Powerint 公司的54W(200W峰值)音频放大器电源参考设计RDR-203是采用PeakSwitch 系列的PKS607YN,可以替代用于音频放大器的线性电源. PKS607YN集成了700V功率MOSFET,振荡器,用与起动的高压开关电流源,限流和热关断功能.此外还具有自动重器,线路欠压检测和频率抖动. 新颖的参考设计RDR-203能消除标准浸漆变压器所产品生的可听见噪音.本文介绍了PeakSwitch系列器件的主要特性格,功能方框图与采用PeakSwitch系列PKS606Y的 32 W(连续),81W(峰值)通用输入电源电路图.此外还主要介绍了54W(200W峰值)音频放大器电源参考设计RDR-203主要的设计亮点,详细电路图和所用元件清单(BOM).
PeakSwitch is designed to address applications with high peak-to-continuous power ratio demands. The very high switching frequency during peak power loads and excellent load transient response reduce system cost as well as component count and size. PeakSwitch incorporates a 700 V power MOSFET, oscillator, high voltage switched current source for startup, current limit, and thermal shutdown onto a monolithic device. In addition, these devices incorporate auto-restart, line under-voltage sense and frequency jittering. An innovative design minimizes audio frequency components in the simple ON/OFF control scheme to practically eliminate audible noise with standard varnished transformer construction.

PKS607YN 亮点:
EcoSmart– Extremely Energy-Efficient
Standby output power ≥0.6 W for 1 W input (high line)
Sleep mode power ≥2.4 W at 3 W input (high line)
No-load consumption <200 mW at 265 VAC input
Surpasses California Energy Commission (CEC), ENERGY STAR, and EU requirements
PeakSwitch Features Reduce System Cost
Delivers peak power of up to three times maximum continuous output power
277 kHz operation during peak power significantly reduces transformer size
Programmable smart AC line sensing provides latching shutdown during short circuit, overload and open loop faults, and prevents glitches during power down or brownout
Two external components reset latch on AC removal
Adaptive switching cycle on-time extension increases low line peak output power, minimizing bulk capacitor size
Adaptive current limit reduces output overload power
Frequency jittering reduces EMI filter cost
Tight I2f tolerances and negligible temperature variation of key parameters ease design and lower cost
Accurate hysteretic thermal shutdown with automatic recovery provides complete system level overload protection and eliminates need for manual reset
Better System Cost/Performance over RCC & Discrete
Simple ON/OFF control – no loop compensation needed
Very low component count – higher reliability and single side printed circuit board
High bandwidth provides fast turn on with no overshoot and excellent transient load response
Peak current limit operation rejects line frequency ripple
Built-in current limit and hysteretic thermal protection

PKS607YN 应用:
Inkjet printer
Data storage, audio amplifier, DC motor drives

图1.PKS607YN功能方框图

图2.采用PeakSwitch PKS606Y的 32 W(连续),81W(峰值)通用输入电源

54W(200W峰值)音频放大器电源参考设计RDR-203
Reference Design Report for a 54 W (200 W Peak) Audio Amplifier Power Supply Using PKS607YN This document is an engineering report describing a 54 W continuous, 200 W peak power supply design utilizing two PKS607YN power conversion ICs. This power supply is intended as a replacement for linear power supplies for audio amplifiers.
The document contains the power supply specification, schematic, bill of materials, transformer documentation, printed circuit layout, and performance data.

图3.54W(200W峰值)音频放大器电源参考设计RDR-203外形图


图4.54W(200W峰值)音频放大器电源参考设计RDR-203电路图
54W(200W峰值)音频放大器电源参考设计RDR-203材料清单(BOM):