[原创] TI PMP20249双路汽车12.5W USB充电器参考设计

TI公司的PMP20249是EMI优化的双路汽车12.5W USB充电器参考设计,采用LMS3635和LMS3655稳压器以及TPS2549 USB开关,具有CISPR 25 Class 4设计额定值;输入电压从6Vin到18Vin,2.5A时输出电压5V,主要用在汽车USB充电系统和汽车娱乐系统.本文介绍了参考设计PMP20249主要特性和指标,框图,电路图,材料清单和PCB设计图.

PMP20249 is an EMI-optimized design for dual-automotive USB charger system using the LMS3635 andLMS3655 regulators (400-kHz fully-integrated, synchronous buck for automotive applications) and theTPS2549 USB switch (TPS2549-Q1 automotive USB charging port controller with integrated power switchand cable compensation). The design accepts an input voltage range of 6 Vin to 18 Vin and regulates twooutputs of 5 V at 2.5 A for dual-USB ports. This highly efficient design features an inexpensive solution and small-size customized for an automotive USB charger application. A four-layer PCB was used for thisdesign.

The design is divided into four major blocks:
• Front-end protection: Front-end protection against positive and negative pulses (ISO7630 pulse 1, 2a,3a/b) through TVS.
• EMI filter: Differential filter for conducted EMI suppression...

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