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參數(shù)資料
| 型號(hào)： | AAT3119IJS-4.5-T1 |
| 廠商： | Advanced Analog Technology,lnc. |
| 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)： | 13/18頁(yè) |
| 文件大?。?/td> | 529K |
| 代理商： | AAT3119IJS-4.5-T1 |
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Flash LED Driver
The AAT3119 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 products.
Typically the 4.5V output version of the AAT3119
should be selected for photo-flash LED applica-
tions, as it can maintain better voltage regulation at
higher pulsed load current levels (refer to Figure 2).
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 AAT3119
5.0V output option. However, the maximum cur-
rent 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 resis-
tor. 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 follow-
ing equation:
Where:
R
F
V
OUT
=
= Flash ballast resistor value in ohms (
Ω
)
Regulated charge pump output voltage
(typically 4.5V)
V
F
= Flash LED forward voltage at the
desired forward current
I
F
The flash LED function can be controlled by the
AAT3119 enable pin in most applications. The
device start-up time into a maximum load is about
200
μ
s, thus eliminating the need for pre-flash con-
trol synchronization.
= Desired flash LED forward current
R
F
= (V
OUT
- V
F
)
I
F
AAT3119
High Efficiency 2X Charge Pump
3119.2007.02.1.2
13
Figure 1: White LED Driver.
AAT3119
IN
GND
EN
OUT
C
OUT
1
μ
F
C
IN
1
μ
F
1
F
C1+
C1-
D1
D2
D3
D4
D5
D6
C
FLY
R
B2
R
B3
R
B4
R
B5
R
B1
R
B6
V
BATTERY
Enable
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AAT3119IJS-5.0-T1 | High Efficiency 2X Charge Pump |
| AAT3120 | 3-Channel Charge Pump For White LED Applications |
| AAT3120ITP-T1 | 3-Channel Charge Pump For White LED Applications |
| AAT3123A | High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications |
| AAT3123AITP-20-T1 | High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT3119IJS-5.0-T1 | 制造商:Advanced Analogic Tech 功能描述:AAT3119 Series 1.2MHz 150mA Step up High Efficiency 2X Charge Pump-SC70JW - 8 制造商:SKYWORKS SOLUTIONS 功能描述:AAT3119 Series 1.2MHz 150mA Step up High Efficiency 2X Charge Pump-SC70JW - 8 制造商:Skyworks Solutions Inc 功能描述:LED DRIVER IC |
| AAT3120 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:3-Channel Charge Pump For White LED Applications |
| AAT3120ITP-T1 | 制造商:Skyworks Solutions Inc 功能描述:LED DRIVER IC |
| AAT3122 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications |
| AAT3122_05 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications |
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