Hi Support, Is there a schematic example for STWBC2-HP with single coil configuration? Regards, Samier

[SBelh.1]

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[Peter BENSCH]

Welcome, @Community member​, to the community!

the data sheet of the STWBC2-HP already contains two example circuits with single coil, see there page 4 and page 5.

Otherwise you will also find an example with multi-coil in the reference design STDES-50W2CWBC. There, two coils are controlled, but this can easily be reduced to one coil by leaving out one branch, i.e. e.g. the lower Qi coil, C410, C412, C415, Q408, Q409.

Does it answer your question?

Regards

/Peter

[SBelh.1]

Hi Peter,

Thanks for your reply.

Yes. But I have other questions:

1/ In this eval board https://www.st.com/en/evaluation-tools/stdes-50w2cwbc.html

you used variable frequency full-bridge configuration, right?

-What changes are required if I want to use fixed frequency configuration?

2/ If I want to use STWBC2-HP with qi1.3, I need to add Stsafe and NFC?

Is there others requirements?

3/ What is the efficiency of STWBC2-HP?

Thanks in advance,

Best Regards,

Samir

[SBelh.1]

Hi Peter,

Can you please answer me?

Regards,

Samir

[Peter BENSCH]

No, I cannot answer the other questions.

Regards

/Peter

[SBelh.1]

Why?

[SBelh.1]

Can you please check this with your colleagues?

[willzhou]

Dear customer

1/ In this eval board https://www.st.com/en/evaluation-tools/stdes-50w2cwbc.html
you used variable frequency full-bridge configuration, right?
-What changes are required if I want to use fixed frequency configuration?
A:Yes Full bridge, if you want to use fixed frequency, it need speical FW to support this.

2/ If I want to use STWBC2-HP with qi1.3, I need to add Stsafe and NFC?
Is there others requirements?
A: Yes, you need add STSAFE and update to lastest FW.

3/ What is the efficiency of STWBC2-HP?
A: It depend on RX and coil and system efficiency is about 85%.

For more information please refer to STWBC2-HP - Qi-compatible inductive wireless charger power transmitter for up to 100W applications - STMicroelectronics
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