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APW7207CTI-TRG Datasheet(PDF) 11 Page - Anpec Electronics Coropration |
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APW7207CTI-TRG Datasheet(HTML) 11 Page - Anpec Electronics Coropration |
11 / 18 page Copyright © ANPEC Electronics Corp. Rev. A.7 - Nov., 2012 APW7207/A www.anpec.com.tw 11 Layout Consideration For all switching power supplies, the layout is an impor- tant step in the design; especially at high peak currents and switching frequencies. If the layout is not carefully done, the regulator might show noise problems and duty cycle jitter. 1. The input capacitor should be placed close to the VIN and GND. Connecting the capacitor with VIN and GND pins by short and wide tracks without using any vias for filtering and minimizing the input voltage ripple. 2. The inductor should be placed as close as possible to the LX pin to minimize length of the copper tracks as well as the noise coupling into other circuits. 3. Since the feedback pin and network is a high imped- ance circuit, the feedback network should be routed away from the inductor. The feedback pin and feed- back network should be shielded with a ground plane or track to minimize noise coupling into this circuit. 4. A star ground connection or ground plane minimizes ground shifts and noise is recommended. Application Information (Cont.) To Anode of WLEDs From Cathod of WLEDs Via To OVP L1 C1 Via To VOVP D1 VEN VIN LX Refer to Fig. 1 Fig 4. APW7207/A Layout Suggestion R1 VOVP 1 6 5 4 3 2 8 7 LX GND NC FB VIN R1 D1 L1 VOVP To Anode of WLEDs From Cathod of WLEDs Via To VOVP VEN C1 |
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