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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TI Devices (8)
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| ISO7640FM |
Quad-channel, 4/0, 150-Mbps, default output low digital isolator |
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| LM5160A |
LM5160A Wide Input 65V, 2A Synchronous Buck / Fly-Buck™ Converter |
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| LP2985-N |
150-mA, 16-V, low-dropout voltage regulator with enable |
Power management |
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| TS5A23157 |
5-V, 2:1 (SPDT), 2-channel analog switch |
Switches & multiplexers |
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| UCC28711 |
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CAD/CAE symbols
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Texas Instruments and Accelerated Designs, Inc. have collaborated together to provide TI customers with schematic symbols and PCB layout footprints for TI products.
Step 1: Download and install the free download.
Step 2: Download the Symbol and Footprint from the CAD.bxl file table.
Step 3: Open the .bxl file with the Ultra Librarian software.
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Both PCB footprints and schematic symbols are available for download in a vendor neutral format, which can then be exported to the leading EDA CAD/CAE design tools using the Ultra Librarian Reader. The reader is available as a (free download.).
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Technical documentation
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User guide (1)
| Title | Type | Size (KB) | Date |
| | PDF | 2507 |
30 Apr 2015
|
Selection guide (1)
| Title | Type | Size (KB) | Date |
| | PDF | 1772 |
04 Apr 2018
|
Design files (6)
| | 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
|
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