- 您现在的位置：买卖IC网 > Datasheet目录315 > BD6066EKN-E2 (Rohm Semiconductor)IC LED DRVR WHITE BCKLT 28-HVQFN Datasheet资料下载
参数资料
| 型号： | BD6066EKN-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 10/18页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLT 28-HVQFN |
| 标准包装： | 1 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 4 |
| 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： | 40.5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-VFQFN 裸露焊盘 |
| 供应商设备封装： | 28-HQFN |
| 包装： | 标准包装 |
| 工作温度： | -30°C ~ 85°C |
| 产品目录页面： | 1371 (CN2011-ZH PDF) |
| 其它名称： | BD6066EKN-E2DKR |
BD6066GU,BU6066EKN
● Setting of LED current and current range
LED current can set up resistance value (RISET) connecting to ISET,
Technical Note
ISET setting example
LED current setting range is 4mA~30mA.
Setting of LED current is given as shown below.
LED current = 20mA × ( 24k ? / RISET)
The current in the standard application is as shown below.
RISET=24k ? , LED current=20mA
● Brightness control
RISET
24.0 k ? (E24)
25.5 k ? (E96)
27.0 k ? (E12)
28.0 k ? (E96)
30.0 k ? (E24)
33.0 k ? (E6)
LED current
20.0mA
18.8mA
17.8mA
17.1mA
16.0mA
14.5mA
PWM brightness adjustment is made by inputting PWM pulse to PWM pin.
The electric current select setting with ISET in the Hi section, and the Lo section turns off the electric current. Lo.
The average current increases in proportion with the duty cycle of PWM signal. By this method, IC can power off at the OFF
time, the IC and LED both consume no currents, thus providing a high-efficiency operation.
The recommended PWM frequency is 100Hz ~ 300Hz.
<ON time limit>
On time is necessary more than 750 μ s (at the time of 200Hz, 15%) to require the start up-time of 750 μ s.
< OFF time limit >
OFF time is approximated by the following parameter.
External output capacitor : Cvout
LED current setting : ILED (worst = +5%)
LED sequence number : NPLED
LED series number : NSLED
VF tolerance of LED terminal : ? VF
Reaction time of internal circuit : 10 μ s (worst = 15 μ s)
Necessary time for OFF (typ) = Cvout × (( ? VF × NSLED) + 0.5V)/(ILED × NPLED)+10 μ s
(example)
Necessary time for OFF (typ) = 2 μ F × ((0.2V × 10 lights) + 0.5V)/(20mA × 4)+10 μ s = 72.5 μ s
<PWM=200Hz, duty1.5% equivalent>
Please use worst value of each parameter when you calculate the worst time.
(example)
Necessary time for OFF (worst) = (2 μ F × 1.3) × ((0.26V × 10 lights) + 0.7V)/((20mA × 1.05) × 4)+15 μ s =117 μ s
<PWM=200Hz, duty2.3% equivalent >
And please don’t use ON time under 750 μ s or under OFF time calculated in the above of current setting for the brightness
control, because power-on/off has very influential.
● Noise of ceramic capacitor by PWM brightness control
In order to use a ceramic capacitor as the output capacitor, noise of capacitor occurs by the kind of the circuit board and
mounted method, the mounting place.
As for the noise cause, the resonant of ceramic capacitor and the board give cause by output voltage fluctuation.
Measures of this trouble are shown.
(1) Ceramic capacitor is changed to tantalum capacitor.
By changing to tantalum capacitor, noise is stopped because of changing ceramic capacitor itself bringing about the noise.
But, as the output ripple increases by ESR that is characteristic of the tantalum, it needs to select tantalum with low ESR.
Also, it recommends connecting parallel capacitor for the noise measure of 0.1μF
Recommended capacitor is shown next page.
(2) Ceramic capacitor is floated from the top of the circuit board.
Reducing the contact surface of the ceramic capacitor and the circuit board can reduce the noise.
Capacitor that can float a capacitor from the circuit board are as shown below. This capacitor is connected the metal cap both
electrodes of the capacitor, so It can have the effect which be floated because the metal cap is connected to the circuit board.
Recommended capacitor is shown next page.
The metal cap
CKG45NX7R2A225N (TDK)
The circuit board
Fig.31 The metal cap capacitor
www.rohm.com
? 2011 ROHM Co., Ltd. All rights reserved.
10/15
2011.06 - Rev.B
相关PDF资料 |
PDF描述 |
|---|---|
| BD6069GUT-E2 | IC LED DRIVR WHITE BCKLGT 8-VCSP |
| BD6081GVW-E2 | IC LED DRIVER BACKLIGHT 63SBGA |
| BD6083GUL-E2 | IC LED DRIVER BKLT 36VCSP50L3 |
| BD6085GUL-E2 | IC LED DRIVER BKLT 35VCSP50L3 |
| BD6088GUL-E2 | IC LED DRIVER BKLT 36VCSP50L3 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| BD6066GU | 制造商:ROHM 制造商全称:Rohm 功能描述:White Backlight LED Drivers for Medium to Large LCD Panels (Switching Regulator Type) |
| BD6066GU_11 | 制造商:ROHM 制造商全称:Rohm 功能描述:White Backlight LED Drivers for Medium to Large LCD Panels (Switching Regulator Type) |
| BD6066GU-E2 | 功能描述:LED照明驱动器 White LED Driver 3.1-22V;1Mhz;48 LEDs RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| BD6067GU | 制造商:ROHM 制造商全称:Rohm 功能描述:White Backlight LED Drivers for Small to Medium LCD Panels (Switching Regulator Type) |
| BD6067GU_11 | 制造商:ROHM 制造商全称:Rohm 功能描述:White Backlight LED Drivers for Small to Medium LCD Panels (Switching Regulator Type) |
发布紧急采购，3分钟左右您将得到回复。