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DLPA3005 Datasheet(PDF) 23 Page - Texas Instruments |
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DLPA3005 Datasheet(HTML) 23 Page - Texas Instruments |
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23 / 75 page  OUT SWITCH OUT RIPPLE _ I RIPPLE _ LED C f 8 I k V b b b kHz 15 C L 2 1 f OUT OUT RES b b 5 b SWITCH OUT RIPPLE _ I OUT IN IN OUT OUT f I k ) V V ( V V L b b b LOUT 1µH 20A 100n 16V COUT 2x68µ 10V Low_ESR SYSPWR 2x68µ 16V ILLUM_A_PGND ILLUM_A_VIN ILLUM_A_SW ILLUM_A_BOOST ILLUMINATION DRIVER A ILLUM_A_FB 29 32 31 28 30 VLED ILLUM_HSIDE_DRIVE ILLUM_LSIDE_DRIVE 27 26 R G CG RG D G D G CG DLPA3005 www.ti.com DLPS071 – OCTOBER 2015 Feature Description (continued) Figure 6. Typical Illumination Driver Configuration Several factors determine the component selection of the buck converter, such as input voltage (SYSPWR), desired output voltage (VLED) and the allowed output current ripple. Configuration starts with selecting the inductor LOUT. The value of the inductance of a buck power stage is selected such that the peak-to-peak ripple current flowing in the inductor stays within a certain range. Here, the target is set to have an inductor current ripple, kI_RIPPLE, less than 0.3 (30%). The minimum inductor value can be calculated given the input and output voltage, output current, switching frequency of the buck converter (ƒSWITCH= 600 kHz), and inductor ripple of 0.3 (30%): (1) Example: VIN= 12 V, VOUT= 4.3 V, IOUT= 16 A results in an inductor value of LOUT= 1 µH Once the inductor is selected, the output capacitor COUT can be determined. The value is calculated using the fact that the frequency compensation of the illumination loop has been designed for an LC-tank resonance frequency of 15 kHz: (2) Example: COUT= 110 µF given that LOUT= 1 µH. A practical value is 2 × 68 µF. Here, a parallel connection of two capacitors is chosen to lower the ESR even further. The selected inductor and capacitor determine the output voltage ripple. The resulting output voltage ripple VLED_RIPPLE is a function of the inductor ripple kI_RIPPLE, output current IOUT, switching frequency ƒSWITCH and the capacitor value COUT: (3) Example: kI_RIPPLE= 0.3, IOUT= 16 A, ƒSWITCH= 600 kHz and COUT= 2 x 68 µF results in an output voltage ripple of VLED_RIPPLE= 7 mVpp As can be seen, this is a relative small ripple. Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback 23 |
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