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具有 BJT 的 85VAC-265VAC 输入、12V/3W 低成本反激

2015-4-13 14:32:53 2112

0 `描述及特性 This 12V/5W reference design is optimized for very low cost and yet maintains good efficiency. Two key factors for minimizing cost are a BJT is used for the main power switch, and primary-side regulation eliminates the need for an optocoupler. The UCC28720 quasi-resonant flyback controller is able to implement both of these features. With quasi-resonant switching, efficiency at full load is over 80%, even with a BJT switch. Light-load losses are kept below 100mW due to burst mode operation. PMP9074 Test Results.pdf (1.88 MB, 下载次数: 10 ) PMP9074 BOM.pdf (81.29 KB, 下载次数: 1 ) PMP9074 Gerber.zip (171.06 KB, 下载次数: 2 ) PMP9074 PCB.pdf (279.26 KB, 下载次数: 2 ) PMP9074 Schematic.pdf (126.89 KB, 下载次数: 3 ) ` 0
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