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RT5508 Datasheet(PDF) 54 Page - Richtek Technology Corporation |
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RT5508 Datasheet(HTML) 54 Page - Richtek Technology Corporation |
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54 / 57 page  RT5508 Copyright © 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation www.richtek.com DS5508-01 March 2017 54 Application Information Inductor Selection The recommended value of inductor for DC-to-DC boost converter applications is 1 H. Small size and better efficiency are the major concerns for portable devices, such as the RT5508 used for mobile phone. The inductor should have low core loss at 1MHz (Min.) and low DCR for better efficiency. The minimum effective inductance should be higher than 0.7 H. The maximum current of inductor is highly depends on the speaker impedance which determines the output current of the boost converter. The inductor saturation current rating should be considered to cover the inductor peak current which can be approximated by the following equation : OUT OUT IN S L_max IN Boost V I V D T I = + η V 2 L Following is the inductor selection reference for typical speaker impedances with 10% tolerance and 95% efficient. RL (Ω) IOUT (A) IL(max) (A) Manufacturer Part Number 8 1.14 1.43 Murata MDT2520-CN1ROM 6 1.52 1.81 Coilcraft PFL2512-102MEB 4 2.28 2.57 Coilcraft LPS4012-102NLB Capacitor Selection For low ripple voltage, ceramic capacitors with low ESR are recommended. A real (as opposed to ideal) capacitor can be modeled simply as a resistor in series with an ideal capacitor. The voltage drop across this resistor minimizes the beneficial effects of the capacitor in the circuit. X5R and X7R types are suitable because of their wide voltage range and good operating temperature characteristics. The capacitance value decreases over the DC-biasing voltage range (30% to 70% decrease) as following figure. Consequently, the nominal DC rating of the capacitor should be close to twice the maximum application voltage value. When select capacitor, please notice the DC bias characteristics. The RT5508 minimum effective CVBST capacitance should be higher than 6 F. Worst X5R & Y5V Capacitance vs. DCV re. Voltage Rating 0% 20% 40% 60% 80% 100% 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% DC Voltage Relative to DCV Rating X5R Y5V |
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