High Brightness Boost Led Driver With 1:3000 Dimming Ratio And Excellent Current Regulation


Posted on Feb 6, 2014

Conventionally a MOSFET with a voltage rating of 1500V or with a Half-Bridge connection using two MOSFETs of 800-900V, would be used for SMPS applications requiring input voltages higher than 380Vac. However, these methods have the disadvantages of a complicated circuit structure and high cost. FSC developed a more effective solution: a power IGBT


High Brightness Boost Led Driver With 1:3000 Dimming Ratio And Excellent Current Regulation
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rated at 1500V-5A. This technical note, describes the design of the 25W flyback power supply using a SGL5N150UF. The major experimental operational characteristics of the IGBT are also explained. Performance in High Input Voltage Flyback Converter Figure 1 shows the design of a 25 watt flyback converter with an output at (+5V, 5A), operating at a switching frequency of 50kHz and high input voltages of 380 - 500Vac. This type of switching power supply is used for applications requiring high input voltages such as an inverter and other instruments. This discontinuous mode flyback converter using a KA3844 current mode controller features good voltage tracking by using the pulse by pulse current sensing on the primary side, and an isolated secondary feedback loop. The KA3844 PWM IC directly drives the power IGBT




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