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參數(shù)資料
| 型號： | EV0035 |
| 廠商： | Monolithic Power Systems, Inc. |
| 英文描述： | Precision 6-Lamp White LED Driver |
| 中文描述： | 精密6燈白光LED驅(qū)動器 |
| 文件頁數(shù)： | 4/7頁 |
| 文件大?。?/td> | 145K |
| 代理商： | EV0035 |
MP1523 – PRECISION 6-LAMP WHITE LED DRIVER
INITIAL RELEASE
07/04, Rev. 1.6
www.MonolithicPower.com
4
OPERATION
The MP1523 is a step-up converter that
operates from an input voltage as low as 2.7V
and generates an output voltage up to 25V. The
0.5
internal N-Channel power MOSFET is
driven with a variable frequency, constant-peak-
current architecture for low operating current.
The 550ns minimum off time is extended to
1.6μs during start-up to yield a smooth glitch
free turn-on.
Variable Frequency Constant-Peak-Current
Operation
When the power MOSFET is turned on the
inductor current increases until the 0.45A
current limit is reached. The internal power
MOSFET is then turned off for a minimum of
550ns. At the end of this 550ns transition if the
FB pin is still lower than the 400mV threshold
the MOSFET will again be turned on, otherwise
the MP1523 waits until the voltage drops below
the threshold before turning on the MOSFET
again. This process allows for optimal use of
the inductor, while minimizing the output ripple
and size of the output capacitor and maintaining
low operating current.
Open Load Shutdown
Open load shutdown is implemented by
connecting the BIAS pin to the output. In the
fault condition where the connection to the LED
string is open, the output voltage will rise up, as
the FB pin has no voltage. Once the output
voltage exceeds 28V, the MP1523 will cease
operation until the EN pin is cycled off and on.
Connecting the BIAS pin to V
IN
disables open
load shutdown but reduces the chip power
consumption due to the quiescent current.
Figure 1—Functional Block Diagram
ERROR AMP.
CURRENT
+
450mA
CONTROL
LOGIC
INTERNAL
POWER
BIAS
GND
EN
(4)
SW
(1)
FB
(3)
400mV
(2)
(5)
REGULATOR
+
-
Open Load
Shutdown
Comparator
1.23V
160K
17V
20K
+
_
+
7V
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| EV0037 | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:Cold Cathode Fluorescent Lamp Driver |
| EV0041 | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:High Current Integrated Half Bridge + Driver |
| EV0042 | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:1x, 1.5x, 2x High Efficiency Charge Pump 4 White LED Driver |
| EV0043 | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:3A, 25V, 1.1MHz Step-Up Converter |
| EV0045 | 制造商:Monolithic Power Systems 功能描述:STEREO EVALUATION BOARD - Bulk |
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