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MP2482DS Datasheet(PDF) 10 Page - Monolithic Power Systems |
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MP2482DS Datasheet(HTML) 10 Page - Monolithic Power Systems |
10 / 14 page ![]() MP2482 – 5A, 30V, 420kHZ STEP-DOWN CONVERTER MP2482 Rev.1.4 www.MonolithicPower.com 10 9/21/2011 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2011 MPS. All Rights Reserved. APPLICATION INFORMATION The schematic on the front page shows a typical MP2482 application. The IC can provide up to 5A output current at a nominal output voltage of 3.3V. For proper thermal performance, the exposed pad of the device must be soldered down to the printed circuit board. Setting the Output Voltage The external resistor divider is used to set the output voltage (see the schematic on front page). The feedback resistor R1 also sets the feedback loop bandwidth with the internal compensation capacitor (see Figure 1). Choose R1 to be around 40.2kΩ for optimal transient response. R2 is then given by: 1 V 8 . 0 V 1 R 2 R OUT − = Table 1—Resistor Selection for Common Output Voltages VOUT (V) R1 (kΩ) R2 (kΩ) 1.8 40.2 (1%) 32.4 (1%) 2.5 40.2 (1%) 19.1 (1%) 3.3 40.2 (1%) 13 (1%) 5 40.2 (1%) 7.68 (1%) Selecting the Inductor A 1µH to 10µH inductor with a DC current rating of at least 25% percent higher than the maximum load current is recommended for most applications. For highest efficiency, the inductor DC resistance should be less than 15mΩ. For most designs, the inductance value can be derived from the following equation. OSC L IN OUT IN OUT f I V ) V V ( V L × Δ × − × = Where ΔIL is the inductor ripple current. Choose inductor current to be approximately 30% of the maximum load current, 5A. The maximum inductor peak current is: 2 I I I L LOAD ) MAX ( L Δ + = Under light load conditions below 100mA, larger inductance is recommended for improved efficiency. Output Rectifier Diode The output rectifier diode supplies the current to the inductor when the high-side switch is off. To reduce losses due to the diode forward voltage and recovery times, use a Schottky diode. Choose a diode whose maximum reverse voltage rating is greater than the maximum input voltage, and whose current rating is greater than the maximum load current. Table 2 lists example Schottky diodes and manufacturers. Table 2—Diode Selection Guide Diode Voltage/Current Rating Manufacture B530C 30V, 5A Diodes Inc. MBRD630CT 30V, 6A On Semi Selecting the Input Capacitor The input capacitor (C1) reduces the surge current drawn from the input and the switching noise from the device. The input capacitor impedance at the switching frequency should be less than the input source impedance to prevent high frequency switching current from passing to the input. Ceramic capacitors with X5R or X7R dielectrics are highly recommended because of their low ESR and small temperature coefficients. For 5A output applications, a 22µF capacitor is sufficient. Selecting the Output Capacitor The output capacitor (C2) keeps output voltage small and ensures regulation loop stability. The output capacitor impedance should be low at the switching frequency. Ceramic capacitors with X5R or X7R dielectrics are recommended. |
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