【应用】国产微功耗电压比较器TP2021用于故障指示器对取电电压进行监控，静态电流仅为390nA

时间： 2022-03-03 来源：世强

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故障指示器安装在配电线路上，需要依靠感应线路上的负荷电流获取能量，利用超级电容、电池辅助供电。线路上的负荷电流大小是随时变化的，故障时的电流甚至会成倍突变，这就要求在电路设计时需要对取电电压采取监测，防止电压升高对后端电路造成不可逆的破坏。本文介绍国产思瑞浦的微功耗电压比较器 TP2021用于故障指示器对取电电压进行监控。

下图为故障指示器电源部分的框图。正常时，设备通过电流互感器感应取电，经过整流滤波后为后级Buck和DC-DC转换电路供电。整流滤波后的输入电压经过电阻分压后接到TP2021的输入端，与TP2021的内部参考电压进行比较。当取电电压异常升高时，比较器输出控制信号使能前端过压保护电路，从而钳位输入电压达到保护后级电路安全的目的。

图1 电源框图

TP2021具备滞回功能，可通过外部电阻设置滞回区间，非常灵活，数据手册给出了详细的计算方法。在本项目中，就利用这TP2021的这一功能。图2为TP2021的应用电路，通过外围三颗电阻将滞回区间设置在13.15V~15.96V之间。通过测试，实际的动作电压分别在13.27V和16.16V，误差范围在±1.5%范围内，满足设计要求。

图2 电路图

图3 实测波形

另外，故障指示器对功耗和空间要求极为苛刻，内部电池需要支撑设备长达8年的可靠运行。国产思瑞浦的微功耗电压比较器TP2021具有以下特点，非常适合在故障指示器上应用：

超低静态电流：390nA（典型值）
工作电压范围：1.8V至5.5V
快速响应时间：13μs
内置参考电压：1.224V±1.8%（@V_DD=3V）
推挽输出
驱动能力：±25mA
可选用节省空间的SC70/SOT23封装
工作温度范围：-40℃至+85℃

综上所述，思瑞浦推出的TP2021非常适合在故障指示器等低功耗设备上使用。

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型号- TP2021A-TR,TP2021-TR,TP2021

2024/1/25 - 思瑞浦 - 数据手册 - REV1.7 代理服务技术支持采购服务

TS12001：0.65V/1μA毫微功耗电压检测器，具有双路输出

描述- TS12001是一款低功耗电压检测器，具有双输出功能。该器件可在0.65V至2.5V的电压下工作，总供电电流小于1µA。它集成了0.58V参考电压和具有可重置比较器锁存的比较器，适用于电源故障指示、低电池检测、电池备份检测、CPU、微处理器和逻辑复位控制器以及电池供电系统。TS12001提供推挽和开漏输出，具有预设的UVLO阈值电压，并可由外部电阻设置其他阈值电压。该器件适用于-40°C至+85°C的温度范围，采用低轮廓10引脚2x2mm TDFN封装。

2016/12/10 - SILICON LABS - 技术文档 - Rev. 1.0 代理服务技术支持采购服务

思瑞浦（3PEAK）模拟产品选型指南

目录- 线性产品接口产品隔离器件数据转换器线性稳压器与基准电源监控驱动器 DCDC 电池管理

型号- TPC112S8,TPM815202,TPM815201,TPP363070Q,TPM815203,TPW3125,TPP206080,TPP206081,TPA5582Q,LMV321TP,TPA1285,TPT1051HV,TPV8368Q,TPC112S1,TPT7730F,TPT7742F,TPA1286,TPA5522,TPC112S8U,TPA5521,TPC112S4,TPL910A,TPP363071Q,TPC6240,LM324A,TPW3111,TPW3115,TPH2865Q,TPL6305-S,TPA5571Q,TPL51201-S,TPV6823,TPA6551N,TPA5512,TPT7731F,TPA5511,TPW3221,TPW3223,TP8485E,TPA183,TPM1525,TPC51701,TPT7740F,TPCMP251,TPCMP252,TPT1057VQ,TPL9308-S,TPS42Q20Q,TPW4425,TPQ80302,TPA5581N,TPA1295,TPA191,TPC5120,TPC5121,TPT7741F,LM2903D,TPT7710F,TPT1462VQ,TPT7722F,TPW3188Q,TPC2192,TPC2190,LM339A,LM2903A,TPM81520,TPL8651Q,TPM23513,TPC114S1,TPA5601,TP1562AL1-S,TPL9305-S,TPH2861Q,LM2904A,TPS42S40Q,TPM2025Q,TPS14P50,TPA2681,TPA2682,TPT3232E,TPL51200,TPM8837C,TPL51206,TPL910Q,TPM0596,TPM27524Q,TPP364092Q,TPC2160,TPC2161,TPA5621,TPM8837E,LMV324TP,TPT7720F,TPP2020,TPT7721F,TPL9053-S,TPM6501Q,TPM2015Q,TPL8033,TPL9208-S,TPL8652Q,LMV358TP,TPL8151,TPL8031,TPL51200-S,TPL8032,TPW4051,TPW4053,TPW4052,TPW4054,TPT1042VQ,TPT1255,TPL9052,TPL9053,TPT1256,LMV324B,TPA2644,TPP362072Q,TPA2641,TPA2642,TPQ50551Q,TPW4157,TPT485E,TP1561AL1,TPM6505Q,TPT485N,TPB4056A,TPB4056B,TPA2671,TPA2674,TPA2672,TPL9032,TP6001,TPP302080,TPA1882Q,TPP302085,TPP302084,TP6004,TPP302083,TPP302082,TP6002,TPP302081,TPM44273,TPB76200,TPT72616,TPT72617,TP17,TPT1044VQ,LMV331X,TPT1330,TPA8001-S,TPT1337,LM2901A-S,TPA1882,TPT1334,TPA1881,TPR6040,TPCMP271,TPCMP272,TPM6505,TPM2025,TPM8803,TPM6501,TP1564AL1-S,TPP363072Q,TP2191,TPTMP75,TPQ50571Q,TPP362071Q,LMV321B,TP5594,TP5592,TP5591,LMV358X,TP27,TPT1029Q,TP1562AL1,TPM2003,LMV358B,TPM2001,TPP362070Q,TPS05P50,LM2903DQ,LM2902A-S,TPA8000,TPT1028Q,TPA8002,TPA8001,TPP366091Q,TPQ5055Q,TPM23513B,TPM27517,TPA8003-S,TPP366090Q,TPM27533,TPP362083,TPP362084,TP1564AL1,TPP362085,TPA1831,TPT481,TPQ5057Q,TPA1832,TPT480,TPV710Q,TPP362080,TPM23514D,TPR434-S,TPP362081,TPT482,TPP362082,TPM27523,TPM27524,TPM27525,TPA1834,TPM27526,TPT488,TPL8032Q,TPT487,TPT486,TP2272,TPL740,TP2271,TPA8023,TPP60506,TPP60508,TPA626,TPAFE0808,TP2274,TPP361082,TPT1462Q,TPP361083,LM393A,TPA1864,TPA1862,TPP361080,TPA620,TPP361081,TPL8035Q,TPV8318,TPT9H111,TPA1861,TPT7730,TPT7731,LM2903A-S,TPL730,TPR70,TP5554,TPC2161M,TP5552,TP5551,TPR433-S,TPA7836B,TPV8308,TPL8034Q,TPT9H221,TPT7740,TPA8003,TPT7741,TPT7742,TPM215202,TPM215201,TP1282,TP1281,TPL720,TPL6305,TPP361064,TPM27201,TPP361065,TP1284,TPP361060,TPT1145Q,TPT1024Q,TPP361061,TPP361062,TPP361063,TPM215203,TPT7710,TPR6040-S,TP2261,TPL710,TPP00032,TPP00031,TP5534,TP1561AL1-S,TP5532,TP2262,TP5531,TPL8151-S,TPR433Q-S,TP2264,TPT7722,TPR50,TPT7720,LM2904A-S,TPT7721,TPM23514S,TPA8101,TPM5350MQ,TPP60308,TPL910A-S,TPL820,TP2112,TPK1032,TPM27224,TPM23514M,TPK1031,TPH2502,TPR434Q-S,TPH2501,TP2111,TPH2504,TPH2503,TPT1022Q,TPM27221,TPH2861,TPP05608,TPR33-S,TPM27217,TPL8031Q,TPM23514V,TPM21520Q,TPW4066,TPA6270,TPL810,TPA6271,TPL930,TP2124,TPT1057Q,TPM8860,TP2122,TPT1021Q,TP2121,TPT1042,TPR31,TPT1043,TPR33,TPA1811,TPT1051VQ,TPA1812,TPM8866,TPL8151Q,TPR35,TPA6581,TPA6582,TPC116S4,TPV708,TPV706,TPL920,TPA2031Q,TPC116S8,TPAFE51736S8,TPW1221,TP1242,TP1241,TPT1044Q,TPT4089,TPT71050,TPQ051007,TPP364090Q,TPC116S1,TPC502200,TPT7481,TPT7482,TPL9052-S,TPL910,TP2582,TP2581,TP2584,TPT1043Q,TPM5350BS,TPT1042V,TPM5350S,TPP364091Q,TPV821,TPT7487,TPT7488,TPM5350M,TP2262-S,TPM5350BM,LM2901A,TPV809,TPCMP761,TPCMP762,TPCMP764,TPV803,TPT1042Q,TPT4181,TPL9218-S,TPB7461,TPB7462,TPB7460,TPV811,TPV812,TPV810,TPQ05100,LM2902A,LMV393X,TPT71044,TPW3157A,TPA6584,TPM27282,TPAFE5162,TPC5180,TPAFE5161,TPAFE5160,TPT10283Q,TPAFE51760,TPP363080,TPP363081,TPT75176B,TPP363082,TPP363083,LM331A,TPT75176H,TPA2296,TPR431,TPA6534,TPR432,TPA5561,TPA5562,TPT75176A,TPA6531,TPA6532,TPT1051H,TPT1051Q,TPT9L484,TPT1145NQ,TPA6531N,TPAFEA008,TPC5121Q,TPC5160,TPC5161,TPT10285Q,TPM16050,LM321A,TPA5572Q,TP07A,TPA2295C,TPL8032-S,TPA6551,TPA6552,TPA6554,TPL5031,TPA5581,TPA5582,TPQ051004,LM358A,TPQ051003,TPQ051006,TPP366092Q,TPQ051005,TPQ051002,TPM21520,TPT4032,TPA5561Q,TPT4031,TPR431-S,TPM2803,TPC5120Q,TPV8348

2024/4/19 - 思瑞浦 - 选型指南 - REV.17 代理服务技术支持采购服务

思瑞浦（3PEAK）运算放大器选型表

思瑞浦（3PEAK）高性能运算放大器，精密运算放大器：失调电压低至5uV，温漂低至0.008uV，支持双电源供电。低噪声运算放大器：噪声系数低至0.1μVpp/Hz，适用于低噪声系统应用。超低功耗运算放大器：功耗低至300nA，轨到轨输出，适用于电池供电产品。超低功耗比较器：功耗低至300nA。负载驱动电流25mA，适用于便携式设备。

Iq per channel (Max)(μA)

Offset Drift(Typ)(μV/°C)

Ib(typ)(pA)

Vn (Typ) (nV/rtHz)

Peak Noise at 0.1 to 10Hz(μVpp)

Operating Temperature Range(°C)

选型表 - 思瑞浦立即选型

思瑞浦（3PEAK）数据转换器选型表

高精度DAC/ADC：4~24Bit DAC,DNL小于正负1 LSB，兼容标准的SPI、QSPI、MICROWIRE总线方式。数字式电流/功率监测器：12/16bit，在整个工作温度范围内保证无失码。多通道可配置模数/数模转换器：集成4/8/12通道12bit ADC的可灵活配置的数模/模数转换芯片。

Throughput Rate(Msps)

INL

Offset Error(LSB, Max)

选型表 - 思瑞浦立即选型

思瑞浦（3PEAK）接口产品选型表

RS-485：支持 3V/5V 、半双工、有极性和无极性的 RS-485/-422收发器，最高速速率20M，支持1.8V IO,省去电平转换电路，形成单芯片解决方案。RS-232：单电源供电的 RS-232通信接口芯片,低功耗、高数据速率、外围电路简单。CAN：±30V共模电压，8K ESD CAN收发器。电平转换：I2C电平转换，热插拔缓冲器及IO扩展芯片。MLVDS：4路LVDS接收器，传输速率最高可达400Mbps。

IQ(Typ.)(1 Channel)(μA)

Ron(Ω)