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參數(shù)資料
| 型號(hào)： | 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)： | 16/17頁 |
| 文件大?。?/td> | 203K |
| 代理商： | TB62754AFNG |
TB62754AFNG
2007-1-30
7
2 LED drive mode
Voltage booster block and constant current block are both drive mode. Voltage booster block controls its voltage
by monitoring FB voltage.
2-1 Constant current control and voltage booster operation
RSET2
Voltage B
FB6
RSET6
Voltage F
Ref circuit
RSENS2
RSENS6
LED
F
FB1
RSET1
Voltage A
FB2
ON/OFF
RSENS1
LED
A
LED
B
Output Voltage
Applied voltage to FB1 to FB6 changes depending on Vf variation of white LED.
The lowest voltage among "voltage A VRSENS1", "voltage B VRSENS2"
, and "voltage F VRSENS6" in figure1 is
determined as a reference value. And VOUT is controlled to set this reference voltage 1.25(Typ.).
Ex.
LED A: TOTAL Vf 25V
LED B: TOTAL Vf 24.5V
LED F: TOTAL Vf 25.5V
Output voltage is determined by referring "voltage F VRSENS6".
Output voltage 25.5V 1.25V 26.75V
In this case, voltage A is 1.5V, voltage B is 2V, and voltage F is 1V.
Applied voltage to each channel (FB1 to 6 changes depending on Vf variation of connected LED.
However, in case power consumption exceeds power dissipation, IC is destroyed. Take care in designing
by noticing the cautions below.
When applied voltage difference to FB pin is large, take care in determining current quantity per 1ch.
The power dissipation is 1.5W in condition of 25 .
1.5W
Applied voltage per channel Set current IC applied voltage IC consumption current
0
(*) Whenever IC ambient temperature exceeds 25 , 12.5mW should be lopped off from 1.5W shown above.
Ex. In case ambient temperature is 60 ,
1.5W 12.5mW 60
Applied voltage per channel Set current IC applied voltage IC consumption current
0
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TB62754AFNG(O,EL) | 功能描述:LED照明驅(qū)動(dòng)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(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| TB62755FPG(O,EL) | 功能描述:LED照明驅(qū)動(dòng)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(fēng)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(qū)動(dòng)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(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| TB62757FPG(O,EL) | 功能描述:LED照明驅(qū)動(dòng)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(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
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