Question: What kind of inductance is Lo in this power circuit?

Knight97538

Question: What kind of inductance is Lo in this power circuit? [Copy link]

Question: What kind of inductance is Lo in this power circuit? Isn't the symbol of industrial model inductance like this?

maychang

This thing is two windings with magnetic coupling, which can be regarded as a transformer. It is used to obtain an independent power supply from the Buck circuit outside the main circuit under certain conditions. Unlike the common mode inductor, the wire thickness of the two windings may not be the same, and the number of turns may not be the same. This is a special use of the Buck circuit.

tagetage

It is written on the chip's data sheet, read it carefully.

Knight97538

tagetage posted on 2024-6-6 16:57 It is written on the chip data sheet, read it carefully.

The manual says this

Knight97538

maychang posted on 2024-6-6 13:59 This thing is two windings with magnetic coupling, which can be regarded as a transformer. It is used to obtain a circuit other than the main circuit from the Buck circuit under certain conditions...

There are two windings with magnetic coupling, which can be regarded as a transformer

I don't know if it is the same as ordinary power inductors.

Does the circuit symbol look like a flyback transformer?

maychang

Knight97538 posted on 2024-6-7 14:54 There are two windings with magnetic coupling, which can be regarded as a transformer. I don’t know if it is the same as an ordinary power inductor. The circuit symbol can be used to see if it is a flyback transformer...

[I don't know if it is the same as ordinary power inductors]

Ordinary power inductors have only one winding, but here there are two.

maychang

Knight97538 posted on 2024-6-7 14:54 There are two windings with magnetic coupling, which can be regarded as a transformer. I don’t know if it is the same as an ordinary power inductor. The circuit symbol can be used to see if it is a flyback transformer...

[Is the circuit symbol a flyback transformer? ]

The circuit symbol is the same as that of a single secondary flyback transformer, but a flyback switching power supply transformer often has multiple secondary windings, so of course the circuit symbol is different.