Diodes AP3595 Manuel d'utilisateur télécharger pdf (Page 16)

AP3595

Document number: DS36749 Rev. 1 - 2

16 of 23

www.diodes.com

January 2014

AP3595

A Product Line of

Diodes Incorporated

Application Information (Cont.)

Calculate the C2 by the equation:

75.022







4. Set the pole at the ESR zero frequency f

ESR

ESRP

ff 

Calculate the C1 by the following equation:

1222





ESR

fCR



5. Set the second pole f

at the half of the switching frequency and also set the second zero f

at the output LC filter double pole f

. The

compensation gain should not exceed the error amplifier open loop gain. Check the compensation gain at f

with the capabilities of the error

amplifier.

LCZ

SWP





5.0

Combine the two equations will get the following component calculations:













Figure 10.Converter Gain and Frequency

14. Output Inductor Selection

The duty cycle (D) of a buck converter is the function of the input voltage and output voltage. Once an output voltage is fixed, it can be written as:

INOUT

VVD /

For two-phase converter, the inductor value (L) determines the sum of the two inductor ripple current, ΔI

P-P

, and affects the load transient

response. Higher inductor value reduces the output capacitors’ ripple current and induces lower output ripple voltage. The ripple current can be

approximated by:

OUT

OUTIN

I 









Where f

is the switching frequency of the regulator.

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Diodes AP3595 Manuel d'utilisateur Page 16

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