전자부품 데이터시트 검색엔진
  Korean  ▼
ALLDATASHEET.CO.KR

X  

Preview PDF HTML

SC2441AEVB 데이터시트(PDF) 33 Page - Semtech Corporation

부품명 SC2441AEVB
상세설명  1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter
PDF  37 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
제조업체  SEMTECH [Semtech Corporation]
홈페이지  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC2441AEVB 데이터시트(HTML) 33 Page - Semtech Corporation

Back Button SC2441AEVB Datasheet HTML 29Page - Semtech Corporation SC2441AEVB Datasheet HTML 30Page - Semtech Corporation SC2441AEVB Datasheet HTML 31Page - Semtech Corporation SC2441AEVB Datasheet HTML 32Page - Semtech Corporation SC2441AEVB Datasheet HTML 33Page - Semtech Corporation SC2441AEVB Datasheet HTML 34Page - Semtech Corporation SC2441AEVB Datasheet HTML 35Page - Semtech Corporation SC2441AEVB Datasheet HTML 36Page - Semtech Corporation SC2441AEVB Datasheet HTML 37Page - Semtech Corporation  
Zoom Inzoom in Zoom Outzoom out
 33 / 37 page
background image
33
 2006 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
SC2441A
Applications Information
The inner current-loop is unstable (sub-harmonic
oscillation) unless the inductor current up-slope is steeper
than the inductor current down-slope. For stable
operation above 50% duty-cycle, a compensation ramp
is added to the sensed-current. In the SC2441A the
compensation ramp is made duty-ratio dependent. The
compensation ramp is approximately
D
0.734
SLOPE
e
D
230mV
(D)
V
×
×
×
=
D is the duty ratio.
The slope compensation voltage vs duty ratio is as shown
in Figure 22.
Figure 22. Slope Compensation Voltage Waveform
Illustrated as the picture above, as the duty ratio
increases, the slope compensation voltage added into
the control loop increases too. And the control loop
including the slope compensation is shown in Figure 23.
The voltage transconductance error amplifier (shown in
Figure 24) has a g
m of 315µA/V. C
2
, C
3
and R
2
construct
the compensation network for stable operation with
optimized load transient response.
The feedback gain h and the resistor values are
determined using the equations given in the “Setting the
Output Voltage” section with
.
V
5
.
0
h
o
=
Slope Compensation
Voltage
CS+
CS-
+
-
++
x 29
-
+
0.5V
FB
V
BE+1.13V
+ -
Compensation
Network
Comp
+
-
PWM
EA
Figure 23. Control Flow Chart with Slope
Compensation
k
Figure 24. A simple model of current-mode buck
converter
For the rated output current I
o, the first-order gain k is
determined as
.
V
I
k
c
o
D
D
=
k is the product of equivalent current sensing Rs and
current amplifier gain Gca=29. Furthermore the transfer
0.0
0.1
0.2
0.3
0.4
0.5
0.00.2
0.40.6
0.81.0
Duty Ratio (D)



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


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