ADP2387ACPZN-R7 datasheet(18/25 Pages) AD

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ADP2387

Data Sheet

Rev. C | Page 18 of 25

RESR

–

CCP

COUT

RTOP

RBOT

–

AVI

VOUT

VCOMP

VOUT

Figure 33. Simplified, Peak Current Mode Control, Small Signal Circuit

The compensation components, RC and CC, contribute a zero, and

the optional components, CCP and RC, contribute an optional pole.

The closed-loop transfer equation is as follows:

TV (s) =

−

TOP

BOT

)

(













The following design guideline shows how to select the RC, CC,

and CCP compensation components for ceramic output capacitor

applications.

Determine the cross frequency (fC). Generally, fC is between

fSW/12 and fSW/6.

Calculate RC by using the following equation:

RC =

OUT

Place the compensation zero at the domain pole (fP), then

determine CC by using the following equation:

CC =

OUT

ESR

)

(

CCP is optional. It can be used to cancel the zero caused by the

ESR of the output capacitor.

CCP =

OUT

ESR

ADIsimPower DESIGN TOOL

The ADP2387 is supported by the ADIsimPower™ design tool

set. ADIsimPower is a collection of tools that produce complete

power designs optimized for a specific design goal. The tools

enable the user to generate a full schematic and bill of materials

and to calculate performance in minutes. ADIsimPower can

optimize designs for cost, area, efficiency, and parts count,

while taking into consideration the operating conditions and

limitations of the IC and all real external components. For

more information about the ADIsimPower design tools, go to

www.analog.com/ADIsimPower. The tool set is available from

the Analog Devices, Inc., website, and users can request an

unpopulated board.

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