UCC21222-Q1: UCC21222-Q1 for DC-DC converter

Shankar Kanki

Part Number: UCC21222-Q1
Other Parts Discussed in Thread: UCC21222, UCC21330, PMP40500

Tool/software:

Dear TI Team,
We are planning to use UCC21222 for our application, could you please confirm UCC21222 is suitable for our system and below are the our system specs.

Input Voltage: Min 20, Nom 37, Max 60Vtg
Output voltage : 30V +/- 0.2V
Output current: 60A continuous, peak 70A
Switching frequency :Min 100Khz, Nom 230Khz, Max 400Khz

Q1: Want to design above specs with Phase Shifted Full Bridge Topology
Q2: Want to design above specs with Buck-Boost converter ( Full Bridge) Topology
Q3: Will the UCC21222 support 100% PMW duty continuously ? If yes what is the max time duration for this?

Please share if you have any refer documents for 60A design.

Thank you!

over 1 year ago

0 Hiroki Honda over 1 year ago

TI__Expert 8686 points

Hi Shankar,

UCC21222 reference designs: https://www.ti.com/product/UCC21222?utm_source=google&utm_medium=cpc&utm_campaign=app-null-null-44700045336317392_prodfolderdynamic-cpc-pf-google-wwe_int&utm_content=prodfolddynamic&ds_k=DYNAMIC+SEARCH+ADS&DCM=yes&gad_source=1&gclid=EAIaIQobChMImPHY9YO2hgMVmnR_AB1H6SzHEAAYASAAEgJuyPD_BwE&gclsrc=aw.ds#reference-designs

Example reference design for 42A output: https://www.ti.com/tool/PMP40500

From the given system parameters, UCC21222 would be suitable for your system.

UCC21222 can support 100% duty cycle if an isolated bias supply is used for powering the high-side.

With currents that high, I do recommend looking into UCC21330: https://www.ti.com/product/UCC21330

This device is the newer generation of UCC21222 and features a more robust design as well as being more cost efficient.

Please feel free to ask additional questions below if needed.

Regards,

Hiroki

0 Shankar Kanki over 1 year ago in reply to Hiroki Honda

Prodigy 180 points

Hi Hiroki,
Thanks a lot for your reply.

Q1: UCC21222 can support 100% duty cycle if an isolated bias supply is used for powering the high-side.
=> Could you please share any reference documents on this? we could not understand how and where to supply isolated bias. If reference doc not able, could you please draw on any paper and do let us know.

Q2: UCC21330
=> Thanks for your suggestion on this, could you also confirm UCC21330 is also support 100% duty if yes, please share the reference/draft drawing how we can achieve on this.

Q3: UCC21330 operating frequency
=> Could you please confirm, UCC21330 is suitable for switching frequency from 10kHz to upto 500KHZ ?

Q4: UCC21330 Reference design
=> Could you please share any reference design using UCC21330 with higher current ( ~60A) ?

Q5:Example reference design for 42A output: https://www.ti.com/tool/PMP40500
=> Thanks to PMP40500, could you please confirm is this design applicable for our above shared specs? ( 30V, 60A) if not what are the changes we have to do ?

0 Hiroki Honda over 1 year ago in reply to Shankar Kanki

TI__Expert 8686 points

Hi Shankar,

Q1: Here is a reference design that uses isolated bias supplies: https://www.ti.com/tool/TIDM-1000

Q2: UCC21330 also supports 100% duty cycle if the dead time function is disabled. The reference design uses the wide body version of this dual channel gate driver, but the design should be similar.

Q3: Switching frequency is dependent on different factors such as the VDD voltage, gate resistance, and load specs. The device itself is capable of switching at those frequencies.

Q4: Currently there are no reference designs using UCC21330 (since it is a new release).

Q5: I would recommend to focus on component limitations and layout changes due to the higher current values.

Regards,

Hiroki

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UCC21222-Q1: UCC21222-Q1 for DC-DC converter