the pulse width is pretty much used to regulate the output.
if you vary the output current without varying the pulse width, you will get
voltage drop  ?
----- Original Message -----
From: "Tal" <tal@ZAPTA.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Monday, September 01, 2003 2:19 AM
Subject: [EE]: How does a PWM DC/DC regulates its output ?


> Hello,
>
> I designing a DC/DC with LM3477. The data sheet specifies that the duty
> cycle of the PWM output is about D=Vout/Vin which is independent on the
> output current (see page 13,
> http://www.microchip.com/1010/suppdoc/appnote/all/picref2/index.htm).
>
> If the duty cycle is fixed and independent of the output current, then
> how is the regulation done when for example the  load increse its
> current consumption ?
>
> Thanks,
>
> Tal
>
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