- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄361356 > T6319A (Electronic Theatre Controls, Inc.) High Efficiency 2X charge Pump PDF資料下載
參數(shù)資料
| 型號(hào)： | T6319A |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | High Efficiency 2X charge Pump |
| 中文描述： | 高效率2倍充電泵 |
| 文件頁(yè)數(shù)： | 7/9頁(yè) |
| 文件大?。?/td> | 100K |
| 代理商： | T6319A |
TE
CH
tm
T6319A
Flash LED Driver
The T6319A can source 250mA for pulsed loads up to 500ms from an input supply as low as 3.3V.
This makes the device well suited for low-cost flash LED driver applications in portable poducts.
Typically the 4.5V output version of the T6319A should be selected for photo-flash LED
applications, as it can maintain better voltage regulation at higher pulsed load current levels (refer to
figure “Flash LED Application”). The limitation of this option is that the greatest flash LED forward
voltage (V
F
) that can be driven is 4.5V at the maximum set forward current (I
F
) for the application.
Flash LEDs with forward voltage (V
F
) levels up to 5.0V can be driven by the T6319A 5.0V output
option. However, the maximum current for a 500ms pulse will be reduced. Refer to the Typical
Characteristics curves for peak output current levels for a given minimum input voltage.
The forward current (I
F
) through the flash LED may be determined with the use of a series ballast
resistor. The typical forward voltage (V
F
) for the flash LED in a given application should be derived
from the LED manufacturer's datasheet for the desired forward current (I
F
) of the flash application.
Once the forward current has been determined, the flash ballast resistor can be calculated using the
following equation:
R
F
=(V
OUT
-V
F
)/I
F
Where: R
F
=Flash ballast resistor value in ohms
V
OUT
=Regulated charge pump output voltage (typically 4.5V)
V
F
= Flash LED forward voltage at the desired forward current
I
F
=Desired LED forward current
The flash LED function can be controlled by the T6319A enable pin in most applications. The
device start-up time into maximum load is about 200μs, this eliminating the need for pre-flash
control synchronization. If “l(fā)ight” or “movie” mode is also needed along with the flash function,
this can be accomplished with the addition of a second ballast resistor with a flash function gating
MOSFET switch as shown in Figure “Flash LED Driver with Gated Flash Application”. Refer to
the following equations for the calculation of flash and light resistors, R
F
and R
L
.
R
L
=(V
OUT
-V
F
)/I
F
Where: R
L
=Light mode ballast resistor value in ohms
V
OUT
=Regulated charge pump output voltage (typically 4.5V)
V
F
= Flash LED forward voltage at the desired forward current
I
F
=Desired LED forward current in “l(fā)ight” mode
R
F
=[(V
OUT
-V
F
)/I
F
] - R
DS
Where: R
F
= Flash ballast resistor value in ohms
V
OUT
=Regulated charge pump output voltage (typically 4.5V)
V
F
=Flash LED forward voltage at the desired forward current
I
F
=Desired LED forward current
R
DS
= flash gating MOSFET on resistance
TM Technology Inc. reserves the right
P. 7
Publication Date: MAY. 2007
to change products or specifications without notice.
Revision: A
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| T6319A-25AXG | High Efficiency 2X charge Pump |
| T6319A-30AXG | High Efficiency 2X charge Pump |
| T6319A-40AXG | High Efficiency 2X charge Pump |
| T6319A | High Efficiency 2X charge Pump |
| T6319A-25AXG | High Efficiency 2X charge Pump |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| T6319A-25AXG | 制造商:TMT 制造商全稱(chēng):TMT 功能描述:High Efficiency 2X charge Pump |
| T6319A-30AXG | 制造商:TMT 制造商全稱(chēng):TMT 功能描述:High Efficiency 2X charge Pump |
| T6319A-40AXG | 制造商:TMT 制造商全稱(chēng):TMT 功能描述:High Efficiency 2X charge Pump |
| T6319A-45AXG | 制造商:TMT 制造商全稱(chēng):TMT 功能描述:High Efficiency 2X charge Pump |
| T6319A-50AXG | 制造商:TMT 制造商全稱(chēng):TMT 功能描述:High Efficiency 2X charge Pump |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。