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LM2648 Datasheet(PDF) 22 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LM2648
Description  Two-Phase, Synchronous Step-Down 3-Channel Switching Regulator Controller
PDF  23 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2648 Datasheet(HTML) 22 Page - National Semiconductor (TI)

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Component Selection (Continued)
Zero1:
Zero2: (if R
fb2 >> Rc2)
PROCEDURE
The following procedure will create a 20dB/decade loop gain
roll-off. First set fz2 approximately one half decade above
fdp. Since this zero is set using one of the feedback resis-
tors, the output voltage may have to be re-adjusted using
Rfb1 after the compensation has been set. Also, the DC loop
gain will increase as Rfb2 decreases.
Next, set fz1 approximately one half decade below fdp.
Set fp2 to be equal to fzESR.
Finally, set fp3 to 150kHz (half the switching frequency).
Once the compensation has been set, the bandwidth can be
most easily varied by using Rc2 to shift fp2, or by using Cc2
to shift fp3.
www.national.com
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