Leakage Current Measurement Reference Design for Determining Insulation Resistance

(ACTIVE) 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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Bill of Materials (BOM)

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TI Devices (8)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD13202Q2  N-Channel Power MOSFET, CSD13202Q2, 12V Vds, 9.3mohm Rdson4.5 (max)  MOSFETs  Sample & Buy Not Available
INA225  36V Pin Selectable-Gain, Bi-Directional, High-Speed, Voltage Output Current-Sense Amp  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  6kVpk Low Power Quad Channels, 150Mbps Digital Isolators  Isolation  Sample & Buy View Design Kits & Evaluation Modules
LM5160A  LM5160A Wide Input 65V, 2A Synchronous Buck / Fly-Buck™ Converter  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
LP2985-N  Micropower 150mA Low-Noise Ultra-Low-Dropout Regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules
TS5A23157  Dual 10-Ohm SPDT Analog Switch  Switches & multiplexers  Sample & Buy View Design Kits & Evaluation Modules
UCC28711  Constant-Voltage, Constant-Current PWM Controller with Primary-Side Regulation  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 -
ISO7640FM Download Download
LM5160A Download Download
LP2985-N Download Download
TS5A23157 Download Download
Download -
Download -
UCC28711 Download

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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 2507 30 Apr 2015 104
Selection guides (1)
Title Abstract Type Size (KB) Date Views
PDF 1596 04 Apr 2018 1,563
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 897 27 Mar 2015 25
ZIP 6588 27 Mar 2015 33
ZIP 288 27 Mar 2015 37
ZIP 248 27 Mar 2015 25
PDF 68 27 Mar 2015 20
ZIP 847 27 Mar 2015 89
Related Tools & Software

Development Tools (1)

Name Part Number Tool Type
SPICE-Based Analog Simulation Program  TINA-TI  Circuit Design & Simulation 

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 9 views
TIDA-00440 Multiple Current Shunt Approach Simulation TINA-TI Reference Design ZIP 35 KB 20 Mar 2018 9 views
TIDA-00440 Single Current Shunt Approach Simulation TINA-TI Reference Design ZIP 27 KB 20 Mar 2018 7 views

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