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BD6581GU
Datasheet
● LED Current Setting Range
LED current can set up Normal and Starting setting current.
LED current can set up Normal current by resistance value (RISETH) connecting to ISETH voltage and LED current can set
Starting current by resistance value (RISETL) connecting to ISETL voltage.
Setting of each LED current is given as shown below.
Normal current = 20mA (24k ? /RISETH) Starting constant current = 0.6/RISET L
Also, Normal current setting range is 10mA to 25mA, Starting current setting range is OFF setting or 1μA to 100μA.
LED current can set OFF setting by open setting ISETL pin.
LED current becomes a leak current MAX 1μA at OFF setting.
ISETH Normal current setting example
RISETH LED current
ISETL Starting current setting example
RISETL LED current
24k ? (E24)
25.5 k ? (E96)
27 k ? (E12)
28k ? (E96)
30k ? (E24)
33k ? (E6)
20mA
18.8mA
17.8mA
17.1mA
16.0mA
14.5mA
6.2k ? (E24)
10k ? (E6)
47k ? (E6)
100 k ? (E6)
560 k ? (E12)
Connect to VREG pin
97μA
60μA
13μA
6μA
1.1μA
0mA
● 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 22V.
That application is shown in below figure 39. 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. Under the
conditions for inputting from 2.7V to 5.5V into IC VBAT, please follow the recommend design in figure 35. It connects
VBAT terminal and VREG terminal together at IC outside.
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.
Coil Power supply
7V to 28V
Battery
10 μ F
4.7 μ H
2.2 μ F
10LED x 6
RTR020N05
SW
SENSP
FAILSEL
VDET
100m ?
SENSN
Power
ON/OFF
RSTB
PWMDRV
LED1
200Hz
PWM
PWMPOW
LED2
LED3
IC Power supply
2.7V to 5.5V
1 μ F
VBAT
VREG
LED4
LED5
GND GND GND GND TEST ISETH ISETL LED6
20mA each
24k ?
Figure 39. Application at the time of power supply isolation
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
19/32
TSZ02201-0G3G0C400170-1-2
03.Dec.2012 Rev.001
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