L7987L datasheet(27/41 Pages) STMICROELECTRONICS

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L7987L

Application information

5.4.2

Type III compensation network

If FzESR is higher than the target loop bandwidth, as usually happens if the output filter is

based on MLCC ceramic capacitors, a type III compensation network must be designed.

Figure 13. Type III compensation network

The type III compensation network transfer function, from VOUT to COMP, is computed in

Equation 24.

Equation 24

In addition to what shown in Equation 21, two more singularities are proper of this

compensation network:

Equation 25

















































































)

(

)

(

)

(

COMPIII



fZ2

 C

s 

RU RS





-------------------------------------------------------;

fP2

 C

SRS



----------------------------

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