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PM6641 Datenblatt(PDF) 36 Page - STMicroelectronics

Teilenummer PM6641
Bauteilbeschribung  Monolithic VR for chipset and DDR2/3 supply for ultra-mobile PC (UMPC) applications
PDF  47 Pages
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6641 Datenblatt(HTML) 36 Page - STMicroelectronics

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Once the inductor value is determined, the inductor current ripple is then recalculated:
Equation 13
The next step is the computation of the maximum RMS inductor current:
Equation 14
The inductor must have an RMS current greater than IL,RMS in order to assure thermal
stability.
Then the calculation of the maximum inductor peak current follows:
Equation 15
IL,PEAK is important when choosing the inductor, in term of its saturation current.
The saturation current of the inductor should be greater than the maximum between ILpeak
and the programmed peak current limit, selected by an external resistor connected between
CSNS pin and AGND (as described in Current Limit section).
8.2
Input capacitor selection
In a buck topology converter the current that flows through the input capacitor is pulsed and
with zero average value. The RMS input current, for each switching regulator, can be
calculated as follows:
Equation 16
Neglecting the second term, the equation is reduced to:
Equation 17
MAX
,
IN
OUT
OUT
MAX
,
IN
MAX
,
L
V
V
L
fsw
V
V
I
⋅
⋅
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∆
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I
(
)
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I
2
MAX
,
L
2
MAX
,
LOAD
RMS
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∆
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MAX
,
L
MAX
,
LOAD
PEAK
,
L
∆
+
=
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L
2
LOAD
RMS
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(
D
12
1
)
D
1
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I
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∆
⋅
+
−
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=
)
D
1
(
D
I
I
LOAD
RMS
Cin
−
⋅
≅



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