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BD6583MUV-A
Datasheet
● Brightness control
There are two dimming method is available, first method is analog dimming that apply analog voltage to ISET terminal, and
second method is PWM control via digital dimming of PWMPOW or PWMDRV. Because each method has the different
merit, please choose a suitable method for the application of use.
Two techniques can be used as digital dimming by the PWM control One is PWM control of current driver, the other is PWM
control of power control.
As these two characteristics are shown in the below, selects to PWM control process comply with application.
?Efficiency emphasis in the low brightness which has an influence with the battery life
?
2)
Power
control
PWM
control
?LED current dispersion emphasis in the PWM brightness control
?
1)
Current
driver
PWM
control
(Reference)
PWM regulation process
Current driver
Power control
Efficiency of LED current 0.5mA
(PWM Duty=2.5%)
70%
93%
PWM frequency 200Hz
Limit dispersion capability of low duty
0.2%
0.5%
1) Current driver PWM control is controlled by providing PWM signal to PWMDRV, as it is shown Figure 42.
The current set up with ISETH is chosen as the H section of PWMDRV and the current is off as the L section. Therefore, the
average LED current is increasing in proportion to duty cycle of PWMDRV signal. This method that it lets internal circuit and
DC/DC to work, because it becomes to switch the driver, the current tolerance is a few when the PWM brightness is
adjusted, it makes it possible to brightness control until 20μs (MIN0.4% at 200Hz). And, don't use for the brightness control,
because effect of ON/OFF changeover is big under 20μs ON time and under 20μs OFF time. There is no effect of ON/OFF
changeover at 0% and 100%, so there is no problem on use. Typical PWM frequency is 100Hz to 10kHz. When resistance is
set as ISET, RSTB sets H ? L, so the starting current may be effective, after RSTB sets L ? H, it becomes PWM of the
starting current and PWM of ISETH setting current to PWM two times.
PWMDRV
LED current
Coil current
IC’s active current
ON
ON
ON
OFF
OFF
OFF
ON
Figure 42.
2) Power control PWM control is controlled by providing PWM signal to PWMPOW, as it is shown Figure 43. The current
setting set up with PWMDRV logic is chosen as the H section and the current is off as the L section. Therefore, the
average LED current is increasing in proportion to duty cycle of PWMPOW signal. This method is, because IC can be
power-off at off-time, the consumption current can be suppress, and the high efficiency can be available, so it makes it
possible to brightness control until 50μs (MIN1% at 200Hz). And, don't use for the brightness control, because effect of
power ON/OFF time changeover is big under 50μs ON time and under 50μs OFF time. There is no effect of ON/OFF
changeover at 0% and 100%, so there is no problem on use.
Typical PWM frequency is 100Hz to 1kHz. Also, PWM can't control RSTB and PWMPOW at the same time.
After RSTB sets H, control PWM only PWMPOW.
PWMPOW
LED current
Coil current
IC’s active current
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
ON
ON
ON
ON
Figure 43.
19/32
OFF
OFF
OFF
OFF
TSZ02201-0G3G0C400180-1-2
03.Dec.2012 Rev.001
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