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MP2160 Scheda tecnica(PDF) 10 Page - Monolithic Power Systems |
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MP2160 Scheda tecnica(HTML) 10 Page - Monolithic Power Systems |
10 / 13 page MP2160 – 1.2A PEAK, 6V, 3.5MHz SYNCHRONOUS STEP-DOWN SWITCHER MP2160 Rev. 1.03 www.MonolihicPower.com 10 7/5/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. APPLICATION INFORMATION COMPONENT SELECTION Setting the Output Voltage The external resistor divider is used to set the output voltage (see Typical Application on page 1). The feedback resistor R1 can not be too large neither too small considering the trade-off for stability and dynamic. Choose R1 to be around 40kΩ to 80kΩ. R2 is then given by: out R1 R2 V 1 0.6 The feedback circuit is shown as Figure 2. R1 R2 Vout FB MP2160 Figure 2: Feedback Network Table 1 lists the recommended resistors value for common output voltages. Table 1—Resistor Selection for Common Output Voltages VOUT (V) R1 (kΩ) R2 (kΩ) 1.0 40(1%) 60(1%) 1.2 40(1%) 40(1%) 1.8 60(1%) 30(1%) 2.5 80(1%) 25(1%) 3.3 80(1%) 17.7(1%) Selecting the Inductor A 0.15µH to 1µH inductor 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. OUT IN OUT 1 IN L OSC V(V V ) L VI f Where ΔIL is the inductor ripple current. Choose inductor current to be approximately 30% of the maximum load current. The maximum inductor peak current is: 2 I I I L LOAD ) MAX ( L Selecting the Input Capacitor The input current to the step-down converter is discontinuous, therefore a capacitor is required to supply the AC current to the step-down converter while maintaining the DC input voltage. Use low ESR capacitors for the best performance. Ceramic capacitors with X5R or X7R dielectrics are highly recommended because of their low ESR and small temperature coefficients. For most applications, a 10µF capacitor is sufficient. For higher output voltage, 22μF may be needed for more stable system. Since the input capacitor absorbs the input switching current it requires an adequate ripple current rating. The RMS current in the input capacitor can be estimated by: IN OUT IN OUT LOAD 1 C V V 1 V V I I The worse case condition occurs at VIN = 2VOUT, where: 2 I I LOAD 1 C For simplification, choose the input capacitor whose RMS current rating greater than half of the maximum load current. The input capacitor can be electrolytic, tantalum or ceramic. When using electrolytic or tantalum capacitors, a small and high quality ceramic capacitor, i.e. 0.1μF, should be placed as close to the IC as possible. When using ceramic capacitors, make sure that they have enough capacitance to provide sufficient charge to prevent excessive voltage ripple at input. The input voltage ripple caused by capacitance can be estimated by: LOAD OUT OUT IN IN SIN IV V V1 fC1 V V |
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