Other Parts Discussed in Thread: TL494, TL2842, LM5021, PMP30276
I made a post below.
https://e2e.ti.com/support/power_management/isolated_controllers/f/188/t/662888
Based on this post I proposed UCC 28740 to the customer, but I got additional questions.
I will write down the question items below, so can you teach?
About how to use UCC28740.
①: Although it is described that the frequency always fluctuates depending on the current value of the IFB, is it possible to use the switching frequency fixed at 100 kHz?
②: Can you respond to the following specifications?
Input: 154 to 480 V @ AC
Output: 24 V, 0.1 A @ TYP ⇔ 0.5 A. (10 ms / 1s)
Fsw: Fixed to 100 kHz (tolerance ± 10%)
③: When the protection function was appling, is latch protection type or temporary stop type?
④: What kind of function is "Low-Line" of protection function?
⑤-1: Is the correct my recognition with the following about the power supply startup related to the VDD pin?
First, start up by supplying VDD using the voltage of the primary side power supply.
Next, when the secondary side output is made, this voltage is supplied and operated.
⑤-2: Also, based on this operation VDD_on is not recognized if it does not become 21V@TYP more, Is my recognition correct ?
⑥: I felt it severe to respond to the contents of ①~⑤ with UCC28740.
I think that TL494 or TL2842 is good as one that can correspond to this content and can be constructed inexpensively, but is there any other good device?
Best regards,
Pokkun (Masumi Sekiguchi)