ADP2443ACPZN-R7 datasheet(19/25 Pages) AD

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ADP2443

Data Sheet

Rev. 0 | Page 18 of 24

The control to output transfer function is based on the following

equations:





































COMP

OUT

)

(

)

(

)

(

where:

AVI = 10 A/V.

R is the load resistance.

OUT

ESR





where:

RESR is the ESR of the output capacitor.

COUT is the output capacitance.

OUT

ESR









)

(

The ADP2443 uses a transconductance amplifier for the error

amplifier and to compensate the system. Figure 38 shows the

simplified, peak current mode control, small signal circuit.

VOUT

RTOP

RBOT

CCP

VCOMP

AVI

COUT

RESR

Figure 38. Simplified Peak Current Mode Control, Small Signal Circuit

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

and the optional CCP and RC contribute an optional pole.

The closed-loop transfer equation is as follows:













TOP

BOT

)

(

()

)

CCCP

CCP















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 using the following equation:

OUT





2 

Place the compensation zero at the domain pole, fP; then

determine CC using the following equation:

OUT

ESR







)

(

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

the ESR of the output capacitor.

OUT

ESR





ADIsimPOWER DESIGN TOOL

The ADP2443 is supported by the ADIsimPower™ design tool

set. ADIsimPower is a collection of tools that produce complete

power designs that are optimized for a specific design goal. The

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

materials and calculate performance in minutes. ADIsimPower

can optimize designs for cost, area, efficiency, and component

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, refer to

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

this website, and users can request an unpopulated board.

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