TPS2121 导通电阻特性

简 介本文测试了多电源切换芯片TPS2121的导通特性包括最低工作电压和导通电阻。测试结果表明输入电压需超过2.6V才能正常输出导通电阻约为0.1欧姆。通过单面PCB快速制板验证了其性能适用于多电源自动切换场景。关键词TPS2121TSP2121导通特性电源多路复用起Power MUX TPS2121TPS212X Datasheet**AD\Test\2026\August\TestTPS2121More.PcbDoc ***01【导通电阻】一、背景昨天测试了多电源自动切换芯片 TPS2121的基本功能。 今天测量一下这个芯片的其它特性。 通过铺设单面测试电路板 测试一下电源切换芯片的最低输入电压。 也就是输入电压需要超过多少伏之后 才能够从芯片的输出端口输出。 另外测量一下芯片导通对应的串联电阻大约是多少。二、测量电路设计测试电路板 在昨天测试电路板的原理图基础上 增加了带个四芯单独输入端口。 TPS2121仍然配置成两路电压比较模式 也就是输出电压比较高的输入通道的电压。 铺设单面PCB 适合一分钟制版。 一分钟之后得到了测试电路板。电路板制作的非常完美。 下面焊接测试。三、测试结果焊接电路板使用高压水蒸气清洗之后进行测试 通过四芯探针夹子将可调电源加入电路 在通道一输入正五伏电压 可以在 TPS2121输出端测量到5伏的输出电压 现在输出端是空载 接下来我们给输出端焊接一个510 欧姆的负载电阻 测量一下输入输出电压关系 这样我们可以测量究竟该芯片最低工作电压可以低到多少。绘制出输入与输出电压曲线 在输入电压超过 2.6V 之后 输出电压便与输入电压相同 同步上升了。 输入电压从 3V 逐步变化到 12V 输出电压也从 3V 变化到12V。 测量输入和输出之间的电压。 可以看到也是线性上升 这是因为输出电压上升 在固定的负载上所产生的输出电压也是线性上升。 由负载电阻以及对应的输出电压和输出压差 可以计算出TPS2121的导通电阻。 这个到导通电阻基本上在 95毫欧姆左右 电阻大小基本上是恒定的。※总结 ※本文测试了多电源切换芯片 TPS2121 的导通特性。 输入电压需要超过 2.6V之后 才能够输出相应的电压。 通道电阻大约在 0.1 欧姆左右。#!/usr/local/bin/python# -*- coding: gbk -*-## TSET1.PY -- by Dr. ZhuoQing 2026-08-14## Note:#fromheadmimport*fromtsmodule.tsvisaimport*fromtsmodule.tsstm32import*dm3068open()vinlinspace(3,12,100)vout[]vdiff[]forvinvin:dh1766volt1(v)time.sleep(2)vvmeterval()vodm3068vdc()vout.append(vo)vdiff.append(vv[3])tspsave(meas,vinvin,voutvout,vdiffvdiff)printff(v,vv,vo)plt.plot(vin,vout,lw3)plt.xlabel(Vin(V),colorsteelblue,fontsize24)plt.ylabel(Vout(V),colorsteelblue,fontsize24)plt.grid(True,whichboth,linestyle--,alpha0.7)plt.tight_layout()plt.show()#------------------------------------------------------------# END OF FILE : TSET1.PY##!/usr/local/bin/python# -*- coding: gbk -*-## TEST2.PY -- by Dr. ZhuoQing 2026-08-14## Note:#fromheadmimport*vin,vout,vdifftspload(meas,vin,vout,vdiff)Rload510Ron[v1/v2*Rloadforv1,v2inzip(vdiff,vout)]plt.plot(vin,Ron,lw3)plt.xlabel(Vin(V),colorsteelblue,fontsize24)plt.ylabel(Ron(Ohm),colorsteelblue,fontsize24)plt.grid(True,whichboth,linestyle--,alpha0.7)plt.tight_layout()plt.show()#------------------------------------------------------------# END OF FILE : TEST2.PY#vin[3.0000,3.0909,3.1818,3.2727,3.3636,3.4545,3.5455,3.6364,3.7273,3.8182,3.9091,4.0000,4.0909,4.1818,4.2727,4.3636,4.4545,4.5455,4.6364,4.7273,4.8182,4.9091,5.0000,5.0909,5.1818,5.2727,5.3636,5.4545,5.5455,5.6364,5.7273,5.8182,5.9091,6.0000,6.0909,6.1818,6.2727,6.3636,6.4545,6.5455,6.6364,6.7273,6.8182,6.9091,7.0000,7.0909,7.1818,7.2727,7.3636,7.4545,7.5455,7.6364,7.7273,7.8182,7.9091,8.0000,8.0909,8.1818,8.2727,8.3636,8.4545,8.5455,8.6364,8.7273,8.8182,8.9091,9.0000,9.0909,9.1818,9.2727,9.3636,9.4545,9.5455,9.6364,9.7273,9.8182,9.9091,10.0000,10.0909,10.1818,10.2727,10.3636,10.4545,10.5455,10.6364,10.7273,10.8182,10.9091,11.0000,11.0909,11.1818,11.2727,11.3636,11.4545,11.5455,11.6364,11.7273,11.8182,11.9091,12.0000]vout[2.9744,3.0639,3.1544,3.2451,3.3346,3.4251,3.5157,3.6053,3.6957,3.7852,3.8758,3.9663,4.0558,4.1463,4.2369,4.3264,4.4169,4.5074,4.5970,4.6875,4.7771,4.8676,4.9581,5.0476,5.1382,5.2288,5.3184,5.4089,5.4994,5.5889,5.6792,5.7688,5.8594,5.9499,6.0394,6.1300,6.2206,6.3101,6.4006,6.4911,6.5807,6.6713,6.7617,6.8513,6.9418,7.0314,7.1220,7.2125,7.3021,7.3926,7.4832,7.5727,7.6632,7.7536,7.8432,7.9337,8.0232,8.1137,8.2042,8.2938,8.3844,8.4748,8.5644,8.6549,8.7452,8.8348,8.9253,9.0148,9.1054,9.1959,9.2856,9.3760,9.4664,9.5560,9.6464,9.7368,9.8263,9.9168,10.0073,10.0968,10.1873,10.2769,10.3673,10.4578,10.5473,10.6378,10.7283,10.8179,10.9084,10.9988,11.0883,11.1788,11.2683,11.3588,11.4492,11.5387,11.6291,11.7195,11.8090,11.8995]vdiff[0.0006,0.0006,0.0006,0.0006,0.0006,0.0006,0.0006,0.0007,0.0007,0.0007,0.0007,0.0007,0.0007,0.0008,0.0008,0.0008,0.0008,0.0008,0.0008,0.0009,0.0009,0.0009,0.0009,0.0009,0.0009,0.0010,0.0010,0.0010,0.0010,0.0010,0.0010,0.0010,0.0011,0.0011,0.0011,0.0011,0.0011,0.0011,0.0012,0.0012,0.0012,0.0012,0.0012,0.0012,0.0013,0.0013,0.0013,0.0013,0.0013,0.0013,0.0014,0.0014,0.0014,0.0014,0.0014,0.0014,0.0015,0.0015,0.0015,0.0015,0.0015,0.0015,0.0016,0.0016,0.0016,0.0016,0.0016,0.0016,0.0017,0.0017,0.0017,0.0017,0.0017,0.0017,0.0018,0.0018,0.0018,0.0018,0.0018,0.0018,0.0019,0.0019,0.0019,0.0019,0.0019,0.0019,0.0020,0.0020,0.0020,0.0020,0.0020,0.0020,0.0021,0.0021,0.0021,0.0021,0.0021,0.0021,0.0022,0.0022]■ 相关文献链接:电源多路复用起Power MUX TPS2121-CSDN博客TPS212X Datasheet