Cirrus-logic AN374 Manual de usuario descargar pdf (Pagina 15)

AN374

AN374REV2 15

Figure 6 illustrates the current comparison through the inductor. In this case, the buck is chosen to explain

the point. The same logic can be extended to the flyback topology as well.

In a single-string design, power P

OUT(single)

delivered in the first switching period TT equals power deliv-

ered in the second switching period and the total power is equal to two times power P

OUT(single)

. In a two-

channel design, the total power P

OUT(dual)

is approximately equal to:

The above equation yields Equation 12:

where

 = P

MODE2

MODE1

The size of the inductor depends on the amount of energy stored at a first-order approximation. The energy

stored in the inductor of a single string system is equal to P

OUT(single)

 F

. The maximum energy stored

in the inductor of a two string system is equal to P

MODE1

F

sw1

. The size factor  of the inductor is defined

by:

From Equation 13, it can be seen that the inductor for a CS1630/31-based equivalent system will be



times larger.

Power Transferred in a Single String Controller

Power Transferred in a Two String Controller with

Unequal Balance between Two Strings

i(t)

T1 T2

T3T1 T2

CH1

CH 1

CH1

CH2

CH 2

Figure 6. Current Comparison through the Inductor

OUT dual

MODE1

MODE2

+= 2P

OUT glesin



[Eq. 11]

MODE1

OUT glesin

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

1 +

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



[Eq. 12]





1 +F

sw1



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



[Eq. 13]

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 34 35

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Cirrus-logic AN374 Manual de usuario Pagina 15

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