Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

Preview PDF HTML

UM0670 Datasheet(PDF) 33 Page - STMicroelectronics

Part # UM0670
Description  80 W offline LED driver with PFC
PDF  43 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM0670 Datasheet(HTML) 33 Page - STMicroelectronics

Back Button UM0670 Datasheet HTML 29Page - STMicroelectronics UM0670 Datasheet HTML 30Page - STMicroelectronics UM0670 Datasheet HTML 31Page - STMicroelectronics UM0670 Datasheet HTML 32Page - STMicroelectronics UM0670 Datasheet HTML 33Page - STMicroelectronics UM0670 Datasheet HTML 34Page - STMicroelectronics UM0670 Datasheet HTML 35Page - STMicroelectronics UM0670 Datasheet HTML 36Page - STMicroelectronics UM0670 Datasheet HTML 37Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 33 / 43 page
background image
Design features
UM0670
33/43
Doc ID 15327 Rev 2
Figure 40.
Proper startup using diode D104 and capacitor C110
Figure 41.
Improper startup without using diode D104 and capacitor C110
10.2
Zero dimming design implementation
During zero dimming (duty cycle is 0%) the high PF boost converter is in burst mode
because there is zero load. During this mode, capacitors C107 and C110 are charged only
in short pulses (C107 is also slightly charged via resistor from the input voltage, but it is not
enough) and therefore do not have enough energy to also supply the PWM generator and
the second L6562A controller used for the modified buck converter. The circuit shown in
Figure 42 allows brightness changes down to 0% without any problem, because if the



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


Datasheet Download

Go To PDF Page


Link URL



Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link to Datasheet    |   Link Exchange   |   Manufacturer List
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