Vishay Synchronous Buck Regulator EV Board

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This reference board allows the user to evaluate the SiC461 (10 A), SiC462 (6 A), SiC463 (4 A), or the SiC464 (2 A) microBUCK® regulators for their features and functionalities. The board is configured for 4.5 V to 60 V input. Output is model dependent. The operating range may be modified by changing components such as the inductor, feedback resistor, and ripple injection networks.


The SiC46x family of microBUCK regulators is a wide input voltage high efficiency synchronous buck regulator with integrated high-side and low-side power MOSFETs. Its power stage is capable of supplying up to 10 A continuous current at up to 2 MHz switching frequency. These regulators produce an adjustable output voltage down to 0.8 V from 4.5 V to 60 V input rail to accommodate a variety of applications, including computing, consumer electronics, telecom, and industrial. SiC46x's architecture delivers ultrafast transient response with minimum output capacitance and tight ripple regulation at very light load. The device is stable with any type of output capacitor. The device also incorporates a power saving scheme that significantly increases light load efficiency. This board has UVLO capability on the input rail and a user programmable soft start.




- Single supply operation from 4.5 V to 60 V input voltage

- Adjustable output voltage down to 0.8 V

- Scalable solution

2 A (SiC464), 4 A (SiC463), 6 A (SiC462), 10 A (SiC461)

-Output voltage tracking and sequencing with pre-bias

start up

- ± 1 % output voltage accuracy at -40 °C to +125 °C

• Highly efficient

- 98 % peak efficiency

- 5 μA supply current at shutdown

- 250 μA operating current not switching

• Highly configurable

- Adjustable switching frequency from 100 kHz to 2 MHz

- Adjustable soft start and adjustable current limit

- 3 modes of operation, forced continuous conduction,

power save or ultrasonic

• Robust and reliable

- Output over-voltage protection

- Output under-voltage / short circuit protection with auto


- Power good flag and over temperature protection

• Design support tool

- PowerCAD online design simulation

- Inductor selection tool


Additional Information

User Manual

Important Dates

Enrollment Begin:July 16 2020

Enrollment Ends: August 18 2020

RoadTesters Selected: August 27 2020

Product Shipped: August 28 2020

RoadTesting Begins:Sept 4 2020

Reminder/Update Email: Oct 4 2020

Submit Reviews By: Nov 4 2020

*The element14 RoadTest Staff will send this reminder/update email.

**If a RoadTester is unable to meet the deadline, please notify the RoadTest Program Lead, , as soon as possible before the deadline.


deadline Nov 11 2020

- see his video review in the "Video Review" tab

Video ReviewUnsupported video URL format.
Terms and Conditions

RoadTest: Terms and Conditions

Vishay Synchronous Buck Regulator EV Board


These are the terms and conditions which govern the Vishay Synchronous Buck Regulator EV Board contest. This Contest requires participants to submit an application indicating their previous experience with this type of equipment/component, information on what they would do to test the equipment/component, and the applicant’s desire to post a thorough review of their experience with images, photos, or other supplemental materials. Participants will be required to meet the Conditions for Participation.  The winners of this RoadTest will receive the item(s) listed below. RoadTest Reviews are due no later than 60 days after the receipt of the item(s). No other prizes are offered.

The Principal terms of the Competition:

The following words and phrases are used in these terms and conditions and have the meanings given to them below.

(RoadTest or Contest)

Key dates:

Applications Close: midnight (GMT) on Aug 17 2020

Announcement of Winner (estimated): Aug 19  2020

Prize: Vishay Synchronous Buck Regulator EV Board

Additional Prizes: none

Competition Site:

Site or element14 Community:

Judges: members of the element14 community team chosen at the Organiser’s discretion.

Judging Criteria, All of the following which will have equal weighting:

· Demonstrated competence with the technologies including links or descriptions of past projects

· Qualifications as indicated by current job role and/or schooling/vocational training;

· A thorough description of how the prize would be tested;

· Likelihood that the Applicant will blog about the prize and provide a review on;

· Originality;

· Innovation.

Organiser: Premier Farnell plc (registered in England and Wales under company number 876412) whose registered office is at Farnell House, Forge Lane, Leeds, UK

Conditions for Qualification: in addition to meeting the requirements of these terms, all persons applying to take part in the Contest (each one an Applicant) must:

· Provide a RoadTest application describing what he/she would do if awarded the Prize including similar previous projects, product experience and qualifications

Terms: these terms and conditions which govern the Competition and to which the Organiser reserves the right to make changes from time to time and the latest version of these Terms from time to time will be posted to the Site.

  1. Eligibility
  2. Applications:
  3. Selecting Winners:
  4. Liability:
  5. General:

1.1 Save as set out in these Terms, the Contest is open to any natural or legal person, firm or company or group of natural persons or unincorporated body.

1.2 All Applicants must be aged at least 18 at the time of their application.

1.3 Applicants must not enter the RoadTest if doing so or taking part may:

1.3.1 cause the Organiser and/or themselves to be in breach of any agreement (including but not limited to any contract of employment) to which they are a party or in breach of any law, regulation or rule having the force of law to which the Organiser or the Applicant may be subject or any policy of the Organiser or the Sponsor;

1.3.2 Require the Organiser to obtain any licence, authorisation or permission to deal with the Applicant; or

1.3.3 Be in breach of any policy or practice of their employer. Some employers prohibit or restrict their employees from taking part in competitions such as these or receiving prizes under them and the Organiser respects those policies and practices.

The Organiser reserves the right to disqualify any Application made in breach of these Terms and to reject any Application which it reasonably believes may be or become in breach. The Organiser reserves the right to require evidence in such form as the Organiser may reasonably require of any Applicant’s compliance with any of these Terms and to disqualify any Applicant or Participant who cannot provide such evidence reasonably promptly.

1.4 Multiple applications are not permitted.

1.5 Applications may not be submitted by an agent whether acting on behalf of an undisclosed principal or otherwise.

1.6 The Contest is NOT open to:

1.6.1 Any person or entity who is a resident or national of any country which is subject to sanctions, embargoes or national trade restrictions of the United States of America, the European Union or the United Kingdom;

1.6.2 Any employee, director, member, shareholder (as appropriate) or any of their direct families (parents, siblings, spouse, partner, children) (“Direct Families”) of the Organiser and Sponsors; or

2.1 Each Applicant must fully complete and submit a RoadTest Application by the Application Close.

2.2 By submitting a Registration Form, each Applicant:

2.2.1 Authorises the Organiser to use his or her personal data (as defined in the Data Protection Act 1998) for the purposes of running and promoting the RoadTest;

2.2.2 Authorises the Organizer to copy, reproduce and publish their application should they be accepted as a Participant;

2.2.3 Will be deemed to have read, accepted and agree to be bound by these Terms. Applicants are advised to print and keep safe these Terms;

2.2.4 Authorises the Organiser to copy, reproduce and use the Application and/or Review for the purposes of the RoadTest and as otherwise contemplated by these Terms. The Organiser will not be responsible for any inaccuracy, error or omission contained in any reproduction or use of the Project Blogs.

2.2.5 Licenses the Organiser to use the intellectual property in the Project (IP) for the purposes of this Contest. As between the Applicant and the Organiser the IP remains owned by the Applicant.

2.2.6 Grants the Organiser the right to use his or her likeness, photographs, logos, trademarks, audio or video recordings without restriction for the purposes of Contest or the promotion of it or the Site;

2.2.7 Agrees to participate positively in all publicity surrounding the Contest;

2.2.8 Agrees to be responsible for all expenses and costs incurred by him or her in preparing for, entering and participating in the Contest (save for any expenses expressly agreed by the Organiser to be borne by it in these Terms);

2.2.9 Confirms that he or she owns all IP used in his or her application or Project or Blogs and indemnifies the Organiser from any claim by a third party that use of any material provided by an Applicant to the Organiser infringes the intellectual property rights of any third party;

2.2.10 Agrees not to act in any way or fail to act in any way or be associated with any cause or group which would have a negative impact on the reputation of the Organiser and/or the RoadTest.

2.3 All applications submitted to this RoadTest must meet the following criteria:

2.3.1 Applicants must be the author, creator and owner of the proposed review idea. Applicants must not submit someone else’s idea;

2.3.2 The proposed application must be reasonably achievable by the within the time constraints of the Contest;

2.3.3 Applications must not include or propose any of the following, the inclusion of which shall render any proposed application ineligible:

(a) Applications which relate to socially taboo topics, such as illicit drug use or sexual gratification;

(b) Applications that are or could reasonably be considered to be illegal, immoral, discriminatory or offensive as determined by the Organiser;

(c) Applications in relation to them which if accepted would infringe or breach any of the policies or terms of access or use of the Site.

2.4 No Application may contain any of the hazardous substances identified by Article 4 of Directive 2002/95/EC of the European Parliament on the Restrictions on the Use of Substances in Electronic and Electrical Equipment ("the Directive") or the use of such hazardous substances in the in any such Project must not exceed the maximum concentration values set out in the Directive.

3.1 Winners will be selected by the Organiser on the basis of the quality of his or her application and its adherence to these Terms.

3.2 The total number of Winners selected will be at least the minimum number set out above but the actual number is at the sole discretion of the Organizer and/or the Sponsor, if applicable.

3.3 The Organiser will use all reasonable efforts to announce the Winners via an update to the RoadTest page by the date listed above.

3.4 Winners agree to take part in all publicity which the Organiser or the Sponsor wishes to use to promote the RoadTest, the Products featured or other Contests with which the Organiser may be connected from time to time.

3.5 Details of the Winners may also be published in the media.

3.6 Winners are responsible for all applicable taxes, duties or other charges payable in relation to any prize.


4.1 The Organiser hereby excludes all and any Liability arising out of the Contest or the acceptance, use, quality, condition, suitability or performance of any Prize, even where that Liability may arise from the Organiser’s negligence.

4.2 Nothing in these Terms will affect any Liability of the Organiser for death or personal injury arising from its negligence, for breach of Part II of the Consumer Protection Act 1987 (in the event that any entrant is entitled to claim rights under the Consumer Protection Act 1987) or for any matter in relation to which it would be illegal for the Organiser to exclude or to attempt to exclude its Liability.

4.3 Subject to 4.2, neither the Organiser, any parent company nor any subsidiary of the Organiser or such parent company or any of their directors, officers and employees (together referred to in these terms and the ‘Associates’) makes any guarantee, warranty or representation of any kind, express or implied, with respect to this Competition or the Prizes potentially available under it. Neither the Organiser nor any of its Associates shall be responsible for any Liability that may arise out of or in connection with person’s participation in this Competition, the claiming, redemption or value of any prizes under it, the use or enjoyment of such prizes or any events or circumstances arising out of or in connection with any of them. Any implied warranties of condition, merchantability or suitability or fitness for purpose of any of them are hereby expressly excluded. Wherever used in these Terms, ‘Liability’ shall mean any and all costs, expenses, claims, damages, actions, proceedings, demands, losses and other liabilities (including legal fees and costs on a full indemnity basis) arising directly or indirectly out of or in connection with the matter concerned.

5.1 The RoadTest is organised and sponsored by the Organiser. The Organiser reserves the right to delegate all or any of its powers, rights and obligations arising in relation to the RoadTest to any Associate and certain such rights and powers are assumed by the Organiser on behalf of itself and each Associate. Reference to “Organiser” shall be deemed to include reference to each Associate.

5.2 The RoadTest may be terminated at any time if there are, in the sole opinion of the Organiser, an insufficient number of entries, or if the Applications are not of an appropriate standard for a competition of this nature. The Organiser has the right to cancel or suspend the RoadTest at any time due to circumstances outside its reasonable control.

5.3 The Organiser shall have the sole discretion to disqualify (without correspondence or right of appeal) any Applicant it considers to be adversely affecting the process or the operation of the RoadTest or to be in breach of these Terms or to be acting in a disruptive manner or with intent to annoy, abuse, threaten or harass any other Applicant or Participant.

5.4 The Organiser has the right to amend or add to these Terms from time to time. Revised Terms and Conditions will be posted on the Contest Site and it is a condition of entry to the RoadTest that Applicants agree to comply with these Terms and, if appropriate, such Terms as amended from time to time.

5.5 Headings are for convenience only and do not affect the interpretation or construction of these Terms and Conditions.

5.6 These Terms and the operation of the Contest shall be governed by and construed in accordance with English Law and any claim or matter arising under these Terms shall be subject to the exclusive jurisdiction of the English courts.

Comment List
  • I did not notice that! Hmph. It looks like with the multiple revisions of boards they have, it's not entirely clear what BOM corresponds to which ... thanks for bringing that up!


    - Gough

  • I also noticed the rather small terminal blocks. But the BOM I could find in he mentioned ZIP has them as 'Amphenol Anytek 20020327-D041B01LF'. The pin pitch fits to my board (3.84mm, not 5.08 as the On Shore ones). These are rated for 10A, and also can fit 1.5mm² solid wires at best (which is what you should use for 10A).

  • To all applicants.


    I think I made a mistake regarding the 5 additional roadtesters. The sponsor did not want to add 5 more roadtesters. Rather, it wanted to offer 5 extra kits to people for personal projects. I apologize to all. I guess I misinterpreted their request. So, I will be contacting the 5 people the sponsor requested today.


    If you have any questions, feel free to post a comment and I will respond promptly.


    Randall Scasny

    RoadTest Program Manager

  • When I try to access the provided URL (as of the time of posting the previous reply) at, I get incorrectly thrown to this URL:



    I was lucky as prior to this, I had downloaded the calculator and ran it a few times (macros required).


    It's a decent tool for offline use, but I find the Transim tool perhaps even more comprehensive although with its own quirks (error prompts regarding component values when it seems there is no real error, just a disagreement about units). The calculator you linked seems to be inductor related - the Transim tool can even calculate losses and break them down by category.


    Aside from that, Transim also manages to do simulations for load-step and power-up behaviour as well, although some tasks do take a bit of time to load or complete. My testing of efficiency is quite extensive (probably will be testing close to ~500k points, possibly more, which is going to take about a month of work) which is why I haven't posted my review just yet but so far, I'm pretty impressed to say the least by the numbers I'm getting so far. I'll leave the full reporting for the RoadTest review.


    - Gough

  •   wrote:



    They have an Excel-based component value calculator available (it's 404 now it seems), ...


    - Gough

    I get the calculator(edit - oops, not the setup efficiency calculator)


  • Indeed, this is the high power board, but it seems they want to make it some form of unified design for the SiC4xx devices.


    The file they make available has the correct V3 layout under the "PCB Fab Package High Power SiC461 SiC462" folder while the BOM seems to be in the "SiC461 12V 10A Rev A package" folder, which seemingly corresponds to the BOM given in the Reference Board User's Manual.


    They have an Excel-based component value calculator available (it's 404 now it seems), but even looking at the BoM for the three different boards, the inductors, feedback resistance (R12), switching frequency resistance, compensation resistance and ripple-injection resistances have changed for optimal results (perhaps regulation performance and efficiency wise). Of course, changing R12 alone would change the output voltage (keep it to <=25V as the provided output capacitors are rated to 25V only) but the converter will not be optimally configured. The difficulty is the small SMD chip (0603), the effective heat-sinking ability of the 6-layer board and location near other resistances, making it less convenient to change. I'm not going to attempt changing mine until I've concluded all testing on its default configuration as I fear I might break the board.


    Of note is that the soldering on my board was not great and even though the BOM claims that the test points are equipped with Keystone 5002 PCB test points in white, mine were not populated. Populating pins took a lot of attempts because my iron wasn't really heating it up enough to get a good joint formed.


    I agree that the terminal blocks are a bit on the wimpy side - my 10A-rated wire only barely fit into the terminals, but I've been running tests on a continuous basis up to just over 10A and nothing's melted yet. The terminal blocks are listed as On Shore Technology ED120/4DS 5.08mm Vertical 4-position terminals. The data online suggests this part has a 15A maximum current rating, which should be enough.


    - Gough

  • I got the same board. This should be the 'high power' version, whereas the picture above shows the 'low-power' version. Unfortunately most of the materials for the EVB only refer to the latter. I was able to track down a schematic for the high-power board, but failed to find a BOM so far (wanted to clarify whether the terminal blocks are actually rated for 10A, they look a bit whimpy).

    I think changing the feedback resistors should be enough to change the output voltage. Without touching anything else the efficiency will be a bit less that one could achieve with a more optimal solution, though.

  • Looks like more kits are available for RoadTest.


    Just a note - the kit I received was an SiC461 12V kit - meaning it is pre-configured for a 12V output. The reference design evaluation board also comes in 3.3V and 5.0V output varieties. Changing the output voltage (properly) requires quite a few component changes (R12 is just the beginning - it may work, but not optimally) and is tough to do given the small footprint and thermal load of the 6-layer PCB (I had a lot of fun just soldering in the test points - the Rev3 PCB is different from the one pictured and mine had no test pins/loops, just vias).


    Perhaps it's worth clarifying whether the kits you have are 3.3V, 5V or 12V output so that prospective RoadTesters can plan accordingly.


    - Gough

  • image

    A great find is all in the packaging!

  • Many thanks!

    The board arrived yesterday, and it surely looks nice. The packaging was a little bit on the generous side, though, I was actually wondering whether the UPS guy handed me the right package at first...