전자부품 데이터시트 검색엔진
  Korean  ▼
ALLDATASHEET.CO.KR

X  

Preview PDF HTML

PM6686 데이터시트(PDF) 38 Page - STMicroelectronics

부품명 PM6686
상세설명  Constant ON-time control
PDF  50 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6686 데이터시트(HTML) 38 Page - STMicroelectronics

Back Button PM6686 Datasheet HTML 34Page - STMicroelectronics PM6686 Datasheet HTML 35Page - STMicroelectronics PM6686 Datasheet HTML 36Page - STMicroelectronics PM6686 Datasheet HTML 37Page - STMicroelectronics PM6686 Datasheet HTML 38Page - STMicroelectronics PM6686 Datasheet HTML 39Page - STMicroelectronics PM6686 Datasheet HTML 40Page - STMicroelectronics PM6686 Datasheet HTML 41Page - STMicroelectronics PM6686 Datasheet HTML 42Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 38 / 50 page
background image
Application information
PM6686
38/50
Doc ID 15281 Rev 4
10
Application information
10.1
External components selection
10.1.1
Inductor
Once that switching frequency is defined, inductor selection depends on the desired
inductor ripple current and load transient performance.
Low inductance means great ripple current and could generate great output noise. On the
other hand, low inductor values involve fast load transient response.
A good compromise between the transient response time, the efficiency, the cost and the
size is to choose the inductor value in order to maintain the inductor ripple current
ΔI
L
between 20% and 50% of the maximum output current ILOAD (max). The maximum
ΔI
L
occurs at the maximum input voltage. With these considerations, the inductor value can be
calculated with the following relationship:
Equation 8
Where fSW is the switching frequency, VIN is the input voltage, VOUT is the output voltage
and
ΔI
L is the selected inductor ripple current.
In order to prevent overtemperature working conditions, inductor must be able to provide an
RMS current greater than the maximum RMS inductor current ILRMS:
Equation 9
Where
ΔI
L(max) is the maximum ripple current:
Equation 10
If hard saturation inductors are used, the inductor saturation current should be much greater
than the maximum inductor peak current Ipeak:
Equation 11
Using soft-saturation inductors it’s possible to choose inductors with saturation current limit
nearly to Ipeak.
Below there is a list of some inductor manufacturers.
IN
OUT
L
sw
OUT
IN
V
V
I
f
V
V
L
×
Δ
×
−
=
12
(max))
I
(
(max))
I
(
I
2
L
2
LOAD
LRMS
Δ
+
=
max
IN
OUT
sw
OUT
max
IN
L
V
V
L
f
V
V
(max)
I
×
×
−
=
Δ
2
(max)
I
(max)
I
Ipeak
L
LOAD
Δ
+
=



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 48 49 50


데이터시트 다운로드

Go To PDF Page


링크 URL



ALLDATASHEET 가 귀하에 도움이 되셨나요?  [ DONATE ] 

Alldatasheet는?   |   광고문의   |   운영자에게 연락하기   |   개인정보취급방침   |   링크 투 데이터시트    |   링크교환   |   제조사별 검색
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