Question of isolated power product

UCC29950 is good for your application. Alternatively, UCC28056+UCC256301 can be used, which provides further higher efficiency and lower standby power from transtion mode operation, while UCC29950 provides more compact design along with CCM PFC. In this sense, CCM may be a bit over kill for your 168W design.

unless you describe why not resolve your problems, it is taken as your problems resolved. So only click not resolve does not help anything.

Thank you for your answer!


Do you know the board area(--㎡)?
And can you show the recommended circuit such as webench data including external parts value.

AC100V----------PFC----------LLC--------(Isolated)--------DC24V(3.5A) and DC12V(7A)--------

1.UCC29950
2. UCC28056 and UCC256301

We want to keep the board area below about 46200m㎡.


Best regards,
Takahiro Nishizawa

1. UCC29950, PMP11303, 300W, 200mm x 122mm = 24400 mm^2 < 46200 mm^2
2. UCC28056 and UCC256301, TIDA010038, 150W, 140mm x 55mm = 7700 mm^2 < 46200 mm^2

Thank you for your answer!

We checked the reference design PMP11303 and TIDA0100038.

Secondary is 2output(24V and 12V).

PMP11303 is two output.
TIDA0100038 is one output.

Please show the recommended cricuit about two output and board area.

Can you show the recommended circuit for our condition separately from circuit of these reference design(PMP11303 and TIDA0100038).
We want to know the customized circuit for our condition such as webench.

Best regards,
Takahiro Nishizawa

These two ref designs show the power same or greater than what you need with areas much samller. We do not have a ref design the same as what you need. You need to contact your TI local sales office and request a reference design with specs you have.

Thank you for your answer!

We have questions about reference design TIDA-01557.
www.ti.com/.../TIDA-01557


(Question 1)
The output of this reference design is 1ch(12V).
But we want set two output(12V/7~7.5A and 24V/3.5~5.5A).
Standby power is 75mW or 100mW in reference design guide.
Does standby power increase when the output of secondary change from 1ch(12V) to 2ch(12V and 24V)?
We must keep standby power below 100mW.


(Question 2)
The device of secondary are UCC24612 x 2 , CSD18511Q5A x 2 , TLVH 431A when Vout is 12V.
But we want to set 2ch output.

Primary---
UCC28056---------------UCC256301-------coil

Secondary---
12V output : coil-------UCC24612 x 2 , CSD18511Q5A x 2 , TLVH 431A
24V output : coil-------UCC24612 x 2 , CSD18511Q5A x 2 , TLVH 431A

We have to set two isolated circuit when we use 2ch output.
Is this understanding correct?


Best regards,
Takahiro Nishizawa