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FC9922 Fiches technique(PDF) 8 Page - First Silicon Co., Ltd |
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FC9922 Fiches technique(HTML) 8 Page - First Silicon Co., Ltd |
8 / 8 page FC9922 2012. 10. 31 8/8 Revision No : 0 See Figure 7 for a recommended circuit board layout for the FC9922. 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 FC9922 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 FC9922, (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 FC9922, 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. FC9922 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 FC9922 D2-5 L IN C O L1 U1 VRD1 C IN C N2 D1 C DD F1 AC Line 85-264VAC LED + LED - COMPONENT SIDE VIEW |
Numéro de pièce similaire - FC9922 |
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Description similaire - FC9922 |
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