參數(shù)資料
型號(hào)： MP1518DJE
廠商： MONOLITHIC POWER SYSTEMS INC
元件分類(lèi)： 顯示驅(qū)動(dòng)器
英文描述： Fixed Frequency White LED Driver
中文描述： LED DISPLAY DRIVER, PDSO6
封裝： MO-193AB, TSOT-23, 6 PIN
文件頁(yè)數(shù)： 4/9頁(yè)
文件大?。?/td> 260K
代理商： MP1518DJE
MP1518 – FIXED FREQUENCY WHITE LED DRIVER
MP1518 Rev. 1.6
7/25/2006
www.MonolithicPower.com
4
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
TM
OPERATION
The MP1518 uses a constant frequency, peak
current mode boost regulator architecture to
regulate the series string of white LEDs. The
operation of the MP1518 can be understood by
referring to the block diagram of Figure 1.
At the start of each oscillator cycle the FET is
turned on through the control circuitry. To
prevent sub-harmonic oscillations at duty cycles
greater than 50 percent, a stabilizing ramp is
added to the output of the current sense
amplifier and the result is fed into the positive
input of the PWM comparator. When this
voltage equals the output voltage of the error
amplifier the power FET is turned off.
The voltage at the output of the error amplifier
is an amplified version of the difference
between the 104mV reference voltage and the
feedback voltage. In this way the peak current
level keeps the output in regulation.
If the feedback voltage starts to drop, the output
of the error amplifier increases. This results in
more current flowing through the power FET,
thus increasing the power delivered to the
output.
PWM
COMPARATOR
AMPLIFIER
CONTROL
LOGIC
CURRENT
SENSE
AMPLIFIER
SW
M1
GND
-
+
FB
1.3MHz
OSC
-
+
+
-
+
104mV
Figure 1—Functional Block Diagram
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MP1518DJE-LF-P 制造商:Monolithic Power Systems 功能描述:6 LED, 2.6-6VIN SWITCH DRIVER, BETTER EMI VERSION OF MP1518D - Tape and Reel 制造商:Monolithic Power Systems 功能描述:6 LED, 2.6 - 6Vin Switch Driver
MP1518DJE-LF-Z 制造商:Monolithic Power Systems 功能描述:LED DRVR 6SEGMENT 2.5V TO 6V 6PIN TSOT-23 - Tape and Reel 制造商:Monolithic Power Systems 功能描述:LED DRVR 6SEGMENT 2.5V TO 6V 6PIN TSOT-23 - Cut TR (SOS) 制造商:Monolithic Power Systems 功能描述:6 LED, 2.6 - 6Vin Switch Driver
MP1518DJ-LF-P 功能描述:電源開(kāi)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(kāi)啟電阻（最大值）:85 mOhms 開(kāi)啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)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-LF-Z 功能描述:電源開(kāi)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(kāi)啟電阻（最大值）:85 mOhms 開(kāi)啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)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
MP1519 制造商:MPS 制造商全稱(chēng):Monolithic Power Systems 功能描述:1x, 1.5x, 2x High Efficiency Charge Pump 4 White LED Driver
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