MCP19035-AAAAESLASHMF datasheet(25/44 Pages) MICROCHIP

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 2012-2013 Microchip Technology Inc.

DS22326B-page 25

MCP19035

The first zero of the compensation network must

be placed at the fLC frequency. The capacitor C1

is calculated using Equation 5-27:

EQUATION 5-27:

CAPACITOR C1

The value of the resistor R4 is estimated using

Equation 5-28:

EQUATION 5-28:

RESISTOR R4

The second zero of the compensation network

must be placed at half of the fLC frequency. The

value of the capacitor C2 is calculated in

Equation 5-29:

EQUATION 5-29:

CAPACITOR C2

The first pole of the compensation network must

be placed at fSW. The value of C3 is calculated in

Equation 5-30:

EQUATION 5-30:

CAPACITOR C3

The second pole of the compensation network

must be placed at half of the fSW .The value for

resistor R3 is calculated in Equation 5-31:

EQUATION 5-31:

RESISTOR R3

The compensation circuit can be simulated with any

available simulator. The values of the components can

be adjusted to meet the initial design parameters

(crossover frequency and phase margin). It is also nec-

essary to ensure that the gain of the compensation cir-

cuit does not exceed the gain of the error amplifier. Due

to the interactions between poles and zeros, it is highly

recommended to use the design tool provided by

Microchip Technology Inc. to design and analyze the

compensation network.

OUT



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

--------



Where:

fCO = cross-over frequency for the compensated

system (usually 1/10th of fSW)

OUT



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



 R



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

 C



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

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