TI TPS7H4003-SEP抗辐射3-7V输入18A同步降压转换器解决方案

TI公司的TPS7H4003-SEP是抗辐射3-7V输入18A同步降压转换器,在热增强34引脚陶瓷扁平封装内集成了低电阻高边和低边MOSFET.通过电流模式控制,器件具有高效率和降低元件数量.输出电压启动增率由SS/TR引脚控制,允许工作在单独电源或跟踪状态.加电次序由正确地配置使能和功率良好引脚来进行. TPS7H4003-SEP由SYNC2引脚配置成初级-次级模式,四个器件能配置成并行而不需要外接时钟.高边FET的逐个周期电流限制保护了器件过载状态,并由低边源电流的保护来增强,从而避免电流跑偏.此外还有低边沉电流保护,关断低边MOSFET,以防止反向电流过大.当芯片温度超过热极限时, 热关机会禁用该部件. TPS7H4003-SEP抗辐射性能包括SEL, SEB和SEGR免疫高达LET = 43 MeV-cm2/mg, SET 和SEFI 特佂高达LET = 43 MeV-cm2/mg以及TID确保每个晶圆芯片高达50 krad(Si).器件的峰值效率为94% (VO = 1 V at 100 kHz),集成了17-mΩ 和9-mΩ MOSFET, VIN的电源轨从3V到7V.主要用在空间卫星点负载电源,通信有效载荷和光学成像有效载荷本文介绍了TPS7H4003-SEP主要特性,功能框图, 典型应用电路图, 并行配置应用框图, 评估板TPS7H4003EVM主要特性,电路图,材料清单和PCB设计图.

The TPS7H4003-SEP is a radiation-tolerant, 7-V, 18-A synchronous buck converter with integrated low resistance high-side and low-side MOSFETs in a thermally enhanced 34-pin ceramic flatpack package.

High efficiency and reduced component count are achieved through current mode control.

The output voltage start-up ramp is controlled by the SS/TR pin which allows operation as either a stand alone power supply or in tracking situations. Power sequencing is possible by correctly configuring the enable and the power good pins. The TPS7H4003-SEP can be configured in primary-secondary mode and with the SYNC2 pin, four devices can be

configured in parallel without an external clock.

Cycle-by-cycle current limiting on the high-side FET protects the device in overload situations and is enhanced by a low-side sourcing current protection which prevents current runaway. There is also a low-side sinking current protection which turns off the low-side MOSFET to prevent excessive rever...