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MP1601A Datasheet(PDF) 14 Page - Monolithic Power Systems |
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MP1601A Datasheet(HTML) 14 Page - Monolithic Power Systems |
14 / 17 page MP1601A – 1A, SYNCHRONOUS, STEP-DOWN CONVERTER IN A SOT563 MP1601A Rev. 1.0 www.MonolithicPower.com 14 9/2/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. APPLICATION INFORMATION Setting the Output Voltage The external resistor divider sets the output voltage (see the Typical Application on page 14). Select the feedback resistor (R1) to reduce the VOUT leakage current, typically between 100kΩ to 200kΩ. There is no strict requirement on the feedback resistor. R1 > 10kΩ is reasonable for the application. R2 can then be calculated with Equation (2): out R1 R2 V 1 0.6 (2) Figure 2 shows the feedback circuit. R1 R2 VOUT FB MP1601A Figure 2: 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 less than 50 mΩ to optimize efficiency. High-frequency, switch-mode power supplies with a magnetic device have strong electronic magnetic inference for the system. Any unshielded power inductor should be avoided since it has poor magnetic shielding. Metal alloy or multiplayer chip power shield inductors are recommended for the application since they can decrease 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 can be estimated with Equation (3) OUT IN OUT 1 IN L OSC V (V V ) L V I 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. 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. Higher output voltages may require a 22 μF capacitor to increase system stability. The input capacitor requires an adequate ripple current rating since it absorbs the input switching current. Estimate the RMS current in the input capacitor with Equation (5): OUT OUT C1 LOAD IN IN VV I I 1 VV (5) The worst-case scenario occurs at VIN = 2VOUT, shown in Equation (6): LOAD C1 I I 2 (6) |
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