L and Resistor R function in a SMPS output nearby/vicinity

[abdulbadii]

What is the Inductor L and Resistor R function in a SMPS output vicinity below after transformer T output ?

What are the two values supposed to be calculated with respect to each other and to the two capacitors i.e. C1 and C2||C3  ?

SMPS rated as output 24V  max 2.5 A
Please help elaborate the real mechanism crystal clearly !

[T3sl4co1l]

Impossible to tell without more design information; what output, what transformwer[sic]?

If this is like the output of a flyback, probably the L and C provide additional filtering, maybe the R is a leakage path so it discharges when off?

Tim

[Terry Bites]

I think it would be helpful to look at a mirror image of this diagram. Its conventional to show signal and power flowing from left to right.

A rectifier feeding into a smoothing cap and a pi section LC filter is a very common configuration.
see https://electronicscoach.com/pi-filter.html
L and C values are chosen to obtain the desired attenuation of the switching frequency.

I imagine the resistor creates a small load current.
Regulators will often not function correctly below a minimum load current.