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国际整流器(International Rectifier,IR)公司近日推出 IRI SMPS4参考设计样板,针对一般用于 DVD/CD 播放器、机顶盒和多元化消费性电子产品的返驰拓扑式(Flyback Topology)AC-DC 电源电路。这项参考设计样板以 IR 的 IRIS4009AC-DC整合开关(Integrated Switcher)为主开关和控制组件,内含通用 AC 线路输出和15V/4A 全负载 DC 输出。DC 总线中的降压电阻器能触发出 IRIS4009所需的激活电流。电路激活后,主变压器中的偏压绕线便会供应 IRIS4009所需的 Vcc 功率。初级电流控制电路具有一个电流感应电阻器,能把与变压器初级电流成正比的电压引入 IRIS4009的回馈接脚。
International Rectifier (IR) Inc. recently introduced the IRI SMPS4 reference design sample for Flyback Topology AC-DC power circuits typically used for DVD / CD players, set-top boxes and diverse consumer electronics. The reference design sample is IR Switch IRIS4009AC-DC integrated switch (Integrated Switcher) as the main switch and control components, including universal AC line output and 15V / 4A full load DC output. The step-down resistor in the DC bus triggers the required activation current for the IRIS4009. When the circuit is activated, the bias winding in the main transformer supplies the required Vcc power for the IRIS4009. The primary current control circuit has a current sense resistor that introduces a voltage proportional to the primary current of the transformer into the feedback pin of the IRIS4009.