AP3595

Document number: DS36749 Rev. 1 - 2

14 of 23

www.diodes.com

January 2014

© Diodes Incorporated

AP3595

A Product Line of

Diodes Incorporated

The poles and zero of the transfer functions are:

OUT

LC

C

L

f









)

2

/

1

(

2

1



OUT

ESR

ESR

C

R

f











2

1

capacitors.

L1=L

L2=L

Figure 6. The Output LC Filter

Figure 7. .Frequency Response of the LC Filters

The PWM modulator is shown in Figure 8. The input is the output of the error amplifier and the output is the PHASE node. The transfer function of

the PWM modulator is given by:

OSC

IN

PW M

V

V

Gain





+

-

PWM

Comparator

OSC

ΔV

OSC

Driver

Driver

PHASE

Output of Error

Amplifier

Figure 8.The PWM Modulator