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TPS61165 Fiches technique(PDF) 10 Page - Texas Instruments |
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TPS61165 Fiches technique(HTML) 10 Page - Texas Instruments |
10 / 33 page out out in _ DC in V I I V ´ = ´ h in lim p out _ max out V (I I / 2) I V ´ - ´ h = ú û ù ê ë é + - + ´ ´ = ) V 1 V V V 1 ( F L 1 I in in f out s P 10 TPS61165 SLVS790D – NOVEMBER 2007 – REVISED APRIL 2016 www.ti.com Product Folder Links: TPS61165 Submit Documentation Feedback Copyright © 2007–2016, Texas Instruments Incorporated 9 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 9.1 Application Information 9.1.1 Maximum Output Current The overcurrent limit in a boost converter limits the maximum input current and thus maximum input power for a given input voltage. Maximum output power is less than maximum input power due to power conversion losses. Therefore, the current limit setting, input voltage, output voltage and efficiency can all change maximum current output. The current limit clamps the peak inductor current; therefore, the ripple has to be subtracted to derive maximum dc current. The ripple current is a function of switching frequency, inductor value and duty cycle. The following equations take into account of all the above factors for maximum output current calculation. where • Ip = inductor peak to peak ripple • L = inductor value • Vf = Schottky diode forward voltage • Fs = switching frequency • Vout = output voltage of the boost converter. It is equal to the sum of VFB and the voltage drop across LEDs. (1) where • Iout_max = Maximum output current of the boost converter • Ilim = overcurrent limit • η = efficiency (2) For instance, when VIN is 3 V, 8 LEDs output equivalent to VOUT of 26 V, the inductor is 22 μH, the Schottky forward voltage is 0.2 V, the maximum output current is then 110 mA in typical condition. When VIN is 5 V, 10 LEDs output equivalent to VOUT of 32 V, the inductor is 22 μH, the Schottky forward voltage is 0.2 V, the maximum output current is 150 mA in typical condition. 9.1.2 Inductor Selection Selection of the inductor affects steady state operation as well as transient behavior and loop stability. These factors make it the most important component in power regulator design. There are three important inductor specifications, inductor value, DC resistance and saturation current. Considering inductor value alone is not enough. The inductor value determines the inductor ripple current. Choose an inductor that can handle the necessary peak current without saturating, according to half of the peak-to-peak ripple current given by Equation 1, pause the inductor DC current given by: (3) |
Numéro de pièce similaire - TPS61165_17 |
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Description similaire - TPS61165_17 |
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