TPA1285

TPA1285 3PEAK | Alldatasheet

Document overview

• Manufacturer or author: Provided By alldatasheet.com(free datasheet download site)
• PDF pages: 11

Technical content

Features

◼ VOLTAGE OFFSET: ±100uV (MAX) ◼ WIDE COMMON MODE VOLTAGE: 3.0V to +76V ◼ SUPPLY VOLTAGE: 3.0V to +5.5V ◼ ACCURACY and ZERO-DRIFT PERFORMANCE ◆ ±0.5% Gain Error (Max over temperature) ◆ 0.4μV/°C Offset Drift (Max, -40°C ~125°C) ◆ 10ppm/°C Gain Drift (Max) ◼ THREE GAIN OPTIONS for VOLTAGE OUTPUT ◆ TPA1285T: 20V/V ◆ TPA1285F: 50V/V ◆ TPA1285H: 100V/V ◼ Rail-to-Rail Output ◼ Industrial –40°C to 125°C Operation Range ◼ ESD Rating: Robust 2.5kV – HBM, 1.5kV – CDM

Applications

◼ CURRENT SENSING (High−Side) ◼ BATTERY CHARGERS ◼ POWER MANAGEMENT ◼ AUTOMOTIVE ◼ SERVER BACKPLANES ◼ BASE STATIONS & TELECOM EQUIPMENT ◼ INDUSTRIAL CONTROL AND AUTOMATION

Description

The TPA1285, high precision, high common voltage, 2 channel high -side current sense amplifier has very high precision accuracy specifications of Vos less than 100μV (max) and gain error less than 0.5 % (max). Three fixed gains are available: 20V/V, 50V/V, and 100V/V. The low offset of the zero- drift architecture enables current sensing with maximum drops across the shunt as low as 5mV full-scale. The TPA1285 features an input common -mode voltage range from 3.0V to 76V with 80kHz of small -signal bandwidth, which makes it ideal for small signal conditioning interfacing with a SAR ADC. The TPA1285 offers breakthrough performance throughout the −40°C to +125°C temperature range. It features a zero-drift core, which leads to a maxim offset drift of 0.4μV/°C throughout the operating temperature range and the common -mode voltage range. The TPA1285 is offered 8-pin MSOP package Functional Block Diagram TPA1285 IN1+ IN1- P RF1 OUT1 GND RG1 RG1 ILOAD1 VSENSE1 RSENSE1 IN2+ IN2- P RF2 OUT2 GND RG2 RG2 ILOAD2 VSENSE2 RSENSE2 Pin Configuration IN1+ V+ GND OUT2 OUT1TPA1285 MSOP 8 IN1- IN2+ IN2-

www.3peak.com Rev.A.3 TPA1285 High Precision, High Voltage, 2ch Current Sense Amplifier Table of Contents

Revision History

2019/10/15 Rev.Pre Initial Version 2020/12/11 Rev.A.0 Released Version 2021/9/22 Rev.A.1 Update format 2022/5/1 Rev.A.2 Update order information and package outline dimensions

www.3peak.com Rev.A.3 TPA1285 High Precision, High Voltage, 2ch Current Sense Amplifier 2022/8/14 Rev.A.3 Modify absolute input common voltage and current information Order Information Model Name Order Number Gain Package Transport Media, Quantity Package Marking TPA1285 TPA1285T-VR-S 20V/V 8-Pin MSOP Tape and Reel, 3,000 1285T TPA1285F-VR-S Note 1 50V/V 8-Pin MSOP Tape and Reel, 3,000 1285F TPA1285H-VR-S Note 1 100V/V 8-Pin MSOP Tape and Reel, 3,000 1285H Note 1: Future product, contact 3PEAK factory for more information and sample. Absolute Maximum Ratings Note 2 Input Common Voltage (Survival)……………. –0.5 to 100V Note 2: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 3: The inputs are protected by ESD protection diodes to each power supply. If the input extends more than 500mV beyond the power supply, the input current should be limited to less than 10mA. ESD, Electrostatic Discharge Protection Thermal Resistance Package Type θJA θJC Unit 8-Pin MSOP 210 45 °C/W Symbol Parameter Condition Minimum Level Unit HBM Human Body Model ESD ANSI/ESDA/JEDEC JS-001 2.5 kV CDM Charged Device Model ESD ANSI/ESDA/JEDEC JS-002 1.5 kV

www.3peak.com Rev.A.3 TPA1285 High Precision, High Voltage, 2ch Current Sense Amplifier

Electrical Characteristics

The specifications are at TA = 25°C, VSENSE = VIN+ – VIN– = 1mV, V+ = 3.3 V, VIN+ = 76V, unless otherwise noted Symbol Parameter Conditions Min Typ Max Unit INPUT VOS Input Offset Voltage -40°C to 125°C ±10 ±100 uV VOS TC Note 4 Input Offset Voltage Drift -40°C to 125°C 0.4 μV/°C VCM Common-mode Input Range -40°C to 125°C 3.0 76 V CMRR Common Mode Rejection Ratio -40°C to 125°C, 3.0V < V+ < 76V 110 125 dB IB Input Bias Current -40°C to 125°C 65 uA IOS Input Offset Current -40°C to 125°C 1.1 uA PSRR Power Supply Rejection Ratio 3.0V < V+ < 5.5V 100 dB NOISE RTI Note 5 en Input Voltage Noise Density f = 1kHz 40 nV/√Hz OUTPUT G Gain TPA1285T 20 V/V TPA1285F 50 V/V TPA1285H 100 V/V GE Gain Error -40°C to 125°C ±0.1% ±0.5% GE TC Gain Error Vs Temperature -40°C to 125°C 3 10 ppm CLOAD Maxim capacitive load No oscillation 1 nF VOH Output Swing from Supply Rail -40°C to 125°C, Source 500uA 0.008 0.030 V VOL Output Swing from Supply Rail -40°C to 125°C, Sink 500uA 0.002 0.015 V FREQUENCY RESPONSE BW Bandwidth All Gain Configuration 60 kHz SR Slew Rate 0.6 V/μs POWER SUPPLY V+ Supply Voltage 3.0 5.5 V IQ Quiescent Current 750 1000 μA TEMPERATURE RANGE Specified range -40 125 °C Operating range -55 150 °C Note 4: Maxim specification is calculated with limited sample quantity in laboratory. Note 5: RTI = referred to input.

www.3peak.com Rev.A.3 TPA1285 High Precision, High Voltage, 2ch Current Sense Amplifier Typical Performance Characteristics The TPA1285 is used for characteristics at TA = 25°C, VSENSE = VIN+ – VIN– = 1mV, V+ = 3.3V, VIN+ =76V, unless otherwise noted

www.3peak.com Rev.A.3 TPA1285 High Precision, High Voltage, 2ch Current Sense Amplifier

www.3peak.com Rev.A.3 TPA1285 High Precision, High Voltage, 2ch Current Sense Amplifier SMALL SIGNAL RESPONSE LARGE-SIGNAL RESPONSE SATURATIONRECOVERY RESPONSE

www.3peak.com Rev.A.3 TPA1285 High Precision, High Voltage, 2ch Current Sense Amplifier Pin Functions IN1-: Inverting Input of the Amplifier1. IN1+: Non-Inverting Input of Amplifier1. IN2-: Inverting Input of the Amplifier2. IN2+: Non-Inverting Input of Amplifier2. OUT1: Amplifier1 Output. OUT2: Amplifier2 Output. V+: Positive Power Supply. Typically, the voltage is from 3.0V to 5.5V. A bypass capacitor of 0.1 μF as close to the part as possible should be used between power supply pin and ground pin. GND: Negative Power Supply. Operation Overview The TPA1285 family is a high voltage power supply, zero drift, 2 channel difference amplifier that use s unique architecture to accurately amplify small differential current shunt voltages, especially for fast changing common -mode voltages. In typical applications, the TPA1285 family measures current by amplifying the voltage across a shunt resistor connected to its inputs by 3 gains of 20 V/V, 50V/V and 100V/V. Applications Information Application schematic VCM= 3V To 76V VCM= 3V To 76V VDD=3V TO 5.5V RSENSE1 ISENSE1 RSENSE2 ISENSE2 LOAD 1 LOAD 2 IN1+ IN1- IN2+ IN2- VDD OUT2 OUT1 GND R1 R2 R2R1 MCUTPA1285 Selecting Rsense The zero -drift offset performance of the TPA1285 offers several benefits. Most often, the primary advantage of the low offset characteristic enables lower full-scale drops across the Rsense. For example, non-zero-drift current sense monitors typically require a full-scale range of 100 mV. The TPA1285 family gives equivalent accuracy at a full -scale range on the order of 5~10 mV. This accuracy reduces Rsense dissipation by an order of magnitude with many additional benefits. Alternatively, there are applications that must measure current over a wide dynamic range that can take advantage of the low offset on the low end of the measurement. Most often, these applications can use the lower gains of the TPA1285 to accommodate larger Rsense drops on the upper end of the scale.

www.3peak.com Rev.A.3 TPA1285 High Precision, High Voltage, 2ch Current Sense Amplifier Recommended Component Values Ideally, the maximum load current develops the full-scale sense voltage across the current-sense resistor. Choose the gain needed to match the maximum output voltage required for the application: Vout = Vsense x Av Where Vsense is the full-scale sense voltage, and Av is the gain of the TPA1285. In applications of monitoring a high current, ensure that Rsense is able to dissipate its own I 2R power loss. If the resistor’s power dissipation exceeds the nominal value, its value may drift, or it may fail altogether. The TPA1285 senses a wide variety of currents with different sense-resistor values. Power Supply Recommendation The input circuitry of the TPA1285 can accurately measure beyond its power-supply voltage, V+. For example, the V+ power supply can be 5V, whereas the load power-supply voltage can be as high as 76V. However, the output voltage range of the OUT pin is limited by the voltages on the power-supply pin. Proper Board Layout To ensure optimum performance at the PCB level, care must be taken in the design of the board layout. Poor routing of the current sensing resistor can result in additional resistance between the input pins of the amplifier. Any additional high -current carrying impedance can cause significant measurement errors because the current resistor has a very low value. Below is recommended connection to connect to the device input pins. This connection ensures that only the current-sensing resistor impedance is detected between the input pins. ILoad1 CAP OUT1 VIA to Ground Plane GND IN1- IN1+ OUT1 V+ 1 IN2+IN2- OUT2 RSense Vcm 3V to 76V OUT2 RSense Vcm 3V to 76V VIA to Ground Plane ILoad2 TPA1285 The use of a ground plane is highly recommended. A ground plane reduces EMI noise and also helps to maintain a constant temperature across the circuit board.

www.3peak.com Rev.A.3 TPA1285 High Precision, High Voltage, 2ch Current Sense Amplifier Package Outline Dimensions MSOP-8

www.3peak.com Rev.A.3 TPA1285 High Precision, High Voltage, 2ch Current Sense Amplifier IMPORTANT NOTICE AND DISCLAIMER Copyright© 3PEAK 2012-2023. All rights reserved. Trademarks. Any of the 思瑞浦 or 3PEAK trade names, trademarks, graphic marks, and domain names contained in this document /material are the property of 3PEAK. You may NOT reproduce, modify, publish, transmit or distribute any Trademark without the prior written consent of 3PEAK. Performance Information. Performance tests or performance range contained in this document/material are either results of design simulation or actual tests conducted under designated testing environment. Any variation in testing environment or simulation environment, including but not limited to testing method, testing process or testing temperature, may affect actual performance of the product. Disclaimer. 3PEAK provides technical and reliability data (including data sheets), design resources (including reference designs), application or other design recommendations, networking tools, security information and other resources "As Is". 3PEAK makes no warranty as to the absence of defects, and makes no warranties of any kind, express or implied, including without limitation, implied warranties as to merchantability, fitness for a particular purpose or non -infringement of any third -party’s intellectual property rights. Unless otherwise specified in writing, products supplied by 3PEAK are not designed to be used in any life -threatening scenarios, including critical medical applications, automotive safety -critical systems, aviation, aerospace, or any sit uations where failure could result in bodily harm, loss of life, or significant property damage. 3PEAK disclaims all liability for any such unauthorized use.