- 您现在的位置：买卖IC网 > PDF目录98166 > TB62757FUG SWITCHING REGULATOR, 1430 kHz SWITCHING FREQ-MAX, PDSO6 PDF资料下载
参数资料
| 型号： | TB62757FUG |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 1430 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | 0.95 MM, PITCH, LEAD FREE, PLASTIC, SSOP-6 |
| 文件页数： | 17/20页 |
| 文件大小： | 516K |
| 代理商： | TB62757FUG |
TB62757FUG
2006-02-206
6
Brightness Control Method
Recommended Brightness Control Circuits are 4 types.
1) Input PWM signal to SHDN terminal
IF can be adjusted with PWM signal by inputting it to SHDN terminal.
[Notice]
<<Minimum ON-time of PWM signal input>>
Set the minimum ON-time or OFF-time 33 s or more in inputting the PWM signal.
Set the Duty ratio satisfying the condition above.
Ex) In case PWM Frequency is 1 kHz,
1 kHz is 1 ms (PWM Width
= 100%) and it takes 10 s per 1%.
To set the pulse width 33
s or more, necessary ON-or-OFF-time is calculated below.
33
s ÷ 10 s = 3.3% (Under the condition that 10 s equals 1%.)
Finally, the Duty Ratio can be set in range of 3.3% to 96.7%.
<<PWM signal frequency>>
The recommended PWM signal frequency is from 100 Hz to 10 kHz. There is a possibility to arise
the audible frequency in mounting to the board because it is within the auditory area.
<<Constant number of external capacitor>>
To reduce the fluctuation of input current and increase the accuracy of brightness, the values that
C1 = 4.7 (F) or more, C2 = 0.1 (F) or less are recommended.
When the PWM signal is off, the time to drain C2 of charge depends on the constant number. And
so, the actual value is little different from the theoretical value.
<<PWM input signal>>
Set the amplitude of PWM signal within the range of SHDN terminal specification.
<<Rush current in inputting>>
In case dimming by inputting the PWM signal to the SHDN terminal, this IC turns on and off
repeatedly.
And the rush current, which provides the charge to C2, arises in turning on. Take care in selecting
the condenser.
<<Current value in control with PWM: Ideal equation>>
]
[
[%]
×
]
[
=
)
(
R
Duty
ON
mV
325
mA
I
SENS
F
1 ms (1 kHz)
= 100%
Set On-time
Set Off-time
33
s or more = 3.3%
Available Duty Ratio
(3.3% to 96.7%)
33
s or more = 3.3%
相关PDF资料 |
PDF描述 |
|---|---|
| TB6512AFG | STEPPER MOTOR CONTROLLER, 0.12 A, PDSO24 |
| TB6513AF | BRUSHLESS DC MOTOR CONTROLLER, PQFP64 |
| TB6520P | BRUSHLESS DC MOTOR CONTROLLER, PDIP16 |
| TB6524FN | BRUSH DC MOTOR CONTROLLER, 0.1 A, PDSO16 |
| TB6525F | BRUSHLESS DC MOTOR CONTROLLER, PQFP64 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TB62757FUG(O,EL) | 功能描述:LED照明驱动器 White LED Driver 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 |
| TB62758FTG(O,EL) | 制造商:Toshiba 功能描述:LED Driver IC |
| TB62763FMG(O,8,EL) | 制造商:Toshiba America Electronic Components 功能描述:Step Up Type DC-DC Converter |
| TB62771FTG(O,8,EL) | 制造商:Toshiba America Electronic Components 功能描述:LARGE-CURRENT LED DRIVER INCORPORATING DC/DC CONTROLLER FOR - Tape and Reel 制造商:Toshiba America Electronic Components 功能描述:IC LED DVR DC/DC REG 20WQFN |
| TB62777AFNG(O,EL) | 制造商:Toshiba America Electronic Components 功能描述: |
发布紧急采购，3分钟左右您将得到回复。