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AP8802 Datasheet(PDF) 10 Page - Diodes Incorporated |
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AP8802 Datasheet(HTML) 10 Page - Diodes Incorporated |
10 / 16 page AP8802 1A LED Step-down Converter AP8802 Rev. 5 10 of 16 DECEMBER 2009 DS31766 www.diodes.com © Diodes Incorporated Capacitor Selection The small size of ceramic capacitors makes them ideal for AP8802 applications. X5R and X7R types are recommended because they retain their capacitance over wider voltage and temperature ranges than other types such as Z5U. A 2.2 μF input capacitor is sufficient for most intended applications of AP8802. A 4.7 μF input capacitor is suggested for application with an input voltage equal or higher than 40V. Diode Selection Schottky diodes, e.g. B2100 or B1100, with their low forward voltage drop and fast reverse recovery, are the ideal choice for AP8802 applications. PWM Dimming A Pulse Width Modulated (PWM) signal with a max resolution of 8bit, can be applied to the CTRL pin to change the output current to a value above or below the nominal average value set by resistor RSET. To achieve this resolution the PWM frequency has to be lower than 500Hz. Thermal Considerations The graph below in figure 8, gives details for power derating. This assumes the device to be mounted on a 25x25mm PCB with 1oz copper standing in still air. Maximum Power Dissipation 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 0 25 50 75 100 125 Ambient Temperature (Deg C) SOP-8L SOP-8L - EP DFN3030-10 Figure 8: AP8802 derating curves Package Selection The device comes with a wide selection of packages. The suggested package is able to provide a case temperature below 70˚C (with an ambient temperature of 25˚C) for the combination of input voltage and load requested. Application Information (Continued) |
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