[Theme Month] Why can’t carbon film resistors be used in switching power supplies?

tiankai001

[Theme Month] Why can’t carbon film resistors be used in switching power supplies? [Copy link]

Why can't carbon film resistors be used in switching power supplies? Instead, metal film resistors should be used?

chunyang

It is not impossible, but it is better to choose metal film resistors. The main reason is that metal film resistors have better temperature tolerance and impact resistance, and usually higher precision. Power supply circuits often mean high temperature, current impact, etc., and some places also have higher requirements for precision. Knowing the principles, you can flexibly choose according to technical indicators and cost control requirements.

maychang

It is not that carbon film resistors cannot be used in switching power supplies, but the performance of carbon film resistors is often not as good as metal film resistors.

tiankai001

maychang posted on 2018-5-17 14:49 It is not that carbon film resistors cannot be used in switching power supplies, but the performance of carbon film resistors is often not as good as that of metal film resistors.

Can you explain it in more detail?

maychang

tiankai001 posted on 2018-5-17 14:57 Can you explain it in detail?

The temperature tolerance and current impact resistance of carbon film resistors are not as good as those of metal film resistors. Carbon film resistors with the same power dissipation are often larger in size than metal film resistors, which is enough to show that the temperature tolerance of carbon film resistors is not as good as that of metal film resistors.

PowerAnts

Metal film is suitable for large resistance, sampling, DC; carbon film is suitable for large current and low frequency pulse