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[原创] Diodes AP3984高效率高性能开关电源解决方案

关键词:电源管理 开关电源 AC/DC转换器 AP3984

时间:2018-07-10 10:52:17       作者:Diodes       来源:中电网

Diodes公司的AP3984是具有更好转换效率,更高电压和电流精度和更好保护功能的开关电源控制器,内置了700V BJT,初级边控制省略了光耦器件,具有极好的瞬态特性,高压和超速起动,外接可调节输出电缆压降补偿,无负载功耗小于10mW,多种PWM/PFM模式改善了音频噪音和效率,主要用在充电器,ADSL适配器,家用电器和机顶盒以及PC辅助电源.本文介绍了AP3984主要特性,框图,应用电路以及极低待机功耗PSR开关的评估板AP3984 5V 1A EV1主要特性和指标,测试结果,电路图,材料清单和PCB设计图.

The AP3984 is a power switcher for power supplies with better conversion efficiency, better voltage & current accuracy, and improved protection functions. Typical applications include charger, adapter for ADSL, home appliance power supply and PC auxiliary power supplies. The AP3984 with built in BJT, regulates the output voltage and current in the primary side by piece-wise pulse frequency modulation (p-PFM) and primary current peak amplitude modulation (AM) in discontinuous conduction mode (DCM). The system operating frequency reduces linearly from heavy load to light load in each interval of the p-PFM, and operating frequency is fixed at medium load by varying primary current peak amplitude.

The AP3984 has good transient characteristics in combination with the secondary side IC like AP4341/AP43410. Typically, minimal voltage of 4.3V at PCB side can be achieved for dynamic test of 5V application system.

The AP3984 provides operating frequency dithering function to improve EMC performance of power supply. The AP3984 also has programmable cable voltage drop compensation function by external resistor.

The AP3984 is packaged in SO-7.

AP3984主要特性:

 Primary Side Control for Eliminating Opto-coupler
 Built-in 700V BJT
 Excellent Transient Characteristics
 High Voltage and Super-speed Start up
 External Adjustable Output Cable Voltage Drop Compensation
 Ultra-low No-load Power Consumption(<10mW)
 Multiple PWM/PFM Mode to Improve Audio Noise and Efficiency
 Valley-on for Higher Efficiency and Better EMI
 Multiple Protections:
 Over Voltage Protection (OVP)
 Output Short Circuit Protection (SCP)
 Over Temperature Protection (OTP)
 Totally Lead-free & Fully RoHS Compliant (Notes 1 & 2)
 Halogen and Antimony Free. “Green” Device (Note 3)

AP3984应用:

 Adapters
 Set Top Boxes
 Auxiliary Supplies
 Appliances


图1. AP3984框图

图2. AP3984+AP4341(5V/1A)应用电路图

图3. AP3984+AP43410(5V/1A)应用电路图

图4.采用AP3984的简化反激转换器电路图

极低待机功耗PSR开关的评估板AP3984 5V 1A EV1

The AP3984 stands out as an extremely low standby-power (<10mW) Primary Side Regulation (PSR) switcher for power supplies based on optimal cost-effectiveness, efficiency, Constant Voltage (CV) & Constant Current (CC) accuracy, and versatile protection functions.

The AP3984, with built-in Bipolar Junction Transistor (BJT), regulates the output voltage and current in the primary side by piece-wise Pulse Frequency Modulation (p-PFM) and primary current peak Amplitude Modulation (AM) in discontinuous conduction mode (DCM). The system operating frequency reduces linearly from heavy load to light load in each interval of the p-PFM, and operating frequency is fixed at medium load by varying primary current peak amplitude.

The AP3984 has good transient characteristics in combination with the secondary side IC like AP4341/AP43410 (PSR Accelerator). Typically, minimal voltage of 4.3V at PCB side can be achieved for dynamic test of 5V application system.

The AP3984 provides operating frequency dithering function to improve EMC performance of power supply. The AP3984 also has programmable cable voltage drop compensation function by external resistor.

评估板AP3984 5V 1A EV1主要特性:

 Primary Side Control for Eliminating Opto-coupler
 Built-in 700V BJT
 Excellent Transient Characteristics
 High Voltage and Super-speed Start up
 External Adjustable Output Cable Voltage Drop Compensation
 Ultra-low No-load Power Consumption(<10mW)
 Multiple PWM/PFM Mode to Improve Audio Noise and Efficiency
 Valley-on for Higher Efficiency and Better EMI
 Multiple Protections:
 Over Voltage Protection (OVP)
 Output Short Circuit Protection (SCP)
 Over Temperature Protection (OTP)
 Totally Lead-free & Fully RoHS Compliant (SO-7)
 Halogen and Antimony Free. “Green” Device

评估板AP3984 5V 1A EV1应用:

 Chargers
 Auxiliary Supplies
 Set Top Boxes
 Appliances

主要电源指标(CV & CC 模式)

主要指标和测试结果:


图5.评估板AP3984 5V 1A EV1外形图(底视图)

图6.评估板AP3984 5V 1A EV1外形图(顶视图)

图7.评估板AP3984 5V 1A EV1电路图
评估板AP3984 5V 1A EV1材料清单:


图8.评估板AP3984 5V 1A EV1 PCB设计图:左:顶层;右:底层
详情请见:
https://www.diodes.com/assets/Datasheets/AP3984.pdf
https://www.diodes.com/assets/Uploads/AP3984-PSR-EV1-5V-1A-EV1-Board-User-Guide-2018-03022018.pdf
AP3984.pdf
AP3984-PSR-EV1-5V-1A-EV1-Board-User-Guide-2018-03022018.pdf

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