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BD81A24MUV-M Datasheet(PDF) 29 Page - Rohm |
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BD81A24MUV-M Datasheet(HTML) 29 Page - Rohm |
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29 / 40 page  Datasheet Datasheet 29/36 BD81A24MUV-M/EFV-M TSZ02201-0T3T0C600070-1-2 © 2016 ROHM Co., Ltd. All rights reserved. 2016.10.19 Rev.003 www.rohm.com TSZ22111・15・001 Calculation of Power Consumption (Case of Buck Boost application) = × ・・・① Circuit Power +1 × × × ・・・② Boost FET Power +2 × × × ・・・③ Buck FET Power +{ × + ∆ × ( − 1)}× ・・・④ Current Driver Power + × × ・・・⑤ Built-in Boost FET Power _ = ( + ) × ∕ ( × ) ・・・⑥ Inductance Average Current = × 1.05 × ・・・⑦ LED Output Current = ( + ∆ ) × + ・・・⑧ DC/DC Output Voltage = × /( + ) ・・・⑨ Built-in Boost FET Current Pc[W] : IC Power Consumption Icc[A] : Max Circuit Current VCC [V] : Power Supply Voltage Ciss1[F] : Boost FET Gate Capacitance Ciss2[F] : Buck FET Gate Capacity VREG[V] : VREG Voltage Fsw[Hz] : Switching Frequency VLED[V] : LED Control Voltage ILED [A] : LED Output Current N : Number of LED in series M : Number of LED Parallel Vf [V] : LED Forward Voltage △Vf[V] : LED Vf tolerance RonFET[Ω] : Boost FET ON Resistance η : Efficiency <Sample Calculation> Buck Boost application, Icc=10mA, VCC=12V, Ciss1=65pF, Ciss2=2000pF, VREG=5V, Fsw=2200kHz, VLED=1V, ILED=50mA, N=7, M=4, Vf=3.5V, ∆Vf=0.5V, n=80%, RonFET=0.8Ω = (3.5 + 0.5 ) × 7 + 1 = 29 = 50 × 1.05 × 4 = 0.21 _ = (12 + 29 ) 12 ⁄ × 0.21 0.8 ⁄ = 0.897 = 0.897 × 29 (12 + 29 ) = 0.634 ⁄ = 10 × 12 + 65 × 5 × 2200 × 5 + 2000 × 5 × 2200 × 5 + {1.0 × 4 + 0.5 × (4− 1)} × 50 + 0.8 × 0.634 × 0.634 = 0.830[ ] The above mentioned is a simple calculation and sometimes the value may differ from the actual value. |
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