FUNCTIONAL DEVICE OPERATION
COMPONENT CALCULATION
FPO = FBW
FZ1 = 0.9FLC
F22 = 1.1FLC
FSW
-----------
F2P =
FP1 = FESR
2
The passive components associated to these frequencies are calculated with the following formulas.
Vinmin
⎛
⎞
1
1
⎛
⎞
⎠
------------------ ---------------- ------------------------------
C1 =
C2 =
R2 =
R3 =
C3 =
⎜
⎝
⎟
2 ⎝
⎠
VRAMP
2π(FPOR1)
D′min
1
⎛
⎝
⎞
⎠
-----------------------------
2π(FZ2R1)
1
⎛
⎝
⎞
⎠
-----------------------------
2π(FZ1C1)
1
⎛
⎝
⎞
⎠
-----------------------------
2π(FP1C2)
1
⎛
⎝
⎞
⎠
-----------------------------
2π(FP2R2)
On the 34704 VRAMP is half of 1.2 V since each operation mode spends only half the ramp.
34704
Analog Integrated Circuit Device Data
Freescale Semiconductor
42
FREESCALE [ Freescale ]
