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| SP6126_1 Datasheet, PDF (6/8 Pages) Sipex Corporation – Evaluation Board Manual | |||
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SP6126
Vout
CP1 2pF
CZ2 130pF
RZ2 200k
Vref =0.6V
Error Amplif ier
RZ
VFB
CZ
R1
200k, 1%
R2
Figure 9- RZ and CZ in conjunction with internal
compensation components form a Type-III compensation
Loop Compensation for the SP6126EB
L = 6.8uH, C = 22uF/5mOhm ceramic capacitor
From equation (2) fESRZERO = 1.45MHz. From equation (3) fDBPOLE = 13 kHz. Since the
condition specified in (1) is not met, Type-III compensation has to be used by adding
external components RZ and CZ. Using equation (4) CZ is calculated 61.2pF. After
bench tests a 82uf was selected for optimum performance. Following the guideline
given in table 1, a 2kOhm RZ was used.
6
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