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SP6126EB

SP6126, 2A Evaluation Board Manual

Signal Processing Technologies 

LOOP COMPENSATION

The SP6126 includes Type-II internal compensation components for loop

compensation. External compensation components are not required for systems with

tantalum or aluminum electrolytic output capacitors with sufficiently high ESR. Use the

condition below as a guideline to determine whether or not the internal compensation is

sufficient for your design.

Type-II internal compensation is sufficient if the following condition is met:

f < f ESRZERO

DBPOLE

………………. (1)

where:

1

f ESRZERO = 2.π .RESR .COUT ……….. (2)

1

f DBPOLE = 2.π . L ⋅ COUT ………… (3)

Creating a Type-III compensation Network

The above condition requires the ESR zero to be at a lower frequency than the double-

pole from the LC filter. If this condition is not met, Type-III compensation should be

used and can be accomplished by placing a series RC combination in parallel with R1

as shown below. The value of CZ can be calculated as follows and RZ selected from

table 1.

CZ = L ⋅ C ………….. (4)

R1

fESRZERO/fDBPOLE RZ

1X

50K

2X

40K

3X

30K

5X

10K

>= 10X

2K

Table1- Selection of RZ

5

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