Datenblatt-Suchmaschine für elektronische Bauteile
  German  ▼
ALLDATASHEETDE.COM

X  

74408943470 Datenblatt(PDF) 11 Page - Union Semiconductor, Inc.

Teilenummer 74408943470
Bauteilbeschribung  Hysteretic Buck High Brightness LED Driver with Internal Switch
Download  14 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Hersteller  UNIONSEMI [Union Semiconductor, Inc.]
Direct Link  http://www.union-ic.com
Logo UNIONSEMI - Union Semiconductor, Inc.

74408943470 Datenblatt(HTML) 11 Page - Union Semiconductor, Inc.

Back Button 74408943470 Datasheet HTML 6Page - Union Semiconductor, Inc. 74408943470 Datasheet HTML 7Page - Union Semiconductor, Inc. 74408943470 Datasheet HTML 8Page - Union Semiconductor, Inc. 74408943470 Datasheet HTML 9Page - Union Semiconductor, Inc. 74408943470 Datasheet HTML 10Page - Union Semiconductor, Inc. 74408943470 Datasheet HTML 11Page - Union Semiconductor, Inc. 74408943470 Datasheet HTML 12Page - Union Semiconductor, Inc. 74408943470 Datasheet HTML 13Page - Union Semiconductor, Inc. 74408943470 Datasheet HTML 14Page - Union Semiconductor, Inc.  
Zoom Inzoom in Zoom Outzoom out
 11 / 14 page
background image
________________________________________________________________________
http://www.union-ic.com Rev.04 Apr.2016
11/14
UM1351
Load Current
Inductor
Saturation Current
0.4A<IOUT≤0.7A
47-100μH
1.3-1.5 times of load current
IOUT≤0.4A
68-220μH
Order Code
L(μH)
Size
DCR (mΩ)
Saturation
Current (mA)
Manufacturer
74408943470
47
4838
305
1100
Würth Elektronik
www.we-online.com
The inductor value should be chosen to maintain operating duty cycle and switch 'on'/'off'
times within the specified limits over the supply voltage and load current range. The following
equations can be used as a guide.
LX Switch 'On' time
TON=(L1*ΔI)/(VIN-VLED-ILED*(RS+RL+RLX))
LX Switch 'Off' time
TOFF=(L1*ΔI)/(VLED+VD+ILED*(RS+RL))
Where:
L1 is the coil inductance (H)
RL is the coil resistance (Ω)
RS is the current sense resistance (Ω)
ILED is the required LED current (A)
ΔI is the coil peak-peak ripple current (A) {internally set to 0.3×I
LED}
VIN is the supply voltage (V)
VLED is the total LED forward voltage (V)
RLX is the switch resistance (Ω) {=0.4Ω nominal}
VD is the diode forward voltage at the required load current (V)
Diode Selection
For maximum efficiency and performance, the rectifier (D1) should be a fast low capacitance
Schottky diode with low reverse leakage at the maximum operating voltage and temperature.
They also provide better efficiency than silicon diodes, due to a combination of lower forward
voltage and reduced recovery time.
It is important to select parts with a peak current rating above the peak coil current and a
continuous current rating higher than the maximum output load current. It is very important to
consider the reverse leakage of the diode when operating above 85°C. Excess leakage will
increase the power dissipation in the device and if close to the load may create a thermal
runaway condition.
The higher forward voltage and overshoot due to reverse recovery time in silicon diodes will
increase the peak voltage on the LX output. If a silicon diode is used, care should be taken to
ensure that the total voltage appearing on the LX pin including supply ripple, does not exceed
the specified maximum value.
PCB Layout Guidelines
Careful PCB layout is critical to achieve low switching losses and stable operation. Minimize
ground noise by connecting high current ground returns, the input bypass capacitor ground lead,
and the output filter ground lead to a single point. Place Rsense as close as possible to the ISENSE
and VIN. For better noise immunity, a Kelvin connection is strongly recommended between
ISENSE and Rsense.


Ähnliche Teilenummer - 74408943470

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
Wurth Elektronik GmbH &...
74408943470 WURTH-74408943470 Datasheet
265Kb / 3P
   POWER CHOKE WE-SPC 4838
More results

Ähnliche Beschreibung - 74408943470

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
Union Semiconductor, In...
UM1360 UNIONSEMI-UM1360_16 Datasheet
603Kb / 13P
   Hysteretic Buck High Brightness LED Driver with Internal Switch
UM1361S UNIONSEMI-UM1361S Datasheet
480Kb / 13P
   Hysteretic Buck High Brightness LED Driver with Internal Switch
UM1360 UNIONSEMI-UM1360 Datasheet
855Kb / 14P
   Hysteretic Buck High Brightness LED Driver with Internal Switch
UM1361S UNIONSEMI-UM1361S_16 Datasheet
488Kb / 13P
   Hysteretic Buck High Brightness LED Driver with Internal Switch
UM1351 UNIONSEMI-UM1351 Datasheet
849Kb / 14P
   Hysteretic Buck High Brightness LED Driver with Internal Switch
logo
E-CMOS Corporation
EC4304 E-CMOS-EC4304 Datasheet
600Kb / 13P
   1A, Hysteretic, High Brightness LED Driver with Internal Switch
EC4304C E-CMOS-EC4304C Datasheet
591Kb / 8P
   1.5A, Hysteretic, High Brightness LED Driver with Internal Switch
logo
SHANGHAI BELLING CO., L...
BL9580 BELLING-BL9580 Datasheet
350Kb / 17P
   High Brightness LED Driver with Internal Switch
BL9582 BELLING-BL9582 Datasheet
309Kb / 16P
   High Brightness LED Driver with Internal Switch
BL9581 BELLING-BL9581 Datasheet
325Kb / 16P
   High Brightness LED Driver with Internal Switch
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14


Datenblatt Download

Go To PDF Page


Link URL




Privatsphäre und Datenschutz
ALLDATASHEETDE.COM
War ALLDATASHEET hilfreich?  [ DONATE ] 

Über Alldatasheet   |   Werbung   |   Kontakt   |   Privatsphäre und Datenschutz   |   Linktausch   |   Hersteller
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