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參數(shù)資料
| 型號(hào)： | 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(dòng)器 |
| 文件頁(yè)數(shù)： | 6/9頁(yè) |
| 文件大?。?/td> | 249K |
| 代理商： | MP1528 |
MP1528 – 9 LAMP, 36V PRECISION WHITE LED DRIVER
MP1528 Rev. 1.7
2/21/2006
www.MonolithicPower.com
6
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
TM
OPERATION
INTERNAL
REGULATOR
& ENABLE
CIRCUIT
UVLO &
THERMAL
SHUTDOWN
330ns
ONE-SHOT
TIMER
FEEDBACK
COMPARATOR
OPEN LOAD
SHUTDOWN
COMPARATOR
CURRENT LIMIT
COMPARATOR
CONTROL
LOGIC &
OUTPUT
DRIVER
--
+
1.2V
FB
MP1528_F01_BD01
GND
SW
0.6V
1.23V
29V
--
+
-
+
--
+
--
+
BIAS
EN
BRT
1
2
3
4
5
6
Figure 1—Functional Block Diagram
The MP1528 utilizes a constant off-time control
scheme. For maximum brightness, the BRT pin
is biased at or above 1.2V. Its voltage is routed
through the unity gain buffer whose output is
clamped at 1.2V. A resistor divider from the
buffer to the inverting input of the feedback
comparator divides the BRT voltage by three to
set the current sense threshold. If the FB pin
voltage is lower than this threshold the power
MOSFET is turned on. The MOSFET and
inductor currents increase until the current limit
comparator trips at 950mA, turning off the
MOSFET for at least 330ns. At the end of the
330ns, if the FB pin is still lower than the
current sense threshold, the MOSFET is turned
on again.
Analog Brightness Adjust
Analog
brightness
accomplished by applying a voltage between
0.27V to 1.2V on the BRT pin.
adjustments
are
PWM Brightness Adjust
PWM brightness adjustments are accomplished
by driving the BRT pin with a digital signal
whose low voltage is below 0.18V and high
voltage is greater than 1.2V. A voltage below
0.18V forces the power MOSFET to turn off. A
voltage greater than 1.2V will cause the FB pin
to regulate at 0.4V.
Open Load Shutdown
Open Load Shutdown is implemented by
connecting the BIAS pin to the top of the LED
string. In the fault condition where the
connection to the LED is open, V
OUT
will rise up,
as the FB pin has no voltage. Once V
OUT
exceeds 40V, the MP1528 will cease operation
until the EN pin is cycled off and on. Connecting
the BIAS pin to the input will disable Open Load
Shutdown.
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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(dòng)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(dòng)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(dòng)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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