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BD9206EFV Datasheet(PDF) 9 Page - Rohm |
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BD9206EFV Datasheet(HTML) 9 Page - Rohm |
9 / 13 page Technical Note 9/12 BD9206EFV www.rohm.com 2009.07 - Rev.A © 2009 ROHM Co., Ltd. All rights reserved. ●The calculation of electric power consumption for IC and the deciding method of external resistance value Electric power consumption of IC is decided with formula below. P(N)=ICC*VCC+[(Vo-RL*ILED)-(Vf+⊿Vf+⊿VfT)*M]*N*ILED ・・・・① ICC IC Consumed electric current VCC Input voltage Vf LED Vf voltage (normal temperature typ) ⊿Vf LED Vf Variation ⊿VfT LED Vf Temperature variation M Stage number around LED 1 line N LED line number ILED LED Constant current value Vo Voltage OF LED anode side RL external resistance (external loss) Please insert the heat-radiation resistor RL in order to decrease the heat radiation at the IC. If the value of RL is made to be larger, then the heat radiation of the IC is decreased, but if the terminal voltage VLED of the LED driver is less than 0.6V, then the constant current operation becomes impossible, therefore please set the RL in such a way that the following expression is met: VLED=Vo-(Vf+⊿Vf+⊿VfT)*M-RL*ILED>0.6V Please set the ILED and RL in such a way that the relational expressions ① & ② are met. Moreover, the permissible loss of the package is as shown in the following graph. VF Vo *M *N ILED RL : : : : : : : : : : HT SS OP- B2 0 Pd 1. 0 0 2. 3 0 3. 20 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0 2 5 5 0 75 10 0 12 5 1 50 周囲温度Ta(℃) ①:1層基板 (表層放熱銅箔: 0mm2 ②:2層基板 (表裏層放熱銅箔: 4900mm2) ③:4層基板 (全層放熱銅箔: 4900mm2 ① ② ③ Fig..9 Fig..10 ①1layer baseplate (Heat dissipation copper foil on surface : Omm2) Temperature around Ta (℃) ②2layer base―plate (Heat dissipation copper foil on Inside and outside layer : 4900mm2) ③4layer base―plate (Heat dissipation copper foil on whole layer :4900mm2) |
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