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## TPS61165DRVTG4 Datasheet(PDF) 14 Page - Texas Instruments

 Part # TPS61165DRVTG4 Description High Brightness White LED Driver in 2mm x 2mm QFN and SOT-23 Packages Download 26 Pages Scroll/Zoom 100% Manufacturer TI [Texas Instruments] Direct Link http://www.ti.com Logo

## TPS61165DRVTG4 Datasheet(HTML) 14 Page - Texas Instruments

 14 / 26 pageúûùêëé+-+´´=)V1VVV1(FL1IininfoutsPIout_max+VinIlim * IP 2hVoutIin_DC +VoutIoutVinhTPS61165SLVS790A – NOVEMBER 2007 – REVISED MAY 2010www.ti.comAPPLICATION INFORMATIONMAXIMUM OUTPUT CURRENTThe overcurrent limit in a boost converter limits the maximum input current and thus maximum input power for agiven 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 currentoutput. The current limit clamps the peak inductor current; therefore, the ripple has to be subtracted to derivemaximum DC current. The ripple current is a function of switching frequency, inductor value and duty cycle. Thefollowing equations take into account of all the above factors for maximum output current calculation.(3)Where:Ip = inductor peak to peak rippleL = inductor valueVf = Schottky diode forward voltageFs = switching frequencyVout = output voltage of the boost converter. It is equal to the sum of VFB and the voltage drop across LEDs.(4)whereIout_max = Maximum output current of the boost converterIlim = over current limith = efficiencyFor instance, when VIN is 3V, 8 LEDs output equivalent to VOUT of 26V, the inductor is 22mH, the Schottkyforward voltage is 0.2V; and then the maximum output current is 110mA in typical condition. When VIN is 5V, 10LEDs output equivalent to VOUT of 32V, the inductor is 22mH, the Schottky forward voltage is 0.2V; and then themaximum output current is 150mA in typical condition.INDUCTOR SELECTIONThe selection of the inductor affects steady state operation as well as transient behavior and loop stability. Thesefactors make it the most important component in power regulator design. There are three important inductorspecifications, inductor value, DC resistance and saturation current. Considering inductor value alone is notenough.The inductor value determines the inductor ripple current. Choose an inductor that can handle the necessarypeak current without saturating, according to half of the peak-to-peak ripple current given by Equation 3, pausethe inductor DC current given by:(5)Inductor values can have ±20% tolerance with no current bias. When the inductor current approaches saturationlevel, its inductance can decrease 20% to 35% from the 0A value depending on how the inductor vendor definessaturation current. Using an inductor with a smaller inductance value forces discontinuous PWM when theinductor current ramps down to zero before the end of each switching cycle. This reduces the boost converter’smaximum output current, causes large input voltage ripple and reduces efficiency. Large inductance valueprovides much more output current and higher conversion efficiency. For these reasons, a 10mH to 22mHinductor value range is recommended. A 22mH inductor optimized the efficiency for most application whilemaintaining low inductor peak to peak ripple. Table 3 lists the recommended inductor for the TPS61165. Whenrecommending inductor value, the factory has considered –40% and +20% tolerance from its nominal value.14Submit Documentation FeedbackCopyright © 2007–2010, Texas Instruments IncorporatedProduct Folder Link(s): TPS61165

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