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參數(shù)資料
| 型號： | MP1518 |
| 廠商： | Monolithic Power Systems, Inc. |
| 英文描述： | Fixed Frequency White LED Driver |
| 中文描述： | 固定頻率白光LED驅(qū)動器 |
| 文件頁數(shù)： | 5/9頁 |
| 文件大?。?/td> | 260K |
| 代理商： | MP1518 |
MP1518 – FIXED FREQUENCY WHITE LED DRIVER
MP1518 Rev. 1.6
7/25/2006
www.MonolithicPower.com
5
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
TM
APPLICATION INFORMATION
OFF ON
MP1518
V
IN
2.5V to 6V
LED1
LED2
LED3
CMDSH-3
IN
EN
GND
OV
FB
SW
Figure 2—Circuit for Driving 3 WLEDs
A typical application circuit can be seen in
Figure 2. The 3 white LEDs can be driven from
a voltage supply range of 2.5V to 6V at an
output current of 20mA. A 0.22μF output
capacitor is sufficient for most applications but
an output capacitor up to 1μF may be used. A
22μH
inductor
with
resistance)
is
recommended
efficiency.
A
1μF
ceramic
recommended for the input capacitance in the
real system. Schottky diodes have fast recovery
and
a
low
forward
recommended. Schottky diodes rated with
100mA to 200mA are sufficient for the MP1518.
The switching characteristics during normal
operation can be seen in Figure 3. The MP1518
has internal soft-start to limit the amount of
current through VIN at startup and to also limit
the amount of overshoot on the output. The
current limit is increased by a fourth every 40μs
giving a total soft-start time of 120μs.
low
DCR
(Inductor
improve
capacitor
to
is
voltage
and
are
V
SW
5V/div.
V
50mV/div.
I
L
100mA/div.
200ns/div.
Steady State Operation
V
IN
= 3.6V, 3 LEDS, 20mA
Figure 3—Steady State Operation
Figure 4 shows the startup behavior of the
MP1518. The ramped voltage that is added to
the current sense amplifier reduces the current
output as the duty cycle increases. As more
LEDs are added, the output voltage rises but
the current that can be delivered to the load is
reduced as well.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MP1518DG | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:Fixed Frequency White LED Driver |
| MP1518DG-LF-P | 功能描述:LED照明驅(qū)動器 6 LED, 2.6 - 6Vin Switch 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 |
| MP1518DG-LF-Z | 功能描述:電源開關(guān) IC - 配電 6 LED, 2.6 - 6Vin Switch Driver RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| MP1518DJ | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:Fixed Frequency White LED Driver |
| MP1518DJE | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:Fixed Frequency White LED Driver |
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