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[Data] WTI Blog October 2020

[Data] WTI Blog October 2020

Key points to consider in power supply design for DC-DC converter design, including avalanche testing of power MOSFETs!

This document summarizes the WTI blog of Wave Technology Co., Ltd., a "development and design promotion business" that addresses the shortage of engineers, from October 2, 2020, to October 30, 2020. It introduces topics such as "Important Ioff Function During Partial Power Down" from October 2, 2020, "Points to Consider in DC-DC Converter Design Power Supply Design" from October 7, 2020, and "What is the Avalanche Test of Power MOSFETs?" from October 30, 2020. Additionally, it includes a wealth of useful information related to products and industries. We encourage you to read it. [Contents (excerpt)] ■ October 2, 2020: Important Ioff Function During Partial Power Down ■ October 6, 2020: Steps in Circuit Board Design and the Joys of a Second-Year Engineer! ■ October 7, 2020: Points to Consider in DC-DC Converter Design Power Supply Design Part 2 ■ October 8, 2020: Features of Switching Power Supply Circuit Methods ■ October 9, 2020: Reasons Why OTA Implementation in IoT Devices is Surprisingly Slow *For more details, please refer to the PDF document or feel free to contact us.

  • Other contract services
  • Embedded system design service
  • Circuit board design and manufacturing

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[Data] Shirutoku Report No. 52 #Avalanche Test (1)

[Data] Shirutoku Report No. 52 #Avalanche Test (1)

Avalanche surrender, UIS test circuits and waveforms, etc.! An explanation of the avalanche tolerance testing of power MOSFETs.

★★Shirutoku Report: Useful Information You Should Know★★ The avalanche rating measured in avalanche testing refers to the amount of energy that a power device can withstand before it begins to conduct current rapidly and ultimately fails when a voltage exceeding its breakdown voltage is applied. This report explains avalanche breakdown, UIS test circuits, and waveforms using diagrams. To verify whether there are any issues in the event that the device enters avalanche mode, it is necessary to investigate the avalanche rating of power MOSFETs when designing power electronics circuits. [Contents] ■ Image of avalanche breakdown ■ Test circuit and waveform for measuring avalanche rating *For more details, please refer to the PDF document or feel free to contact us.

  • Other measurement, recording and measuring instruments
  • Other contract services
  • Contract Inspection

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[Data] Shirutoku Report No. 53 #Avalanche Test (2)

[Data] Shirutoku Report No. 53 #Avalanche Test (2)

Explaining the transient thermal resistance of devices using diagrams! Calculations will be performed using a MOSFET with appropriate parameters as an example.

★★Shirutoku Report: Useful Information You Should Know★★ This report is a continuation of the avalanche rating test of MOSFETs discussed in Shirutoku Report No. 52. We will explain the relationship between the device's transient thermal resistance and the losses and time during avalanche operation using diagrams and graphs. When selecting a device, comparing devices measured under different conditions is not very meaningful. It is recommended to measure in an environment as close to actual operation as possible, rather than relying solely on data sheet values. 【Contents】 ■ Transient thermal resistance of the device ■ Relationship between losses and time during avalanche operation ■ Graph of Tj and time *For more details, please refer to the PDF document or feel free to contact us.

  • Other measurement, recording and measuring instruments
  • Other contract services
  • Contract Inspection

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[Information] Shirutoku Report No. 99 #About SiC MOSFETs

[Information] Shirutoku Report No. 99 #About SiC MOSFETs

The performance of MOSFETs is compared using a performance index called FoM! Measurement conditions vary by manufacturer.

★★Shirutoku Report: Useful Information You Should Know★★ SiC MOSFETs have the characteristic of high voltage resistance compared to Si, while also having low resistance. Leveraging this feature, many products are seen replacing high-voltage IGBTs with SiC MOSFETs. This time, I would like to talk about MOSFETs. If you want to know about SiC diodes, please refer to Shirutoku Report No. 12. 【Contents】 ■Comparison examples of Si-MOSFET, IGBT, and SiC-MOSFET ■Do not compare only based on ON resistance ■When replacing with SiC, be careful to change the drive voltage as well *For more details, please refer to the PDF document or feel free to contact us.

  • diode

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[Information] Shirutoku Report No. 106 # Introduction to Principle Verification

[Information] Shirutoku Report No. 106 # Introduction to Principle Verification

Check if only a specific function performs as intended! Here is a simple example.

★★Shirutoku Report: Useful Information You Can Benefit From★★ At WTI, we conduct design and development tailored to our customers' needs, and this time we will discuss principle verification. Here, principle verification refers to the confirmation of basic operations and characteristics before starting the full-scale product design. When there is a request for new development and it is believed that there may be technical challenges, we may suggest starting with principle verification. [Contents] ■ About Principle Verification ■ Confirmation of whether the MOSFET for inrush current prevention functions as intended *For more details, please refer to the PDF document or feel free to contact us.

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