|
34704_11 Datasheet, PDF (42/54 Pages) Freescale Semiconductor, Inc – Multiple Channel DC-DC Power Management IC | |||
|
◁ |
FUNCTIONAL DEVICE OPERATION
COMPONENT CALCULATION
FPO = FBW
FZ1 = 0.9FLC
F22 = 1.1FLC
FP1 = FESR
F2P
=
F----S----W---
2
The passive components associated to these frequencies are calculated with the following formulas.
C1
=
-V----i--n----m----i-n--
VRAMP
â
â
â
D-----â²--m-1---i--n--2-â ââ
â
â
2----Ï----(--F----P-1---O----R----1----)â â
C2
=
â
â
-2---Ï----(--F----1Z---2---R-----1----)â â
R2
=
â
â
2----Ï----(--F----1Z---1---C-----1----)â â
R3
=
â
â
2----Ï----(--F----1P----1---C----2----)â â
C3
=
â
â
2----Ï----(--F----1P----2---R----2----)â â
On the 34704 VRAMP is half of 1.2 V since each operation mode spends only half the ramp.
34704
42
Analog Integrated Circuit Device Data
Freescale Semiconductor
|
▷ |