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Hi Barry,
Thank you for your reply. I'm new to this kind of design and control so please bear with my questions, should they sound too simplistic and obvious. Appreciate all the help I'm getting here.
My question is basically related to factors like the necessity of a separate dimming switch...
Hello all,
I am trying to build a circuit to perform PWM dimming of LEDs in a buck converter. To be honest, I have only been able to find resources such as datasheets for readily available ICs to perform this operation. But I would like to carry out the dimming using a microcontroller and...
Hello,
I have a general query. In a step-down converter, will the nature of load affect the inductor current profile? That is, the inductor current is in CCM for a linear load (Resistive load) but goes into DCM when tested for a non-linear load. In this case, will I need to re-size the inductor...
Just to post a quick update:
While doing the individual pin testing of the MOSFET, I noticed that there was heavy ringing only on the drain voltage and the source voltage. I placed a capacitor across the supply (Vin+ and Vin-) to the MOSFET and the ringing subsided by a significant margin. I...
Hi Goldsmith,
Thank you so much for the tip! I will remember this for future testing. I will also try rearranging the components to see if it makes a difference.
Thanks a lot for your time!
Ah, okay I get it. Since a PCB might not be an easy or ready solution for test prototyping, what would you advice as a starting medium for high frequency circuits, if a breadboard cannot be used?
Hi FvM!
thanks for your prompt response. since I'm new to prototyping, could you please explain why a breadboard would be a deciding factor (as in this case) for such a response?
Do you mean to say that the heavy ringing can be eliminated if I patched up this circuit on say a stripboard or a...
Hi,
I'm uploading the image of the converter as well as the oscilloscope output. (Oscilloscope Trace 1: Logic input to the gate driver, Trace 2: Gate driver output, Trace 3: Drain-source voltage of MOSFET)
I'm using a 10 V to 1 V step down converter, with IR2117 as the high side driver for...
Hi Goldsmith and FvM,
Thank you very much for your timely replies. I'm new to hardware and prototyping. A lot of what little I have learnt so far has come from reading the discussions on edaboard. I appreciate your time in helping me.
Goldsmith, could you please explain the need for a larger...
Hi,
I'm using the IR2117 driver for the high side MOSFET IRFP450. My switching frequency is 100 kHz and the application is in a buck converter circuit with an input supply of 10 V stepped down to 1 V. I followed the circuit given in the datasheet to test my gate driver. I'm sorry I'm unable to...
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