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CAT32RD4 Datasheet(PDF) 10 Page - Catalyst Semiconductor |
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CAT32RD4 Datasheet(HTML) 10 Page - Catalyst Semiconductor |
10 / 14 page CAT32 10 Doc. No. 5001, Rev. AC PCB LAYOUT GUIDELINES The CAT32 is a high-frequency switching regulator and therefore proper PCB board layout and component placement can minimize noise and radiation and increase efficiency. To maximize efficiency, the CAT32 design has fast switch rise and fall times. To prevent radiation and high frequency resonance problems minimize the length and area of all traces connected to the SW pin and use a ground plane under the switching regulator. The switch, schottky output diode and output capacitor signal path should be kept as short as possible. The ground connection for the R SET resistor should be tied directly to the GND pin and not be shared with other components. TYPICAL APPLICATION CIRCUITS The application diagrams below are shown for the SOT23 packages. Two LEDs with DC Level Dimming Control: Three LEDs with DC Level Dimming Control: 15mA 4 2 3 1 6 5 SW VIN SHDN RSET D1 VIN 2.5V DC DIMMING CONTROL CAT32 LED GND 15mA 4 2 3 1 6 5 SW VIN SHDN RSET D1 VIN 2.5V DC DIMMING CONTROL CAT32 LED GND Efficiency - Three LEDs LED CURRENT [mA] 60 65 70 75 80 85 0 5 10 15 20 Vin = 4.2V Vin = 3.0V |
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