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CAT4237TD-T3 Datasheet(PDF) 11 Page - Catalyst Semiconductor |
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CAT4237TD-T3 Datasheet(HTML) 11 Page - Catalyst Semiconductor |
11 / 14 page CAT4237 © Catalyst Semiconductor, Inc. 11 Doc. No. MD-5013, Rev. B Characteristics subject to change without notice BOARD LAYOUT The CAT4237 is a high-frequency switching regulator. The traces that carry the high-frequency switching current have to be carefully layout on the board in order to minimize EMI, ripple and noise in general. The thicker lines on Figure 3 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 3 corresponds to the current path when the CAT4237 internal switch is closed. On Figure 4 is shown the current loop, when the CAT4237 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 CAT4237 allows for direct connection of the capacitors to ground. The resistor R1 must be connected directly to the GND pin of the CAT4237 and not shared with the switching current loops and any other components. closed open Figure 3. Closed-switch Current Loop Figure 4. Open-switch Current Loop |
Similar Part No. - CAT4237TD-T3 |
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Similar Description - CAT4237TD-T3 |
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