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IR2110 Floating Supply Voltage

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malithmanuhara

malithmanuhara

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IR2101 Floating Supply Voltage

I have no clear idea regarding,
What is Floating supply?
What is the use of Floating supply voltage in IR2101 and how it affect to the functionality?
Please give me some good explanations. Thank You!
 
Last edited:

Pratically speaking, in your case it means that the voltage difference between pins HO and Vs, here V(HO) > V(Vs) when on, is not affected by the varying voltage at Vs (relative to ground or pin COM)... hence the word "floating" since VS can float ;)

This internal floating supply is important to drive the gate of an upper N-Channel MOSFET (connected to the positive terminal of the main DC supply, Vcc) which needs higher voltage than Vcc. When the N-MOSFET is on, its drain to source resitance becomes close to zero ohm, hence the source voltage becomes close to Vcc and V(gate) should be higher than Vcc.
 
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Thank you very much for the guide! I studied with your guide and it helped me a lot! thanx again! i would like to put some images of my study so that some one else will understand this easily!

(using Proteus)

Circuit diagram

Capture1.JPG

The output graph

Capture.JPG

Oscilloscope

Capture2.JPG
 

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