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参数资料
| 型号： | TB62754AFNG |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, PDSO20 |
| 封装： | 0.65 MM, PLASTIC, LEAD FREE, SSOP-20 |
| 文件页数： | 17/17页 |
| 文件大小： | 203K |
| 代理商： | TB62754AFNG |
TB62754AFNG
2007-1-30
8
3 Constant current drive standby mode
Constant current block stops operating. Only voltage booster block drives.
Voltage booster block keeps its voltage 20V (Typ.) by monitoring OVP.
Explanation of PWM dimmer control
LED luminance is adjusted by switching LED drive mode and constant current drive standby mode. PWM signal is input to PWM pin
and switches these 2 modes.
Voltage booster block starts driving by inputting high to SHDN pin.
VOUT starts rising at the set time with soft-start function.
LED current is not generated because PWM pin is input low and VOUT is controlled to 20V(Typ.).
LED current generates because SHDN is input high and PWM is input high.
VOUT is controlled by FB voltage.
Circuit delay is generated when LED current starts after PWM is input high.
This time is defined as tON in specification table.
Time passed since PWM is input low, and VOUT decreases with discharging.
However, VOUT keeps 20V (Typ.) because SHDN is input high.
SHDN is input low and the IC moves to shutdown mode.
Notice:
When SHDN pin and PWM pin are turned on at the same time, VOUT has not had prepared voltage because
of the soft-start function. So, ILED is different from the set current until VOUT has enough voltage.
SHDN
PWM
VOUT
ILED
tON
tOFF
20V(TYP)
Soft Start
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TB62754AFNG(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 |
| TB62755FPG(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 |
| TB62756FUG | 制造商:MARKTECH 制造商全称:Marktech Corporate 功能描述:Step-up Type DC/DC Converter for White LEDs |
| TB62756FUG(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 |
| TB62757FPG(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 |
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