原标题：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 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

　　· 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应用:

　　· Switching AC-DC Adapter/Charger

　　· Open Frame Switching Power Supply

　　图1. AP3108L框图

　　图2. AP3108L应用电路图

　　The APR346 is a secondary side MOSFET driver for synchronous rectification, supports CCM, DCM and Quasi-Resonant Flyback Topologies.

　　The synchronous rectification can effectively reduce the secondary side rectifier power dissipation and provide high performance solution. By sensing primary MOSFET gate-to-source voltage, the APR346 can output ideal drive signal with less external components. It can provide high performance solution for 5V to 20V output voltage application.

　　The APR346 is available in SOT26 package.

　　APR346主要特性:

　　· Synchronous Rectification for CCM, DCM Operation Flyback

　　· Eliminate Resonant Ring Interference

　　· Fewest External Components

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

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

　　APR346应用:

　　Adapters/Chargers for Cell/Cordless Phones, ADSL Modems, MP3 and Other Portable Apparatus

　　图3. APR346框图

　　图4. APR346应用电路图

　　45W USB PD 3.0适配器评估板EV1

　　The 45W USB PD 3.0 Adaptor Evaluation Board EV1 is composed of three main parts, AP3108L offers the DCM/CCM PWM switching, APR346 is a Synchronous Rectification Controller, and the CY2311_16L is USB 3.0 protocol decoder. Based on monitoring CC1 & CC2 signals, CY2311_16L interprets desired voltage and current setting, and then feedback information to primary side AP3108L controller for providing well regulated voltage and current as well as related power protections.

　　45W USB PD 3.0适配器评估板EV1主要特性:

　　系统特性:

　　· 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

　　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

　　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

　　CY2311_16L主要特性:

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

　　· USB PD2.0, PD 3.0 Protocol Decoding

　　· 10-Bit ADCs for voltage and current monitoring

　　· Built in Shunt Regulator for Constant Voltage and Constant Current

　　· 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 IC Compliance Certified – TID #1060013, 12/18/2017 (http://canyon-semi.com.tw/images/USB-IF_compliance_certification1211.pdf)

　　适配器评估板EV1应用:

　　· USB PD 3.0 Wall Adaptor

　　· USB PD 3.0 Car Charger

　　适配器评估板EV1主要指标(CV&CC模式)

　　图5. 适配器评估板EV1外形图(正面)

　　图6. 适配器评估板EV1外形图(背面)

　　主要指标和测试结果:

　　适配器评估板EV1材料清单:

　　变压器设计指标:

　　图8. 适配器评估板EV1 PCB设计图:左;顶层;右:底层