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| Linear LT8582故障保护双路PWM DC电源解决方案 | |||||
作者：Linear 文章来源：Linear 点击数： 更新时间：2012-2-2  |
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The LT8582 is a dual independent channel PWM DC/DC converter with a power good pin and built-in fault protection to help guard against input overvoltage and overtemperature conditions. Each channel consists of a 42V master switch and a 42V slave switch that can be tied together for a total current limit of 3A. The LT8582 is ideal for many local power supply designs. Each channel can be easily configured in boost, SEPIC, inverting, or flyback configurations. Together, the two channels can produce a 12V and a –12V output with 14.4W of combined output power from a 5V input. In addition, the LT8582’s slave switch allows the part to be configured in high voltage, high power charge pump topologies that are more efficient and require fewer components than traditional circuits. The LT8582 also features innovative SHDN pin circuitry that allows for slowly varying input signals and an adjustable undervoltage lockout function. Additional features such as output short protection, frequency foldback and soft-start are integrated. The LT8582 is available in a 24-pin 7mmx 4mm DFN package. LT8582主要特性: Dual 42V, 3A Combined Power Switch Master/Slave (1.7A/1.3A) Switch Design Wide Input Range: 2.5V to 22V Operating, 40V Maximum Transient Power Good Pin for Event Based Sequencing Switching Frequency Up to 2.5MHz Each Channel Easily Configurable as a Boost, SEPIC, Inverting or Flyback Converter Low VCESAT Switch: 270mV at 2.75A (Typical) Can be Synchronized to an External Clock Output Short-Circuit Protection High Gain SHDN Pin Accepts Slowly Varying Input Signals 24-Pin 7mmx 4mm DFN Package LT8582应用: Local Power Supply Vacuum Fluorescent Display (VFD) Bias Supplies TFT-LCD Bias Supplies Automotive Engine Control Unit (ECU) Power  图1. LT8582方框图  图2. LT8582升压转换器电路图:1.5MHz,5V到12V升压  图3. LT8582 SEPIC转换器电路图:700kHz,3V-19V到5V SEPIC拓扑  图4. LT8582双电感反向转换器电路图:1.5MHz,5V到-12V反向电压  图5. LT8582高VOUT电荷泵拓扑电路图  图6. LT8582 5V到+/-12V升压和反向电压电路图  图7. LT8582 VFD和灯丝电源电路图:1MHz开关频率  图8. LT8582 2.7V-5.5V输入+/-15V输出电路图  图9. LT8582超大电容备份电源电路图  图10. LT8582 3-19V输入12V和15V顺序输出电路图  图11. LT8582升压和双电感反向电源拓扑元件布局图  图12. LT8582 SEPIC和双电感反向电源拓扑元件布局图 详情请见: http://cds.linear.com/docs/Datasheet/8582f.pdf |
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