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參數(shù)資料
| 型號： | MP1528 |
| 廠商： | Monolithic Power Systems, Inc. |
| 英文描述： | 9 Lamp, 36V Precision White LED Driver |
| 中文描述： | 9燈，36V的精密白光LED驅(qū)動器 |
| 文件頁數(shù)： | 7/9頁 |
| 文件大小： | 249K |
| 代理商： | MP1528 |
MP1528 – 9 LAMP, 36V PRECISION WHITE LED DRIVER
MP1528 Rev. 1.7
2/21/2006
www.MonolithicPower.com
7
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
TM
APPLICATION INFORMATION
Setting the LED Current
The LED current is set by the voltage at BRT
(V
BRT
) and the sense resistor (R1) at FB. The
V
BRT
range for adjusting the LED current is
0.27V to 1.2V. Over this range, the LED current
can be calculated as:
1
R
3
V
I
BRT
×
LED
=
Voltages greater than 1.2V can be applied to
BRT. Use 1.2V in the equation if V
BRT
≥
1.2V or
the BRT pin is left open.
For example, the LED current is set to 20mA if
V
BRT
≥
1.2V (or left open) and R1 = 20
.
Capacitor Selection
A 4.7μF to 10μF ceramic input capacitor (C1)
and a 0.47μF to 1μF ceramic output capacitor
(C2) are recommended for most applications. A
capacitor (C3, typically 1nF to 10nF) in parallel
with the LED string improves stability, input
ripple and output ripple, especially when large
inductance values (10μH or above) are used.
For the best stability over a wide temperature
range, use capacitors with a X5R or X7R
dielectric.
Inductor Selection
The MP1528 has a 950mA inductor current limit
and can drive up to 9 LEDs at 20mA.
Inductance values (for L1) from 4.7μH to 22μH
will work as well. 6.2μH or 6.8μH is a good
choice for high efficiency and small size. To
prevent saturation, use an inductor with a
saturation current rating that is higher than the
device current limit.
Diode Selection
The MP1528’s
demands a high speed rectifier (D1) for
optimum efficiency. A Schottky diode is
recommended due to its fast recovery time and
low forward voltage drop. Ensure the diode’s
average and peak current ratings exceed the
average output current and peak inductor
current. In addition, the diode’s reverse
breakdown voltage must exceed the output
voltage.
high
switching
frequency
Layout
Careful PC board layout is required due to fast
switching. All components must be placed as
close to the IC as possible. Keep the path
between the inductor L1, diode D1, and output
capacitor C2 extremely short for minimal noise
and ringing. The feedback components such as
the sense resistor R1 must be kept close to the
FB pin to prevent noise injection on the FB pin
trace. The ground return of C1 and C2 should
be tied close to the GND pin. See the MP1528
demo board layout for reference.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MP1528DK | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:9 Lamp, 36V Precision White LED Driver |
| MP1528DK-LF-P | 功能描述:LED照明驅(qū)動器 6 LED, 2.5 - 36Vin 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 |
| MP1528DK-LF-Z | 功能描述:LED照明驅(qū)動器 6 LED, 2.5 - 36Vin 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 |
| MP1528DQ | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:9 Lamp, 36V Precision White LED Driver |
| MP1528DQ-LF-P | 功能描述:LED照明驅(qū)動器 6 LED, 2.5 - 36Vin 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 |
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