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IW3602-00 Datasheet(PDF) 7 Page - Dialog Semiconductor |
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IW3602-00 Datasheet(HTML) 7 Page - Dialog Semiconductor |
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7 / 18 page  iW3602-00 AC/DC Digital Power Controller for Dimmable LED Drivers Rev. 0.8 Preliminary iW3602-00 © 2014 Dialog Semiconductor (UK) Ltd. Datasheet 7 of 20 8.0 Functional Block Diagram The iW3602-00 combines two functions: 1) wall dimmer type detection and dimmer phase measurement; and 2) output LED light dimming. It uses digital control technology, which consists of: 1) chopping circuit, which helps to increase the power factor and serves as a dynamic impedance to load the dimmer; 2) primary side controlled isolated flyback converter. The iW3602-00 provides a low cost dimming solution which enables LED bulb to be used with most of the common wall dimmers. This allows LED bulbs to directly replace conventional incandescent bulbs with ease. The iW3602 can detect and operate with leading-edge, and trailing-edge dimmers as well as no-dimmer. The controller operates in critical discontinuous conduction mode (CDCM) to achieve high power efficiency and minimum EMI. It incorporates proprietary primary-feedback constant current control technology to achieve tight LED current regulation. Figure 3.1 shows a typical iW3602-00 application schematic. Figure 8.1 shows the functional block diagram. The advanced digital control mechanism reduces system design time and improves reliability. The start-up algorithm makes sure the VCC supply voltage is ready before powering up the IC. The iW3602-00 provides multiple protection features for current limit, over-voltage protection, and over temperature protection. The VT function can provide over-temperature compensation for the LED. The external NTC senses the LED temperature. If the VT pin voltage is below VP-LIM(HI), the controller reduces the LED current. If the VT pin voltage is below VSH-TH then the controller turns off. Figure 8.1 : iW3602-00 Functional Block Diagram VIN GND Enable VCC 5 VT 4 VSENSE VFB VVMS VIPK OUTPUT ISENSE 6 1.89V 0V ~ 1.8V VIN_A 0.0V ~ 1.8V IPEAK VOCP Start-up DAC – + 2 3 8 Gate Driver Enable ZIN 100µA 65kΩ 7 Dimmer Detection and Dimmer Phase Measurement ADC MUX ADC Gate Driver OUTPUT(TR) 65kΩ 1 VOVP Signal Conditioning Constant Current Control |
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