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FC9921 Datasheet(PDF) 8 Page - First Silicon Co., Ltd

No. de Pieza. FC9921
Descripción  3-Pin Switch-Mode LED Lamp Driver IC
Descarga  8 Pages
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Fabricante  FS [First Silicon Co., Ltd]
Página de inicio  http://www.firstsilicon.co.kr/
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FC9921 Datasheet(HTML) 8 Page - First Silicon Co., Ltd

   
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FC9921
2012. 10. 31
8/8
Revision No : 0
See
Figure 7 for a recommended circuit board layout for the
FC9921.
Single Point Grounding
capacitor to the area of copper connected to the GND pin.
Bypass Capacitor (C
DD)
The VDD pin bypass capacitor C
DD should be located as
near as possible to the VDD and GND pins.
Switching Loop Areas
capacitor C
IN, the diode D1 and the FC9921 together should
be kept as small as possible.
C
O, the inductor L1 and the diode D1 together should be kept
as small as possible.
Thermal Considerations vs. Radiated EMI
The copper 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
FC9921, (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 FC9921, 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 inp
direct proximity to the inductor L1 in order to avoid magnetic
important when unshielded construction of L1 is used. When
IN is selected, it must be
positioned orthogonal with respect to L1. The loop area
formed by C
N2, L N and CIN should be minimized. The input
lead wires must be twisted together.
FC9921 Layout Considerations
Pin # Function Description
1
DRAIN
Drain terminal of the output switching MOSFET and a linear regulator input.
2
GND
Common connection for all circuits.
3
VDD
Power supply pin for internal control circuits. Bypass this pin with a 0.1uF low impedance capacitor.
Pin Description
Figure 7. Recommended circuit board layout with the FC9921
D2-5
L
IN
C
O
L1
U1
VRD1
C
IN
C
N2
D1
C
DD
F1
AC Line
85-264VAC
LED +
LED -
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