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| 型号： | BD6592MUV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 18/34页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT 24-VQFN |
| 标准包装： | 1 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 6 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 800kHz ~ 1.2MHz |
| 电源电压： | 2.7 V ~ 22 V |
| 输出电压： | 43V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-VFQFN 裸露焊盘 |
| 供应商设备封装： | VQFN024V4040 |
| 包装： | 标准包装 |
| 工作温度： | -30°C ~ 85°C |
| 产品目录页面： | 1372 (CN2011-ZH PDF) |
| 其它名称： | BD6592MUV-E2DKR |
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BD6592MUV
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
?LED current dispersion emphasis in the PWM brightness control
(Reference)
? 2) Power control PWM control
? 1) Current driver PWM control
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 28.
The current set up with ISETH is chosen as the Hi section of PWMDRV and the current is off as the Lo 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.
PW MDRV
LED current
Coil current
IC’s active current
ON
ON
ON
OFF
OFF
OFF
ON
Figure 41
2) Power control PWM control is controlled by providing PWM signal to PWMPOW, as it is shown Figure 29. The current
setting set up with PWMDRV logic is chosen as the Hi section and the current is off as the Lo 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 42
18 / 31
OFF
OFF
OFF
OFF
TSZ02201-0G3G0C400210-1-2
21.Dec.2012 Rev.001
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