9/16/2023 0 Comments Sg3525 compensation calculator![]() ![]() If the input voltage is 22V, output voltage is 15V and load current is 1A we can do a quick calculation. For example, if we assume for a moment that the switching regulator is 100% efficient (no losses at all), the power output must equal the power input. ![]() With any linear regulator, the losses are dissipated as heat, and there is no way to get rid of it other than by using a heatsink.Ī switching regulator will have far fewer losses, but more importantly, they also provide a transformation of input and output power. At higher currents, the losses become far greater. For low currents this isn't a problem - a preamp power supply may only draw 100mA or so at most, so the dissipation will be 700mW and a small heatsink is all that's needed. A linear regulator with an input voltage of 22V DC and an output voltage of 15V will dissipate 7W for each amp drawn by the load. Where a linear supply transformer needs to operate from 50Hz or 60Hz mains, the switching equivalent typically operates at 25kHz or more, so it's a lot smaller.įor regulators, the saving is in the heatsink. While the circuit complexity is far greater, there are significant savings to be made with the transformer in particular. The linear power supply is far from dead, but in commercial products switchmode power supplies (SMPS) and switching regulators have pretty much taken over. ![]()
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