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參數(shù)資料
| 型號： | TB62754AFNG |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PDSO20 |
| 封裝： | 0.65 MM, PLASTIC, LEAD FREE, SSOP-20 |
| 文件頁數(shù)： | 17/17頁 |
| 文件大?。?/td> | 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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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TB62754AFNG(O,EL) | 功能描述:LED照明驅動器 White LED Driver RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| TB62755FPG(O,EL) | 功能描述:LED照明驅動器 White LED Driver RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| TB62756FUG | 制造商:MARKTECH 制造商全稱:Marktech Corporate 功能描述:Step-up Type DC/DC Converter for White LEDs |
| TB62756FUG(O,EL) | 功能描述:LED照明驅動器 White LED Driver RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| TB62757FPG(O,EL) | 功能描述:LED照明驅動器 White LED Driver RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
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