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NCV8876 - Automotive Start-Stop Boost Controller

Mike Donnelly
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Mike Donnelly

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Original member of the PartQuest Explore development team. Modeling and Applications Specialist

Description

This example shows the performance of an ON Semiconductor NCV8876 Automotive Grade Start-Stop Boost Controller:http://www.onsemi.com/pub_link/Collateral/NCV8876-D.PDFFor vehicles with Start-Stop capability, the engine (ICE) is turned off during idle periods, for the purpose of fuel economy. But low-voltage nuisance drop-out of key electronic functions must be avoided during engine re-start. The NCV8876 is designed specifically for this purpose. It uses current-mode control, with many integrated functions to reduce the complexity of the external boost circuit.Simulation results show the output to the load during battery drop-out and recovery. Note that in this application, the output voltage (dark blue waveform) is maintained above 6.4V during the drop-out transient, and regulates at 6.8V during sustained low voltage (4V) battery operation (orange waveform).This circuit also demonstrates the value of soft-saturation inductor components from Coilcraft:http://www.coilcraft.com/pdfs/Doc1140_Beyond_the_data_sheet_Part1.pdfThe load current for the XAL4030-332 inductor in this application is 4A during nominal 12V operation. But during boost operation, the current reaches 6.6A peak (light blue waveform). This could saturate a typical inductor if it were sized for the nominal load, resulting in a collapse of the effective inductance. But notice that the actual instantaneous inductance (green waveform) only drops to 2.2uH, for this nominal 3.3uH part. This relatively small percentage drop in inductance can easily be accommodated by the converter design.

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AC-DC Power Adapter With Current Boost Regulator

Darrell
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Darrell

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Big fan of VHDL-AMS

Description

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Submitted by FurqanAziz on 26 Nov 2015 | 03:36 PST

Excellent Model

Submitted by yobenerehinzams on 6 Mar 2016 | 07:12 PST

materials

Submitted by DTMai on 16 Jun 2016 | 21:15 PDT

hello , and thanx a lot .
I just want to ask you about the mechanism of the current transformer .
Vielen dank

Submitted by Darrell on 24 Jun 2016 | 17:44 PDT

What would you like to know about the transformer?

Submitted by DTMai on 26 Jun 2016 | 12:26 PDT

i am not sure , how I can that simulate . current Transformer and particularly Voltage transformer . thank you again . VG

Submitted by Darrell on 26 Jun 2016 | 21:10 PDT

Find transformer-related designs by looking for tags:

http://systemvision.com/tags/transformer

You might find it helpful to look at online resources for transformer theory. Try this site:

http://www.allaboutcircuits.com/textbook/alternating-current/chpt-9/mut…

Darrell

Submitted by DTMai on 27 Jun 2016 | 02:56 PDT

thanx a lot .

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Copy of NCV8876 - Automotive Start-Stop Boost Controller - on Tue, 11/28/2023 - 15:28

User-1696090366
Designer249891

User-1696090366

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Welcome to the community!!

Description

This example shows the performance of an ON Semiconductor NCV8876 Automotive Grade Start-Stop Boost Controller:

http://www.onsemi.com/pub_link/Collateral/NCV8876-D.PDF

For vehicles with Start-Stop capability, the engine (ICE) is turned off during idle periods, for the purpose of fuel economy. But low-voltage nuisance drop-out of key electronic functions must be avoided during engine re-start. The NCV8876 is designed specifically for this purpose. It uses current-mode control, with many integrated functions to reduce the complexity of the external boost circuit.

Simulation results show the output to the load during battery drop-out and recovery. Note that in this application, the output voltage (dark blue waveform) is maintained above 6.4V during the drop-out transient, and regulates at 6.8V during sustained low voltage (4V) battery operation (orange waveform).

This circuit also demonstrates the value of soft-saturation inductor components from Coilcraft:

http://www.coilcraft.com/pdfs/Doc1140_Beyond_the_data_sheet_Part1.pdf

The load current for the XAL4030-332 inductor in this application is 4A during nominal 12V operation. But during boost operation, the current reaches 6.6A peak (light blue waveform). This could saturate a typical inductor if it were sized for the nominal load, resulting in a collapse of the effective inductance. But notice that the actual instantaneous inductance (green waveform) only drops to 2.2uH, for this nominal 3.3uH part. This relatively small percentage drop in inductance can easily be accommodated by the converter design.

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What's this?

You must be a registered user to add a comment.

ECU study for JSAE 2024 v2.0 (wo/ACT)

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Mike Donnelly
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Darrell
Designer10

User-1696090366
Designer249891

Masashi_Inaba
Designer220411

Masashi_Inaba
Designer220411

Masashi_Inaba
Designer220411

Masashi_Inaba
Designer220411

Masashi_Inaba
Designer220411

Masashi_Inaba
Designer220411

Masashi_Inaba
Designer220411