MIC2104 datasheet(32/42 Pages) MICROCHIP

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MIC2103/4

DS20005899A-page 32

 2017 Microchip Technology Inc.

EQUATION 5-28:

If the voltage divider resistors R1 and R2 are in the kΩ

range, then a Cff of 1 nF to 100 nF can easily satisfy the

large time constant requirements. Also, a 100 nF

injection capacitor Cinj is used in order to be considered

as short for a wide range of the frequencies.

The process of sizing the ripple injection resistor and

capacitors is:

Select Cff to feed all output ripples into the feed-

back pin and make sure the large time constant

assumption is satisfied. Typical choice of Cff is

1 nF to 100 nF if R1 and R2 are in kΩ range.

Select Rinj according to the expected feedback

voltage ripple using Equation 5-29:

EQUATION 5-29:

Then the value of Rinj is obtained as:

EQUATION 5-30:

Select Cinj as 100 nF, which could be consid-

ered as short for a wide range of the frequen-

cies.





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



--- 1

DIV

FB PP





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





1 D

–





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



inj

R1//R2



DIV

------------ 1

–







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