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TPS61301 Datasheet(PDF) 64 Page - Texas Instruments |
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TPS61301 Datasheet(HTML) 64 Page - Texas Instruments |
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64 / 77 page  OUT OUT IN IN L(PEAK) OUT I V V V D I = + with D = 2 f L (1 D ) V - ´ ´ ´ - ´ h OUT L OUT IN V I I η V » ´ ´ TPS61300 TPS61301 TPS61305, TPS61305A SLVS957D – JUNE 2009 – REVISED OCTOBER 2012 www.ti.com APPLICATION INFORMATION INDUCTOR SELECTION A boost converter requires two main passive components for storing energy during the conversion. A boost inductor and a storage capacitor at the output are required. The TPS6130x device integrates a current limit protection circuitry. The valley current of the PMOS rectifier is sensed to limit the maximum current flowing through the synchronous rectifier and the inductor. The valley peak current limit (250mA/500mA/1250mA/1750mA) is user selectable via the I2C interface. In order to optimize solution size the TPS6130x device has been designed to operate with inductance values between a minimum of 1.3 μH and maximum of 2.9 μH. In typical high current white LED applications a 2.2μH inductance is recommended. The highest peak current through the inductor and the power switch depends on the output load, the input and output voltages. Estimation of the maximum average inductor current and the maximum inductor peak current can be done using Equation 2 and Equation 3: (2) (3) With f = switching frequency (2MHz) L = inductance value (2.2 μH) η = estimated efficiency (85%) The losses in the inductor caused by magnetic hysteresis losses and copper losses are a major parameter for total circuit efficiency. Table 4. List of Inductors MANUFACTURER SERIES DIMENSIONS ILIM SETTINGS MIPST2520 2.5mm x 2.0mm x 0.8mm max. height FDK MIP2520 2.5mm x 2.0mm x 1.0mm max. height 250mA (typ.) MIPSA2520 2.5mm x 2.0mm x 1.2mm max. height 500mA (typ.) LQM2HP-G0 2.5mm x 2.0mm x 1.0mm max. height MURATA LQM2HP-GC 2.5mm x 2.0mm x 1.0mm max. height TDK VLF3014AT 2.6mm x 2.8mm x 1.4mm max. height COILCRAFT LPS3015 3.0mm x 3.0mm x 1.5mm max. height 1250mA (typ.) MURATA LQH2HPN 2.5mm x 2.0mm x 1.2mm max. height TOKO FDSE0312 3.0mm x 3.0mm x 1.2mm max. height 1750mA (typ.) MURATA LQM32PN 3.2mm x 2.5mm x 1.2mm max. height INPUT CAPACITOR For good input voltage filtering low ESR ceramic capacitors are recommended. A 10- μF input capacitor is recommended to improve transient behavior of the regulator and EMI behavior of the total power supply circuit. The input capacitor should be placed as close as possible to the input pin of the converter. 64 Submit Documentation Feedback Copyright © 2009–2012, Texas Instruments Incorporated Product Folder Links: TPS61300 TPS61301 TPS61305 TPS61305A |
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