전자부품 데이터시트 검색엔진
  Korean  ▼
ALLDATASHEET.CO.KR

X  

Preview PDF HTML

PM6670AS 데이터시트(PDF) 40 Page - STMicroelectronics

부품명 PM6670AS
상세설명  Complete DDR2/3 memory power supplies controller
PDF  54 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6670AS 데이터시트(HTML) 40 Page - STMicroelectronics

Back Button PM6670AS Datasheet HTML 36Page - STMicroelectronics PM6670AS Datasheet HTML 37Page - STMicroelectronics PM6670AS Datasheet HTML 38Page - STMicroelectronics PM6670AS Datasheet HTML 39Page - STMicroelectronics PM6670AS Datasheet HTML 40Page - STMicroelectronics PM6670AS Datasheet HTML 41Page - STMicroelectronics PM6670AS Datasheet HTML 42Page - STMicroelectronics PM6670AS Datasheet HTML 43Page - STMicroelectronics PM6670AS Datasheet HTML 44Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 40 / 54 page
background image
Application information
PM6670AS
40/54
where
Equation 27a
Equation 27b
Referring to the typical application schematic (figure in cover page and Figure 27), the final
expression is then:
Equation 28
The switching frequency directly affects two parameters:
●
Inductor size: greater frequencies mean smaller inductances. In most of the
applications, real estate solutions (i.e. low-profile power inductors) are mandatory also
with high saturation and r.m.s. currents.
●
Efficiency: switching losses are proportional to the frequency. Generally, higher
frequencies imply lower efficiency.
Even if the switching frequency is theoretically independent from input and output voltages,
parasitic parameters involved in power path (like MOSFETs' on-resistance and inductor's
DCR) introduce voltage drops responsible for a slight dependence on load current.
In addition, the internal delay is due to a light dependence on input voltage.
Table 5. Typical values for switching frequency selection
R1 (k
Ω)R2 (kΩ)
Approx switching frequency (kHz)
330
11
250
330
13
300
330
15
350
330
18
400
330
20
450
330
22
500
IN
OSC
OSC
V
V
=
α
OUT
SNS
OUT
V
V
=
α
OSC
2
1
2
OSC
OSC
SW
K
1
R
R
R
K
f
⋅
+
=
α
=



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 51 52 53 54


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