Rev 5/01/06

SP6136 Evaluation Manual

Copyright © 2006 Sipex Corporation

Page 7 of 9

Step by step design procedures:

a.

R2 = 21.8kΩ

b.

CZ3 = 272pF

c.

Let fc =80kHz then:

d.

RZ2 = 34.4kΩ

e.

CZ2 = 538pF

f.

CP1 = 7.7pF

g.

RZ3 = 0.97kΩ

h.

CF1 = 22pF to stabilize SP6136ER1 internal Error Amplify

The above component values were used as a starting point for compensating the converter

and after laboratory testing the values shown in circuit schematic of page 1 were used for

optimum operation.

Figure 12- Gain/Phase measurement of SP6136EB shown on page 1, cross-over

frequency (fc) is 85KHz with a corresponding phase of 65 degrees