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[原创] Power Integrations TinySwitch-4 12W电源参考设计RDR-839

关键词:电源管理 AC/DC转换器 PWM MOSFET

时间:2019-09-17 13:49:45?????? 来源:中电网

Power Integrations公司的TinySwitch-4系列是具有电源控制器的高压功率MOSFET开关.和通常的PWM控制器不同,它采用简单的ON/OFF控制来调整输出电压.该控制器包括一个振荡器,使能电路(检测和逻辑),限流状态机,5.85V稳压器, BYPASS/MULTI-FUNCTION引脚,欠压和过压电路,以及限流选择电路,超温保护电路,限流电路,内置前沿消隐电路和725V功率MOSFET.开态UV阈值±5%,通过BP/M电容值可选择更高的限流值,更低的限流值提高封闭适配器/充电器的效率,扩展DRAIN和所有其它引脚的爬电距离,从而提高了现场可靠性,具有极好的能量效率EcoSmart?,容易满足所有全球的能效条例,带偏压线圈的无负载功耗小于30mW,265VAC无偏压线圈无负载功耗小于150mW,主要用在PC待机和其它辅助电源,DVD/PVR和其它低功率机顶译码器,家用电器,工业告警和计量设备的电源,以及手机和无绳电话,PDA,数码相机,MP3/手持音频设备的充电器/适配器.本文介绍了TinySwitch-4产品亮点,功能框图,以及采用TinySwitch-4系列TNY290PG的12W电源参考设计主要指标,电路图,变压器电路图和构造图,以及材料清单和PCB设计图.

TinySwitch-4 combines a high-voltage power MOSFET switch with a power supply controller in one device. Unlike conventional PWM (pulse width modulator) controllers, it uses a simple ON/OFF control to regulate the output voltage.

The controller consists of an oscillator, enable circuit (sense and logic), current limit state machine, 5.85 V regulator, BYPASS/MULTI-FUNCTION pin undervoltage, overvoltage circuit, and current limit selection circuitry, over-temperature protection, current limit circuit, leading edge blanking, and a 725 V power MOSFET. TinySwitch-4 incorporates additional circuitry for line undervoltage sense, auto-restart, adaptive switching cycle on-time extension, and frequency jitter. Figure 1 shows the functional block diagram with the most important features.

TinySwitch-4产品亮点:

Lowest System Cost with Enhanced Flexibility
725 V rated MOSFET Increases BV de-rating margin
Line compensated overload power – no additional components Dramatically reduces max overload variation over universal input voltage range
±5% turn on UV threshold: line voltage sense with single external resistor
Simple ON/OFF control, no loop compensation needed
Selectable current limit through BP/M capacitor value Higher current limit extends peak power or, in open frame applications, maximum continuous power
Lower current limit improves efficiency in enclosed adapters/chargers
Allows optimum TinySwitch?-4 choice by swapping devices with no other circuit redesign
Tight I2f parameter tolerance reduces system cost Maximizes MOSFET and magnetics utilization
ON-time extension – extends low-line regulation range/hold-up time to reduce input bulk capacitance
Self-biased: no bias winding or bias components
Frequency jittering reduces EMI filter costs
Pin-out simplifies heat sinking to the PCB
SOURCE pins are electrically quiet for low EMI
Enhanced Safety and Reliability Features
Accurate hysteretic thermal shutdown protection with automatic recovery eliminates need for manual reset
Auto-restart delivers <3% of maximum power in short-circuit and open loop fault conditions
Output overvoltage shutdown with optional Zener Fast AC reset with optional UV external resistor
Very low component count enhances reliability and enables single-sided printed circuit board layout
High bandwidth provides fast turn-on with no overshoot and excellent transient load response
Extended creepage between DRAIN and all other pins improves field reliability EcoSmart?– Extremely Energy Efficient
Easily meets all global energy efficiency regulations
No-load <30 mW with bias winding, <150 mW at 265 VAC without bias winding
ON/OFF control provides constant efficiency down to very light loads – ideal for mandatory CEC regulations and EuP standby requirements

TinySwitch-4应用:

PC Standby and other auxiliary supplies
DVD/PVR and other low power set top decoders
Supplies for appliances, industrial systems, metering, etc
Chargers/adapters for cell/cordless phones, PDAs, digital cameras, MP3/portable audio, shavers, etc.

图1.TinySwitch-4功能框图

图2.TinySwitch-4典型待机应用图

图3.采用TinySwitch-4系列TNY290PG的12W电源参考设计

This engineering report describes an isolated flyback converter designed to provide a nominal output voltage of 12 V at 1 A load from a wide input voltage range of 85 VAC to 265 VAC. This adapter utilizes the TNY288P from the TinySwitch-4 family of ICs, with provision for D and K packages placed on the top layer.

This document contains the complete power supply specifications, bill of materials, transformer construction, circuit schematic and printed circuit board layout, along with performance data and electrical waveforms.

12W电源参考设计主要特性:

? EcoSmartTM – meets all existing and proposed energy efficiency standards including ErP.
? No-load consumption <30 mW; more than 300 mW available in stand-by with 500 mW input
? 85% average active-mode efficiency
? The board can fit P/G or the cost-effective D package
? BP/M capacitor value selects power MOSFET current limit for greater design flexibility
? Accurate detection output overvoltage protection (OVP) using primary bias winding sensed shutdown feature
? Accuratelytoleranced I2f parameter (-10%, +12%) reduces system cost
? Increases MOSFET and magnetics power delivery
? Reduces overload power, which lowers output diode and capacitor costs
? Integrated TinySwitch-4 safety / reliability features
? Accurate (±5%), auto-recovering, hysteretic thermal shutdown function maintains safe PCB temperatures under all conditions
? Auto-restart protects against output short-circuit and open loop fault conditions
? P and G package with >3.2 mm creepage on package enables reliable operation in high humidity and high pollution environments
? Meets EN550022 and CISPR-22 Class B conducted EMI with >12 dBμV margin
? Meets IEC61000-4-5 Class 3 AC line surge

图4.12W电源参考设计外形图(顶视图)

图5.12W电源参考设计外形图(底视图)
12W电源参考设计主要指标:


图6.12W电源参考设计电路图

12W电源参考设计材料清单:


图7.12W电源参考设计PCB设计图(顶视图)

图8.12W电源参考设计PCB设计图(底视图)

图9.12W电源参考设计变压器电路图

图10.12W电源参考设计变压器构造图
详情请见:
ac-dc.powerint.cn/sites/default/files/product-docs/tinyswitch-4_family_datasheet.pdf">https://ac-dc.powerint.cn/sites/default/files/product-docs/tinyswitch-4_family_datasheet.pdf
https://ac-dc.powerint.cn/sites/default/files/product_document/design_example/rdr-839_12watt_power_supply_using_tinyswitch-4.pdf
tinyswitch-4_family_datasheet.pdf
rdr-839_12watt_power_supply_using_tinyswitch-4.pdf

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