Powerint LNK6766E 30W单输出反激电源解决方案

Powerint公司的LinkSwitchTM-HP系列是集成了控制器和高压(650V/725V)功率MOSFET的单片器件,采用连续导通模式(CCM),初级调整(PSR),功率达90W,没有DCM的效率限制或可听见的噪音. 在230VAC时无负载时的功耗小于30mW,主要用在LCD监视器和TV,适配器,家用电器,嵌入式电源(DVD,STB)和工业电源.本文介绍了LinkSwitch-HP系列产品亮点,方框图,适配器电路图以及采用LNK6766E的30W单输出反激转换器参考设计主要特性和指标,电路图,材料清单和PCB布局图.
A LinkSwitch-HP device monolithically integrates a controller and high-voltage power MOSFET into one package. It has a newly developed analogue control scheme, which enables continuous conduction mode (CCM), primary side regulated (PSR) power supplies up to 90 W without the efficiency limitation of DCM or audible noise. It uses an enhanced peak current mode PWM control scheme with multi-mode operation. The multi-mode control engine uses the error amplifier output signal voltage at the COMPENSATION pin to set the operating peak current and switching frequency to maintain the output voltage in regulation as shown in Figure 5. For COMPENSATION pin voltages lower than VC(MCM) (typ. 1.25 V) the device enters multi-cycle modulation (MCM) with a fixed peak current of 25% of the programmed current limit. Several innovative improvements have been added to the peak current mode control to allow primary side regulated CCM operation with no instability. The device meets less than 30 mW input power with no-load at high-line (LNK67xx families).
It also offers extensive built-in features:
• External current limit selection
• Optional programmable shutdown delay time extension
• Optional remote On/Off
• Optional fast AC reset
• Primary-side sensed output overvoltage protection (OVP)
• Lost regulation protection during output overload or short-circuit (auto-restart)
• Internal current limit over line compensation for constant overload power over line
• High-voltage bus overvoltage sense (line O...