Powerint LNK406EG 14W PWM－模拟调光LED驱动方案(DER263)

Powerin的参考设计DER263是采用LinkSwitchTM-PH系列LNK406EG的14W PWM-模拟调光LED驱动器,LED串的电压电流为28V/500A,输入电压范围从90VAC到265VAC,高效率,230VAC时的PFC大于87%,115VAC时的PFC大于86%,功率因素大于0.9,满足EN61000-3-2 Class C,1000:1调光范围.本文介绍了14W PWM-模拟调光LED驱动器主要特性和指标,电路图,材料清单与PCB布局图.

The document describes a high power-factor secondary referenced, analog dimmable LED driver. The circuit is designed to drive a nominal LED string voltage of 28 V at 500 mA from an input voltage range of 90 VAC to 265 VAC. The LED driver utilizes the LNK406EG from the LinkSwitch-PH family of ICs.

Analog dimming is controlled by an external secondary referenced analog control signal of 0-10 V. 0 volts correspond to minimum light output and 10 V corresponds to maximum brightness. The analog controlled signal is transferred to the primary-side and controls the feedback current IFB of LNK406EG which in turn controls the output power/light output of the driver while maintaining high power factor and low THD.

An active load circuit and control are also included to extend dimming ratio beyond 1000:1 but may be omitted if extended dimming operation is not required.
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