pwm chip

From: kell (kellrobinson_at_billburg.com)
Date: 03/12/05 

Date: 11 Mar 2005 20:17:49 -0800

I would like to wire up a current mode pwm chip to drive an inductor to
a specific current each cycle. Take the UC3842/3 chip for example:

http://rocky.digikey.com/WebLib/On-Semi/Web%20Data/UC2842B_43B,%20UC3842B_43B,%20NCV3843BV.pdf

This data *** has a formula on page 8 (under "Operating Description")
for peak inductor current in terms of Error Amp Output. I want to
calculate Rs that will give me a certain Ipk. In the formula, what
value do I use for the V(Pin1) term. Do I have to connect pins 1 and 2
with a resistor as in figure 32 on page 14, which would make V(Pin1)
2.5 volts?

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