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MP1601 Folha de dados(PDF) 17 Page - Monolithic Power Systems |
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MP1601 Folha de dados(HTML) 17 Page - Monolithic Power Systems |
17 / 20 page MP1601 – 1A, SYNCHRONOUS, STEP-DOWN CONVERTER WITH 11µA IQ MP1601 Rev. 1.0 www.MonolithicPower.com 17 3/24/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. APPLICATION INFORMATION Setting the Output Voltage (Only for MP1601GTF) The external resistor divider sets the output voltage (see the Typical Application Circuit on Figure 12 ). Select the feedback resistor (R1), typically between 40kΩ to 200kΩ, to reduce the VOUT leakage current. There is no strict requirement on the feedback resistor. R1 > 10kΩ is reasonable for most applications. Calculate R2 with Equation (2): out R1 R2 V 1 0.6 (2) Figure 10 shows the feedback circuit. Figure 10: Feedback Network Table 1 lists the recommended resistor values for common output voltages. Table 1: Resistor Values for Common Output Voltages VOUT (V) R1 (kΩ) R2 (kΩ) 1.0 200 (1%) 300 (1%) 1.2 200 (1%) 200 (1%) 1.8 200 (1%) 100 (1%) 2.5 200 (1%) 63.2 (1%) 3.3 200 (1%) 44.2 (1%) Selecting the Inductor Most applications work best with a 0.47µH-to- 2.2µH inductor. Select an inductor with a DC resistance below 50mΩ to optimize efficiency. A high-frequency switch mode power supply with a magnetic device has a strong, electronic, magnetic inference for the system. Any un- shielded power inductor should be avoided. Metal alloy or multiplayer chip power inductors are ideal shielded inductors for the application of the EMI as they can decrease the influence effectively. Table 2 lists some recommended inductors. Table 2: Suggested Inductor List Manufacturer P/N Inductance (μH ) Manufacturer PIFE25201B-1R0MS 1.0 CYNTEC CO. LTD 1239AS-H-1R0M 1.0 Tokyo 74438322010 1.0 Wurth For most designs, the inductance value can be calculated with Equation (3): OUT IN OUT 1 IN L OSC V(V V ) L VI f (3) Where ∆IL is the inductor ripple current. Choose the inductor current to be approximately 30% of the maximum load current. The maximum inductor peak current can be calculated with Equation (4): L L(MAX ) LOAD I II 2 (4) Selecting the Input Capacitor The input current to the step-down converter is discontinuous and therefore requires a capacitor to supply AC current to the step-down converter while maintaining the DC input voltage. For best performance, use low ESR capacitors. 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. Higher output voltages may require a 22μF capacitor to increase system stability. The input capacitor requires an adequate ripple current rating because it absorbs the input switching current. Estimate the RMS current in the input capacitor with Equation (5): OUT OUT C1 LOAD IN IN VV II 1 VV (5) The worst case occurs at VIN = 2VOUT, shown in Equation (6): LOAD C1 I I 2 (6) For simplification, choose an input capacitor with an RMS current rating greater than half of the maximum load current. |
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