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W-6139TD-GT データシート(PDF) 11 Page - Copal Electronics |
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W-6139TD-GT データシート(HTML) 11 Page - Copal Electronics |
11 / 13 page W-6139 11 Board Layout The W-6139 is a high-frequency switching regulator. The traces that carry the high-frequency switching current have to be carefully laid out on the board in order to minimize EMI, ripple and noise in general. The thicker lines on Figure 26 show the switching current path. All these traces have to be short and wide enough to minimize the parasitic inductance and resistance. The loop shown on Figure 26 corresponds to the current path when the W-6139 internal switch is closed. On Figure 27 is shown the current loop, when the W-6139 switch is open. Both loop areas should be as small as possible. Capacitor C1 has to be placed as close as possible to the VIN pin and GND. The capacitor C2 has to be connected separately to the top LED anode. A ground plane under the W-6139 allows for direct connection of the capacitors to ground. The resistor R1 must be connected directly to the GND pin of the W-6139 and not shared with the switching current loops and any other components. Figure 26. Closed n e p O . 7 2 e r u g i F p o o L t n e r r u C h c t i w s switch Current Loop VIN W-6139 V D L OUT R1 FB Switch Closed SW GND VIN W-6139 D L R1 FB Switch Open SW GND SHDN C1 C2 VIN C2 C1 SHDN VIN VOUT Figure 28. Recommended PCB Layout |
同様の部品番号 - W-6139TD-GT |
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同様の説明 - W-6139TD-GT |
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