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34704 Datasheet(PDF) 47 Page - Freescale Semiconductor, Inc

Part # 34704
Description  Multiple Channel DC-DC Power Management IC
PDF  54 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

34704 Datasheet(HTML) 47 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
Freescale Semiconductor
47
34704
FUNCTIONAL DEVICE OPERATION
COMPONENT CALCULATION
The passive components associated to these frequencies are calculated with the following formulas.
C1
Vinmin
VRAMP
------------------
1
D
′
min
2
-----------------
⎝⎠
⎜⎟
⎛⎞
1
2
π F
POR1
()
-------------------------------
⎝⎠
⎛⎞
=
C2
1
2
π F
Z2R1
()
------------------------------
⎝⎠
⎛⎞
=
R2
1
2
π F
Z1C1
()
------------------------------
⎝⎠
⎛⎞
=
R3
1
2
π F
P1C2
()
------------------------------
⎝⎠
⎛⎞
=
C3
1
2
π F
P2R2
()
------------------------------
⎝⎠
⎛⎞
=
On the 34704 VRAMP is half of 1.2 V since each operation mode spends only half the ramp.



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