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| 型号： | BD6592MUV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 15/34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
● 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
confirms and make sure it is no problem in a real application.
BD6592MUV
250
200
150
100
+100 ℃
+80 ℃
+25 ℃
-30 ℃
Power supply
Limit resistor
RSTB
50
2.1
2.4
2.7
3
3.3
3.6
for RSTB
RSTB inflow current
terminal
RSTB[V]
Figure 35. RSTB terminal voltage-RSTB inflow current
(At the time of the current driver six lines use)
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 ． 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 ?
In addition, the selection number of parallel number of the current driver is changed, the power-supply current of RSTB will
be increased. Because the maximum value of the consumption current at the RSTB=2.1V is indicated in the following Table
1, be careful enough when you calculate the restriction resistance.
Table1. The use parallel number of current driver at RSTB=2.1V , 100 ℃ vs. RSTB input current
Parallel numbers used for current driver
RSTB input current
6 0.12mA
5 0.23mA
4 0.33mA
3 0.43mA
2 0.53mA
1 0.63mA
0 0.74mA
● 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 terminals 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
BD6592MUV 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
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
15 / 31
TSZ02201-0G3G0C400210-1-2
21.Dec.2012 Rev.001
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