Electronic Components Datasheet Search
  Indian  ▼
ALLDATASHEET.IN

X  

Preview PDF HTML

PM6641TR Datasheet(PDF) 36 Page - STMicroelectronics

Part # PM6641TR
Description  Monolithic VR for chipset and DDR2/3 supply for ultra-mobile PC (UMPC) applications
PDF  47 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6641TR Datasheet(HTML) 36 Page - STMicroelectronics

Back Button PM6641TR Datasheet HTML 32Page - STMicroelectronics PM6641TR Datasheet HTML 33Page - STMicroelectronics PM6641TR Datasheet HTML 34Page - STMicroelectronics PM6641TR Datasheet HTML 35Page - STMicroelectronics PM6641TR Datasheet HTML 36Page - STMicroelectronics PM6641TR Datasheet HTML 37Page - STMicroelectronics PM6641TR Datasheet HTML 38Page - STMicroelectronics PM6641TR Datasheet HTML 39Page - STMicroelectronics PM6641TR Datasheet HTML 40Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 36 / 47 page
background image
Components selection
PM6641
36/47
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
⋅
⋅
−
=
∆
12
)
I
(
)
I
(
I
2
MAX
,
L
2
MAX
,
LOAD
RMS
,
L
∆
+
=
2
I
I
I
MAX
,
L
MAX
,
LOAD
PEAK
,
L
∆
+
=
2
L
2
LOAD
RMS
Cin
)
I
(
D
12
1
)
D
1
(
D
I
I
∆
⋅
+
−
⋅
⋅
=
)
D
1
(
D
I
I
LOAD
RMS
Cin
−
⋅
≅



Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47


Datasheet Download

Go To PDF Page


Link URL



Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link to Datasheet    |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com