công cụ tìm kiếm bảng dữ liệu linh kiện điện tử
  Vietnamese  ▼
ALLDATASHEET.VN

X  

Preview PDF HTML

LM27341 bảng dữ liệu(PDF) 15 Page - Texas Instruments

tên linh kiện LM27341
Giải thích chi tiết về linh kiện  LM27341/LM27342/LM27341-Q1/LM27342-Q1 2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regulator with Frequency Synchronization
PDF  44 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
nhà sản xuất  TI [Texas Instruments]
Trang chủ  http://www.ti.com
Logo TI - Texas Instruments

LM27341 bảng dữ liệu(HTML) 15 Page - Texas Instruments

Back Button LM27341_15 Datasheet HTML 11Page - Texas Instruments LM27341_15 Datasheet HTML 12Page - Texas Instruments LM27341_15 Datasheet HTML 13Page - Texas Instruments LM27341_15 Datasheet HTML 14Page - Texas Instruments LM27341_15 Datasheet HTML 15Page - Texas Instruments LM27341_15 Datasheet HTML 16Page - Texas Instruments LM27341_15 Datasheet HTML 17Page - Texas Instruments LM27341_15 Datasheet HTML 18Page - Texas Instruments LM27341_15 Datasheet HTML 19Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 15 / 44 page
background image
L =
VOUT + VD1
IOUT x r x fSW
x (1-DMIN)
D =
VOUT + VD1
VIN + VD1 - VDS
D =
VOUT
VIN
LM27341, LM27342, LM27341-Q1, LM27342-Q1
www.ti.com
SNVS497E – NOVEMBER 2008 – REVISED APRIL 2013
Figure 36. Recommended Ripple Ratio Vs. Duty Cycle
The Duty Cycle (D) can be approximated quickly using the ratio of output voltage (VOUT) to input voltage (VIN):
(10)
The application's lowest input voltage should be used to calculate the ripple ratio. The catch diode forward
voltage drop (VD1) and the voltage drop across the internal NFET (VDS) must be included to calculate a more
accurate duty cycle. Calculate D by using the following formula:
(11)
VDS can be approximated by:
VDS = IOUT x RDS(ON)
(12)
The diode forward drop (VD1) can range from 0.3V to 0.5V depending on the quality of the diode. The lower VD1
is, the higher the operating efficiency of the converter.
Now that the ripple current or ripple ratio is determined, the required inductance is calculated by:
where
•
DMIN is the duty cycle calculated with the maximum input voltage
•
fsw is the switching frequency
•
IOUT is the maximum output current of 2A
(13)
Using IOUT = 2A will minimize the inductor's physical size.
INDUCTOR CALCULATION EXAMPLE
Operating conditions for the LM27342 are:
VIN = 7 - 16V
VOUT = 3.3V
IOUT = 2A
fSW = 2 MHz
VD1 = 0.5V
Copyright © 2008–2013, Texas Instruments Incorporated
Submit Documentation Feedback
15
Product Folder Links: LM27341 LM27342 LM27341-Q1 LM27342-Q1



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


bảng dữ liệu tải về

Go To PDF Page


Link URL



Cho đến nay ALLDATASHEET có giúp ích cho doanh nghiệp của bạn hay không?  [ DONATE ] 

Alldatasheet là   |   Quảng cáo   |   Liên lạc với chúng tôi   |   Chính sách bảo mật   |   Liên kết đến bảng dữ liệu    |   Trao đổi link   |   Tìm kiếm theo nhà sản xuất
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