I am looking for best device

PAN-M

Other Parts Discussed in Thread: UCC28910, UCC28740, UCC28911, UCC28C43

Dear all.

I am looking for best device about following spec.
Input : DC24V and about over DC141V (AC100V)
Output : DC3.3V/450mA, DC15V/10mA, DC-15V/10mA, DC24V/30mA
Isolation : I think Flyback.
I examined UCC28910(Primary side feedback), but is there not the problem with this device?

Do you have a reference schematic with this device or other devices for this specifications?

Regards,
PAN-M

over 8 years ago

0 Billy Long over 8 years ago

TI__Expert 4015 points

I am not sure what problem you are referring to. The UCC28910 is a good choice for this application, or the UCC28740 if you would prefer to use an opto coupled feedback solution.

0 PAN-M over 8 years ago in reply to Billy Long

Mastermind 8375 points

Thank you for reply.

Do you have sample circuit?

Regards,
PAN-M

0 Billy Long over 8 years ago in reply to PAN-M

TI__Expert 4015 points

Hi Pan-M,
The schematics below show the ICs deployed in multi output flybacks.
24V DC may be abit low for the UCC28910, the UCC28911 may work a little better.

The UCC28740 has a minimum turn on voltage of 23V so if your 24V can be below this voltage then this IC would probably not be suitable.

Another good option is the UCC28c4x (e.g. UCC28c43).

www.ti.com/.../tidrd34.pdf

www.ti.com/.../tidriy6.pdf

www.ti.com/.../tidrik2.pdf

www.ti.com/.../slurap1.pdf

Hope this helps
Thanks
Billy

0 PAN-M over 8 years ago in reply to Billy Long

Mastermind 8375 points

Hi Billy
UCC28911 can't work following design.
Transformer;
inductance : 700uH
Turn ratio (24V output) : 2.69:1
Turn ratio (12V output) : 5.38:1
Turn ratio (3.3V output) : 17.5:1
UCC28911 works over 36V(not 24V) the input voltage.

Our customer measured each output point.
12V and 24V set each 1mA load and chane 3.3V load.
result:
0ｍA：　3.46V　12.17V　24.74V
50ｍA：3.44V　15.00V　30.45V
100ｍA：3.39V　16.33V　33.17V
150ｍA：3.32V　17.09V　34.72V

Why do it not work from 24V?
Why is the output voltage not stable?

Regards,
PAN-M

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I am looking for best device