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BD6586MUV Datasheet(PDF) 8 Page - Rohm |
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BD6586MUV Datasheet(HTML) 8 Page - Rohm |
8 / 24 page Datasheet 8/20 BD6586MUV www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111 ・15・001 TSZ02201-0G3G0C400190-1-2 10.Dec.2012 Rev.001 4.7 μF VDET SW LED 4 4.7 μH 6LED x 4Parallel GND Each 20mA 2.2 μF EN1 GND 24k Ω PGND Battery PWM LED2 LED 3 Power ON /OFF SW EN2 TEST ISET VBAT SW LED 1 TESTO TRSW GND PGND 6V to 25V Other Power Supply 2.7V to 5.5V ●The Separations of the IC Power Supply and Coil Power Supply This IC can work in separating the power source in both IC power supply and coil power supply. With this application, it can obtain that decrease of IC power consumption, and the applied voltage exceeds IC rating 5.5V. That application is shown in below Figure 9. The higher voltage source is applied to the power source of coil that is connected from an adapter etc. Next, the IC power supply is connected with a different coil power supply. When the coil power supply is applied, it is no any problem even though IC power supply is the state of 0V. Although IC power supply is set to 0V, pull-down resistance is arranged for the power off which cuts off the leak route from coil power supply in IC inside, the leak route is cut off. And, there is no power on-off sequence of coil power supply and IC power supply. Figure 9. Each battery and coil power supply ●The Coil Selection The DC/DC is designed by more than 4.7µH. When L value sets to a lower value, it is possibility that the specific sub-harmonic oscillation of current mode DC / DC will be happened. Please do not let L value to 3.3µH or below. And, L value increases, the phase margin of DC / DC becomes to zero. Please enlarge the output capacitor value when you increase L value. Example) 4.7µH = output capacitor 2.2µF/50V 1pcs 6.8µH = output capacitor 2.2µF/50V 2pcs 10µH = output capacitor 2.2µF/50V 3pcs This value is just examples, please made sure the final judgment is under an enough evaluation. ●The Adjustment of the Switching Wave Form A switching wave form between the coil and the switch terminal can be adjusted by connecting a capacitor to TRSW. Switching noise can be restrained though efficiency is made to decrease by connecting a capacitor. Decide capacity value after the enough evaluation when you adjust switching noise. TRSW PGND SW TRSW PGND SW Figure 10. The adjustment of the switching wave form |
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