This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

UCC28810: Doubt regrading a reference design - Application note SLUA 752

Part Number: UCC28810

Dear Sir / Madam,

                      Greetings of the day, I am George, a novice player in power electronics, currently learning about led drivers and circuits. While referring UCC28810's Application note SLUA752(70W Streetlight driver)

I have some doubt about a portion of circuits, I would like to know what is the function of those particular arrangement of components.

1. R21A , R21B ( 1 M ohm) L2,L3 (100uH)  I would like to know why a filter circuit after the Bridge ? What is function of that?

 2. D9A(1N4007), R38A(1M ohm) along with C19A, C20A(10uf,450V). Here I would like to know why the diode and resistor connected in parallel and the capacitor in series instead of using one 407uF 300/450V

Please find the link below or find the attachment

I would be grateful if anyone could explain me with the reason behind of using and also the functionality of the circuit

Thanks in Advance


George Thomas