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參數(shù)資料
| 型號(hào)： | AAT3193IJQ-4 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 元件分類： | LED驅(qū)動(dòng)器 |
| 英文描述： | Low-Cost, 2-/3-Channel Charge-Pump LED Drivers |
| 中文描述： | 低成本，2-/3-Channel電荷泵LED驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 12/17頁(yè) |
| 文件大小： | 400K |
| 代理商： | AAT3193IJQ-4 |
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AAT3192/93
Low-Cost, 2-/3-Channel
Charge-Pump LED Drivers
12
3193.2007.05.1.0
Table 4: AAT3192/93-4 LED Current Settings
Figure 5: AAT3192/93-4 Current Control Profile
Applications Information
LED Selection
The AAT3192/93 is specifically intended for driving
white LEDs. However, the device design will allow
the AAT3192/93 to drive most types of LEDs with
forward voltage specifications ranging from 2.2V to
4.7V. LED applications may include mixed arrange-
ments for display backlighting, keypad display, and
any other application needing a constant current
sink generated from a varying input voltage. Since
the D1 to D3 constant current sinks are matched
with negligible supply voltage dependence, the
constant current channels will be matched regard-
less of the specific LED forward voltage (V
F
) levels.
The low dropout current sinks in the AAT3192/93
maximize performance and make it capable of driv-
ing LEDs with high forward voltages. Multiple chan-
nels can be combined to obtain a higher LED drive
current without complication.
Constant Current Setting
The LED current is controlled by the R
SET
resistor.
For maximum accuracy, a 1% tolerance resistor is
recommended. Table 5 shows the R
SET
resistor value
for AAT3193-1/2/4 for various LED full-scale current
levels.
Table 5: Maximum LED Current and R
SET
Resistor Values (1% Resistor Tolerance)
for the AAT3193-1/2/4.
Device Switching Noise Performance
The AAT3192/93 operates at a fixed frequency of
approximately 1MHz to control noise and limit har-
monics that can interfere with the RF operation of
mobile communication devices. Back-injected
noise appearing on the input pin of the charge
pump is 20mV peak-to peak, typically ten times
less than inductor-based DC/DC boost converter
white LED backlight solutions. The AAT3192/93
soft-start feature prevents noise transient effects
I
LED
(mA)
30
20
15
10
R
SET
(K)
9.53
14.3
19.1
28.7
EN/PWM Input Pin Duty Cycle (%)
D
0.00
5.00
10.00
15.00
20.00
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
EN/PWM
Duty Cycle
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
D1-D3
Current (mA)
20
17.9
15.9
14
12.1
10.1
8.2
6.3
4.3
2.4
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PDF描述 |
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| AAT3192IJQ-2 | Low-Cost, 2-/3-Channel Charge-Pump LED Drivers |
| AAT3192IJQ-3 | Low-Cost, 2-/3-Channel Charge-Pump LED Drivers |
| AAT3192IJQ-4 | Low-Cost, 2-/3-Channel Charge-Pump LED Drivers |
| AAT3193 | Low-Cost, 2-/3-Channel Charge-Pump LED Drivers |
| AAT3194 | High Efficiency 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 |
|---|---|
| AAT3193IJQ-4-T1 | 制造商:Skyworks Solutions Inc 功能描述:IC LED DRVR BACKLIGHT 10SC70JW 制造商:Skyworks Solutions Inc 功能描述:LED DRIVER IC |
| AAT3194 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:High Efficiency 1.5X Fractional Charge Pump For White LED Applications |
| AAT3194_08 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:High Efficiency 1.5X Fractional Charge Pump For White LED Applications |
| AAT3194ITP-20-T1 | 制造商:Skyworks Solutions Inc 功能描述:LED DRIVER IC |
| AAT3195 | 制造商:AAT 制造商全稱:AAT 功能描述:4-Channel Charge-Pump LED Driver |
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