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[原创]ST L5964数控汽车应用3.5A DC-DC转换器解决方案

关键词:电源管理 DC/DC转换器 ST L5964

时间:2020-09-29 11:40:20       来源:中电网

ST公司的L5964是双路降压开关稳压器,具有内部功率开关和低压降线性/待机稳压器,设计用于汽车电池电源应用.所有的稳压器有单独的确电源,赋能引脚,电源良好和热保护.开关稳压器有可选择的电压监视器和电源良好以及可选择的限流值.两个DC/DC转换器能在自由运行条件下工作,可选择频率为270 kHz或2.2 MHz,或同步到外接时钟(SYNCIN引脚).它们是180反相,而同步输出信号(SYNCOUT引脚)与第一个稳压器是90反相.这种相移简化了两个IC的同时应用(4个DC/DC稳压器).L5964的输入电压从3.3V到26V,输出电压由外接分压器选择(反馈电压在0.9V),输出电压最低为0.9V,最大值有最大占空比设限.L5964具有AEC-Q100资质.主要用在USB-PD 2.0和3.0电源,汽车信息娱乐电源和车内DC/DC模块和电源.本文介绍了L5964主要特性,简化通用框图和框图,应用电路以及评估板AEK-POW-L5964V1主要特性,框图,电路图和材料清单.

 

L5964 is a dual step-down switching regulator with internal power switches and a low drop-out linear/standby regulator, designed for car battery supplied applications. All the regulators have independent supply voltages, enables pins, power goods and thermal protections.

The switching regulators have selectable voltage supervisors and power goods, and selectable current limits. The LDO has power good and fixed current limitation.

The PMIC finds application in different automotive systems, where load dump protection and wide input voltage range are mandatory.

Typically, the regulator connected to the battery works at low frequency, while the one connected to the pre-regulated voltage can make the mos..

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