![]() ![]() I put 100Ω resistor as Rload because it is the one I use as actual load for the 3.3V output. All the components on the power circuit except the Rload resistor can be found on FIGURE A-3 of the DS50002762A document from microchip. The power circuit output level is inherently inversely proportional to the switching frequency of MOSFET Q6 while the duty cycle does not change much. During turn off, the controller will turn on again the MOSFET when the current flowing on the mosfet returns to 0 ampere. In hysteretic mode, the MOSFET Q6 is switch on until a predetermined peak current is reached. The aim of the simulation is to have an insight on how to configure and program the dsPIC33CH for hysteretic current control. The control method is an emulation of components and programming of dsPIC33CH. ![]() The circuit simulated here is the power circuit included in the DM330028 dsPIC33CH Curiosity Developement Board. In this article, LTspice simulation of a 5V to 3.3V buck converter using hysteretic current control is presented. ![]()
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