TI TPS7H4002-SP辐射硬度放心(RHA)3A同步降压转换解决方案

TI公司的TPS7H4002-SP是抗辐射加固的5.5V 3A同步降压转换器,通过高效和集成了高边和低边MOSFET具有最佳的小型化设计.通过电流模式控制,降低了元件数量进一步节省了空间,而高开关频率又降低了电感的占位面积.抗辐射加固高达TID 100 krad(Si),SEL, SEB和SEGR 免疫到LET = 75 MeV-cm2/mg,SET 和SEFI 特征化高达LET = 75 MeV-cm2/mg,峰值效率为96.9% (VO = 2.5 V),集成了50-mΩ和35-mΩ MOSFET,最大输出电流3A.器件具有灵活的开关频率选择:100-kHz到1-MHz可调内部振荡器,外接同步能力为100 kHz 到1 MHz,0.807-V ±1.5%电压基准,能对温度,辐射,线路和负载进行调整.主要用在空间点负载电源如FPGA,MCU,数据转换器和ASIC,通信有效载荷和光学图像有效载荷.本文介绍了TPS7H4002-SP主要特性,详细功能框图, 典型应用电路图,评估模块TPS7H4002EVM-CVAL主要特性和默认配置表,电路图,材料清单和PCB设计图.

The TPS7H4002-SP is a radiation hardened, 5.5-V, 3-A synchronous step-down converter, which isoptimized for small designs through high efficiencyand by integrating the high-side and low-sideMOSFETs. Further space savings are achievedthrough current mode control, which reducescomponent count, and a high switching frequency,

which reduces the inductor footprint.

The output voltage startup ramp is controlled by theSS/TR pin which allows operation as either a standalone power supply or in tracking situations. Powersequencing is also possible by correctly configuringthe enable and the open drain power good pins. Inaddition, the TPS7H4002-SP can be configured inprimary-secondary mode for parallel operation.

Cycle-by-cycle current limiting on the high-sideFET protects the device in overload situations andis enhanced by a low-side sourcing current limitwhich prevents current runaway. There is also alow-side sinking current limit which turns off thelow-side MOSFET to prevent excessive reversecurrent. Thermal shutdown disables the part when dietemperature exceeds thermal limit.

TPS7H4002-SP主要特性:

• Radiation performance:

– Radiation-hardness-assured up toTID 100 krad(Si)