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利用MAX15026构建LCDTV或机顶盒辅助电源的参考设计

发布时间:2020-06-30 18:59:47 阅读: 来源:橡塑铝箔厂家

利用MAX15026构建LCD TV或机顶盒辅助电源的参考设计

本文引用地址:摘要:本应用笔记介绍了使用低成本、高效率同步降压转换器MAX15026构建LCD TV或机顶盒辅助电源的参考设计。参考设计从6.5V至24V输入电压范围,产生一个5V、5A输出。 以下内容列出了参考设计的主要规格、详细电路示意图(图1)和所需的材料清单(表1)。

规格输入电压范围:6.5V至24V输出电压:5V输出电流:5A输出电压纹波(峰峰值):50mV转换器开关频率:300kHz过流保护限制:6A效率:> 90% (标准工作模式)图1. 同步整流降压转换器MAX15026在300kHz开关频率下的电路图表1. 材料清单DesignatorValueDescriptionPartFootprintManufacturerQuantityC1220µF, 35VCapacitorEEVFK1V221P8mm x 10.2mmPanasonic1C2, C34.7µF, 50VCapacitorGRM31CR71H475KA12L1206Murata2C40.1µF, 50VCapacitorGRM188R71H104KA93D0603Murata1C54.7µF, 6.3VCapacitorGRM188R60J475KE19D0603Murata1C62.2µF, 6.3VCapacitorGRM188R60J225KE19D0603Murata1C71µF, 50VCapacitorGRM21BR71H105KA12L0805Murata1C80.47µF, 16VCapacitorGRM188R71C474KA88D0603Murata1C9, C161200pF, 50VCapacitorGRM1885C1H122JA01D0603Murata2C10, C1147µF, 10VCapacitorGRM32ER71A476KE15L1210Murata2C12, C13, C1422µF, 10VCapacitorGRM31CR71A226KE15L1206Murata3C15560pF, 50VCapacitorGRM1885C1H561JA01D0603Murata1C1722pF, 50VCapacitorGRM1885C1H220JA01D0603Murata1R110ΩResistorSMD 1% Resistor0603Vishay1R210kΩResistorSMD 1% Resistor0603Vishay1R3, R62.2ΩResistorSMD 1% Resistor0603Vishay2R415kΩResistorSMD 1% Resistor0603Vishay1R556.2kΩResistorSMD 1% Resistor0603Vishay1R73.57ΩResistorSMD 1% Resistor1206Vishay1R8102kΩResistorSMD 1% Resistor0603Vishay1R913.7kΩResistorSMD 1% Resistor0603Vishay1R102.74kΩResistorSMD 1% Resistor0603Vishay1R1147.5kΩResistorSMD 1% Resistor0603Vishay1L110µH ±20%, 5.5AInductorSLF12575T-100M5R4-PF12.5mm x 12.5mm x 7.5mmTDK1N130V, 6.3A, 35.5mΩ—Q1;30V, 8.6A, 16.5mΩ—Q2Dual MOSFETFDS6982AS8-SOFairchild1U1PWM ControllerLow-Cost, DC-DC Synchronous Buck Controller with a 4.5V to 28V Operating RangeMAX15026BETD+14-TDFN-EPMaxim1

性能数据图2. VIN = 24V、VOUT = 5V条件下的稳压输出、输入电压和开关节点电压。Ch1:VOUT;Ch2:VIN;Ch3:LX节点电压图3. 使能、软启动、软停止和PGOOD时序波形。

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