【应用】AAP6011A DC-DC转换器应用于送餐商用机器人输出12V/3A以及详细设计参数

时间： 2020-07-01 来源：世强

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某客户新研发一款送餐商用机器人。在正常工作过程中主要由锂电池24-36V提供主要供电电源。板载模块需要DC-DC转换器得到12V/3A的供电需求。推荐客户使用国产圣邦微电子SGMICRO AAP6011A。主要规格参数如下表所示：

从图中可以看到，最大输出电流Iout为3.5A，满足客户的使用需求。而且AAP6011A的内置Mos管和同步整流开关，外部电路简单：

因客户开发周期紧张，在这里我们同时向客户推荐一套输出为12V/3A的元件参数供客户参考。主要参数设计如下。由规格书可知：

Vref=0.797V，Vout=12V，实际计算得到R1/R2=14.12

在这里我们选取R1=42K 0603封装，R2=3K 0603封装。

输出电流为3A：

Rcs=26mΩ 0603

输出电感L：

其中Fsw=125Khz，Vin=24V-36V，Kripple=0.3.D=Vout/Vin，Iout=3A，计算得到L=63uH。

输出电容：输出12V，一般放置1.5倍的余量20V，220uF。

由于电解电容在虑高频部分效果不是很明显，所以我们在输出部分并联一个0.1uF的陶瓷电容C6。

为了更小的纹波（＜30mV）在输出部分增加一级RC电路，其中R3=5.1Ω C4=2.2nF。整个参数设计如下：

本次客户要求12V/3A的输出能力，以上提供简单的参数设计来作为参考。在实际应用中可以根据调试情况和使用环境做一些微型调整达到使用要求。

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SGMICRO（圣邦微）信号链和电源管理芯片选型指南

描述- SGMICRO specializes in high-performance and high-quality analog and mixed-signal integrated circuits, and is committed to building a comprehensive portfolio of the highest quality analog and mixed-signal integrated circuits to address all customer needs.

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

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SGMICRO DC/DC转换器选型表

SGMICRO DC/DC转换器选型表包含包含同步整流降压转换器、AMOLED显示屏电源降压、非同步降压转换器升压、同步整流升压转换器、非同步升压转换器、电荷泵DC/DC转换器、专用DC/DC转换器和LCM偏置电源；升降压、电荷泵供电，最大输入电压60V，最大开关电流10A，内置MOS。

产品型号	品类	CH	Enable	Vcc (Min)(V)	Vcc (Max)(V)	I_OUT(mA)	Frequency (kHz)	Iq (μA)	SHDN Iq(μA)	Package
SGM6010	DC/DC Synchronous Rectifier Buck Converters	1	L	3	5.5	3000	300 to 2000	0.41	2	TDFN-3×3-10L