Datenblatt-Suchmaschine für elektronische Bauteile |
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MP1494S Datenblatt(PDF) 12 Page - Monolithic Power Systems |
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MP1494S Datenblatt(HTML) 12 Page - Monolithic Power Systems |
12 / 17 page MP1494S – SYNCHRONOUS STEP-DOWN CONVERTER MP1494S Rev. 1.0 www.MonolithicPower.com 12 12/13/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. APPLICATION INFORMATION Setting the Output Voltage The external resistor divider sets the output voltage. The feedback resistor R1 also sets the feedback loop bandwidth with the internal compensation capacitor (see Typical Application on page 1). Choose R1 around 40k Ω, then R2 is: OUT R1 R2 V 1 0.807V Use the T-type network when VOUT is low, as shown in Figure 4. Figure 4: T-Type Network Table 1 lists the recommended T-type resistor value for common output voltages. Table 1: Resistor Selection for Common Output Voltages VOUT (V) R1 (kΩ) R2 (kΩ) Rt (kΩ) Cf (pF) L ( μH) 1.0 20.5 84.5 82 15 2.2 1.2 30.1 61.9 82 15 2.2 1.8 40.2 32.4 56 15 3.3 2.5 40.2 19.1 33 15 3.3 3.3 40.2 13 33 15 5.5 5 40.2 7.68 33 15 5.5 Selecting the Inductor For most applications, use a 1µH-to-22µH inductor with a DC current rating that is at least 25% percent higher than the maximum load current. Select an inductor with a DC resistance less than 15mΩ for highest efficiency. For most designs, the inductance value can be derived from the following equation. OUT IN OUT 1 IN L OSC V (V V ) L V I f Where ΔI L is the inductor ripple current. Choose an inductor ripple current to be approximately 30% of the maximum load current. The maximum inductor peak current is: 2 I I I L LOAD ) MAX ( L Use a larger inductor for light-load conditions (below 100mA) for improved efficiency. Setting the AAM Voltage The AAM voltage sets the transition point from AAM to CCM. Select a voltage that balances efficiency, stability, ripple, and transient: A relatively low AAM voltage improves stability and ripple, but degrades transient and efficiency during AAM mode; a relatively high AAM voltage improves the transient and efficiency during AAM, but degrades stability and ripple. AAM voltage is set from the tap of a resistor divider from the VCC (5V) pin, as shown in Figure 5. Figure 5: AAM Network Generally, choose R5 to be around 100 kΩ, then R6 is: AAM CC AAM V R6 R5 VV Figure 6: AAM Selection for Common Output Voltages (VIN=4.5V to 16V) |
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