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BD6583MUV-A
Datasheet
● How to select the number of LED lines of the current driver
When the number of LED lines of the current driver is reduced, the un-select can be set the matter that the unnecessary
LED1 to 6 terminal is connected to GND. When it uses with 4 lines and so on, it can correspond to it by connecting 2
unnecessary lines to GND.
RSTB is used as a power supply of this decision circuit. The select of the terminal is judged, It has no relation to the logic of
PWMPOW and PWMDRV and it isn't judged an unnecessary LED line even if it is connected to GND when it is judged a
necessary terminal once. This information can be reset by setting RSTB at 0V.
● Start control and select LED current driver
BD6583MUV-A can control the IC system by RSTB, and IC can power off compulsory by setting 0.2V or below. Also, It
powers on PWMPOW is at more than 1.4V and RSTB is at more than 2.25V.
When RSTB=PWMPOW=H, ISETH current is selected at PWMDRV=H and ISETL current is selected at PWMDRV=L.
The starting current in PWMDRV=L sets OFF second time rise of PWMDRV and it becomes 0mA setting after that.
After RSTB sets L once, the starting current can be flowed again by changing it to H.
RSTB
H
H
H
H
L
PWMPOW
L
H
L
H
L, H
PWMDRV
L
L
H
H
L, H
IC
Off
On
Off
On
Off
LED current
OFF
Starting current decided with ISETL
OFF
Current decided with ISETH
OFF
● Attendance point of the restriction resistance input to RSTB
When the restriction resistance is input to RSTB, it is necessary to consider the input current of RSTB.
The input current of RSTB changes that depending on the power-supply voltage and the temperature reference to Figure
35.
Because the temperature characteristic of the input current is shown in Figure 35, please choose resistance for which the
voltage of the terminal can be guaranteed to 2.1V or more.
And, it has the margin in the decision of resistance, and please confirm and make sure it is no problem in a real application.
The decision example of restriction resistance
1.When use the current driver of 6 parallel
2.9V(to RSTB power-supply) - restriction resistance value × 124 μ A(100 ℃ input current) > 2.1V
restriction resistance value < (2.9-2.1)/124 μ A=6.45k ?
2.When use the current driver of 3 parallel
2.9V(to RSTB power-supply) - restriction resistance value × 430 μ A(100 ℃ input current) > 2.1V
restriction resistance value < (2.9-2.1)/430 μ A=1.86k ?
250
200
+100 ℃
+80 ℃
+25 ℃
BD6583MUV-A
150
-30 ℃
Power supply
for RSTB
Limit resistor
RSTB
terminal
100
RSTB input current
50
2.1
2.4
2.7
3
3.3
3.6
RSTB[V]
Figure 35. RSTB input current
Figure 36. RSTB terminal voltage-RSTB input current
(At the time of the current driver 6 lines use)
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
16/32
TSZ02201-0G3G0C400180-1-2
03.Dec.2012 Rev.001
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