Leakage Current Measurement Reference Design for Determining Insulation Resistance
TIDA-00440
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Key Document

Description

This TI design provides a reference solution to measure Insulation Resistance up to 100MΩ. It has an on-board isolated 500Vdc power supply and an isolated signal conditioning circuit to measure the leakage current. This design is useful to find leakage due to insulation breakdown in transformer and motor windings.

Features
  • Leakage current measurement circuit with option for: Programmable Current Sense Amplifier and Switchable Shunt Resistors
  • Range of measurement: 0 to 100MΩ with accuracy of 5% (Un-calibrated)
  • Test voltage level derived from IEEE 43-2000 ("Recommended Practice for Testing
  • Insulation Resistance of Rotating Machinery")
  • On-board Isolated 500V Power Supply to  measure the insulation resistance
  • Provision for Calibration Resistor on board
  • Hardware support for Start-of-Frame Detect allows implement IEEE1588 PTP

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Schematic/Block Diagram

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Design Files

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TI Devices (8)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD13202Q2  12V, N ch NexFET MOSFET™, single SON2x2, 9.3mOhm  MOSFETs  Sample & Buy Not Available
INA225  36V, bi-directional current sense amplifier w/ four pin-selectable gain settings  Current sense amplifiers  Sample & Buy View Design Kits & Evaluation Modules
INA333  Low-Power, Zero-Drift, Precision Instrumentation Amplifier  Amplifiers  Sample & Buy View Design Kits & Evaluation Modules
ISO7640FM  Quad-channel, 4/0, 150-Mbps, default output low digital isolator  Isolation  Sample & Buy View Design Kits & Evaluation Modules
LM5160A  LM5160A Wide Input 65V, 2A Synchronous Buck / Fly-Buck™ Converter  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules
LP2985-N  150-mA, 16-V, low-dropout voltage regulator with enable  Power management  Sample & Buy View Design Kits & Evaluation Modules
TS5A23157  5-V, 2:1 (SPDT), 2-channel analog switch  Switches & multiplexers  Sample & Buy View Design Kits & Evaluation Modules
UCC28711  Constant-voltage, constant-current PWM with PSR, valley switching, NTC option, and 0-mV cable comp.  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD13202Q2 WSON (DQK)| 6 Download
INA225 Download Download
INA333 Download Download
Download Download
ISO7640FM Download Download
LM5160A Download Download
LP2985-N Download Download
TS5A23157 Download Download
Download -
Download Download
UCC28711 Download

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Technical documentation

See the Important Notice and Disclaimer covering reference designs and other TI resources.

User guides (1)
Title Type Size (KB) Date
PDF 2507 30 Apr 2015
Selection guides (1)
Title Type Size (KB) Date
PDF 1772 04 Apr 2018
Design files (6)
Title Type Size (KB) Date
ZIP 897 27 Mar 2015
ZIP 6588 27 Mar 2015
ZIP 288 27 Mar 2015
ZIP 248 27 Mar 2015
PDF 68 27 Mar 2015
ZIP 847 27 Mar 2015
Related Tools & Software

Design tools & simulation (1)

Name Part Number Tool Type
SPICE-based analog simulation program  TINA-TI  Simulation tools 

Models (3)

Title Category Type Size (KB) Date Views
TIDA-00440 Resistive Divider Approach Simulation TINA-TI Reference Design ZIP 28 KB 20 Mar 2018
TIDA-00440 Multiple Current Shunt Approach Simulation TINA-TI Reference Design ZIP 35 KB 20 Mar 2018
TIDA-00440 Single Current Shunt Approach Simulation TINA-TI Reference Design ZIP 27 KB 20 Mar 2018

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