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BD6586MUV
Datasheet
● 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.
Other Power Supply
6V to 25V
Battery
2.7V to 5.5V
4.7 μ F
4.7 μ H
2.2 μ F
6LED x 4Parallel
SW
SW
SW
VBAT
VDET
TRSW
EN2
Power
LED1
ON/OFF
EN1
PWM
LED2
LED3
TESTO
TEST
PGND PGND
GND
GND
GND
ISET
LED4
Each 20mA
24k ?
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.
SW
SW
TRSW PGND
TRSW
PGND
Figure 10. The adjustment of the switching wave form
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
8/20
TSZ02201-0G3G0C400190-1-2
10.Dec.2012 Rev.001
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