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