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RLT16324R680FN-06 Datasheet(PDF) 11 Page - STMicroelectronics |
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RLT16324R680FN-06 Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 34 page AN3151 Overview of inverse buck converter Doc ID 17051 Rev 1 11/34 The output voltage =VLED = N* VF(Typical)=40 V Where N=Number of LEDs per string=10 and Vf is the typical forward voltage (4 V). Forward voltage has some variation in respect to the typical value and the LED manufacturer reports also the minimum forward voltage Vfmin and maximum forward voltage Vfmax. These values must be considered for dimensioning of the power converter. The LED characteristics are strongly dependent on manufacturer and are reported in their corresponding datasheets. In particular, these are necessary to calculate the duty cycle variation range. Design spec calculation: Equation 2 Equation 3 δ=Ton/Ts and expressed in terms of voltage for a buck converter: Equation 4 Equation 5 Equation 6 The current ripple admitted for this application is less than 10 % depending on the following formula: Equation 7 ILEDAVG = Average LED current ΔI LED 10 % Ripple current on the LEDs Table 1. Electrical specs (continued) Description Symbol Value Unit VOUTmin= VLEDmin=N*Vfmin=10*3.85 V=38.5 V VOUTmax=VLEDmax=N*Vfmax=10*4.15 V=41.5 V δ=Vout/Vin δmin= V OUTmin/Vin=80.2 % δmax= V OUTmax/Vin=86.4 % ⎪ ⎩ ⎪ ⎨ ⎧ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − = Δ ≤ Δ = Δ Vin Vout 1 L * Fs Vout I % 10 I I min min L L LED |
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