Load Standby Power

1.2. AP3108L主要特性：

? Current Mode PWM Controller

? Frequency shift function changes frequency per line loading

? Frequency fold back for high average efficiency

? Integration of high-voltage start-up circuit to enable low standby power

? Integration of 100V LDO， X-cap discharge for minimal system BOM components

? Constant load output current during output short circuit

? Rich Protection Functions： Precise Secondary Side OVP， UVP， OLP， BNO，FOCP， SSCP， External Programmable OTP

1.3. APR346主要特性：

? Synchronous rectification operating at DCM， CCM and QR mode for flyback topology

? Eliminate Resonant Ringing Interference

? Fewest External Components used

1.4. AP43770T16-13主要特性：

? Type-C USB PD DFP （Downstream Facing Port）

? USB PD2.0， PD 3.0，PPS，QC4 Protocol Decoding

? 10-Bit DAC for Vbus 3 ~ 20 voltage and 7 bits DAC for current monitoring

? Built in shunt regulator for constant voltage and constant current

? Support E-marker cable detection

? Programmable OVP/UVP/OCP/OTP

? Internal Discharge MOS

? Internal Vbus Load Switch Driver

? 3V- 30V operation voltage without external regulator

? Package 16-Pin TSSOP

? USB PD 3.0 PPS IC Compliance Certified – TID #11090017， 07/12/2018

45W USB PD 3.0適配器評估板EV2應用：

? USB PD 3.0 Wall Adaptor

? USB PD 3.0 Car Charger

主要電源指標（CV&CC模式）：

圖5.45W USB PD 3.0適配器評估板EV2外形圖（正面）

圖6.45W USB PD 3.0適配器評估板EV2外形圖（背面）

圖7.45W USB PD 3.0適配器評估板EV2電路圖

45W USB PD 3.0適配器評估板EV2材料清單：

變壓器設計指標：

圖8.45W USB PD 3.0適配器評估板EV2 PCB布局圖：左：頂層;右：底層

圖9.樣板的連接圖