Motor de Búsqueda de Datasheet de Componentes Electrónicos
Selected language     Spanish  ▼

Delete All
ON OFF
ALLDATASHEET.ES

X  

Preview PDF Download HTML

FC9920 Datasheet(PDF) 7 Page - First Silicon Co., Ltd

No. de Pieza. FC9920
Descripción  3-Pin Switch-Mode LED Lamp Driver
Descarga  7 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Fabricante  FS [First Silicon Co., Ltd]
Página de inicio  http://www.firstsilicon.co.kr/
Logo 

FC9920 Datasheet(HTML) 7 Page - First Silicon Co., Ltd

   
Zoom Inzoom in Zoom Outzoom out
 7 / 7 page
background image
FC9920
2012. 10. 31
7/7
Revision No : 0
FC9920 Layout Considerations
See Figure 7 for a recommended circuit board layout for the FC9920.
Single Point Grounding
Use a single point ground connection from the input filter capacitor to the area of copper connected to the
GND pin.
Bypass Capacitor (CDD)
The VDD pin bypass capacitor CDD should be located as near as possible to the VDD and GND pins.
Switching Loop Areas
The area of the switching loop connecting the input filter capacitor CIN, the diode D1 and the FC9920
together should be kept as small as possible.
The switching loop area connecting the output filter capacitor CO, the inductor L1 and the diode D1
together should be kept as small as possible.
Thermal Considerations vs. Radiated EMI
The cooper area where GND pin is connected acts not only as a single point ground, but also as a heat
sink.
This area should be maximized for good heat sinking, especially when FC9920 (SOT-89 package), is
used.
The same applies to the cathode of the free-wheeling diode D1. Both nodes are quiet and therefore, will
not cause radiated RF emission. The switching node copper area connected to the DRAIN pin of the
FC9920, the anode of D1 and the inductor L1 needs to be minimized. A large switching node area can
increase high frequency radiated EMI.
Input Filter Layout Considerations
The input circuit of the EMI filter must not be placed in the direct proximity to the inductor L1 in order to
avoid magnetic coupling of its leakage fields. This consideration is especially important when unshielded
construction of L1 is used. When an axial input EMI filter inductor LIN is selected, it must be positioned
orthogonal with respect to L1. The loop area formed by CIN2, LIN, and CIN should be minimized. The
input lead wires must be twisted together.
L1
VRD1
F1
Figure7. Recommended circuit board layout with the FC9920 (SOT-89 package)
AC Line
85-135VAC
CIN2
CIN
LIN
D1
D2-5
CO
U1
CDD
LED +
LED -
COMPONENT SIDE VIEW


Html Pages

1  2  3  4  5  6  7 


Datasheet Download




Enlace URL




Privacy Policy
ALLDATASHEET.ES
Does ALLDATASHEET help your business so far?  [ DONATE ]  

Todo acerca de Alldatasheet   |   Publicidad   |   Contáctenos   |   Política de Privacidad   |   Favorito   |   Intercambio de Enlaces   |   Lista de Fabricantes
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