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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： | 16/17页 |
| 文件大小： | 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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