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MPQ4559DN Datasheet(PDF) 11 Page - Monolithic Power Systems |
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MPQ4559DN Datasheet(HTML) 11 Page - Monolithic Power Systems |
11 / 19 page MPQ4559 – 1.5A, 2MHz, 55V STEP-DOWN CONVERTER AEC-Q100 QUALIFIED MPQ4559 Rev. 1.01 www.MonolithicPower.com 11 6/9/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. APPLICATION INFORMATION COMPONENT SELECTION Setting the Output Voltage The output voltage is set using a resistive voltage divider from the output voltage to FB pin. The voltage divider divides the output voltage down to the feedback voltage by the ratio: FB OUT R2 V =V R1+R2 Thus the output voltage is: OUT FB R1+R2 V =V R2 For example, the value for R2 can be 10kΩ. With this value, R1 can be determined by: OUT R1=12.5 (V -0.8)(K Ω) For example, for a 3.3V output voltage, R2 is 10kΩ, and R1 is 31.6kΩ. Inductor The inductor is required to supply constant current to the output load while being driven by the switched input voltage. A larger value inductor will result in less ripple current that will result in lower output ripple voltage. However, the larger value inductor will have a larger physical size, higher series resistance, and/or lower saturation current. A good rule for determining the inductance to use is to allow the peak-to-peak ripple current in the inductor to be approximately 30% of the maximum switch current limit. Also, make sure that the peak inductor current is below the maximum switch current limit. The inductance value can be calculated by: OUT OUT s L IN VV L1= (1- ) f ΔI V Where VOUT is the output voltage, VIN is the input voltage, fS is the switching frequency, and ∆IL is the peak-to-peak inductor ripple current. Choose an inductor that will not saturate under the maximum inductor peak current. The peak inductor current can be calculated by: IN OUT S OUT LOAD LP V V 1 1 L f 2 V I I Where ILOAD is the load current. Table 1 lists a number of suitable inductors from various manufacturers. The choice of which style inductor to use mainly depends on the price vs. size requirements and any EMI requirement. |
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