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參數(shù)資料
| 型號(hào)： | LM3224MM-ADJ |
| 廠(chǎng)商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | 615kHz/1.25MHz Step-up PWM DC/DC Converter |
| 中文描述： | 2.8 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁(yè)數(shù)： | 3/18頁(yè) |
| 文件大小： | 920K |
| 代理商： | LM3224MM-ADJ |
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Block Diagram
20097603
General Description
The LM3224 utilizes a PWM control scheme to regulate the
output voltage over all load conditions. The operation can
best be understood referring to the block diagram and
Figure
1
of the
Operation
section. At the start of each cycle, the
oscillator sets the driver logic and turns on the NMOS power
device conducting current through the inductor, cycle 1 of
Figure 1
(a). During this cycle, the voltage at the V
C
pin
controls the peak inductor current. The V
C
voltage will in-
crease with larger loads and decrease with smaller. This
voltage is compared with the summation of the SW voltage
and the ramp compensation. The ramp compensation is
used in PWM architectures to eliminate the sub-harmonic
oscillations that occur during duty cycles greater than 50%.
Once the summation of the ramp compensation and switch
voltage equals the V
voltage, the PWM comparator resets
the driver logic turning off the NMOS power device. The
inductor current then flows through the schottky diode to the
load and output capacitor, cycle 2 of
Figure 1
(b). The NMOS
power device is then set by the oscillator at the end of the
period and current flows through the NMOS power device
once again.
The LM3224 has dedicated protection circuitry running dur-
ing normal operation to protect the IC. The Thermal Shut-
down circuitry turns off the NMOS power device when the
die temperature reaches excessive levels. The UVP com-
parator protects the NMOS power device during supply
power startup and shutdown to prevent operation at voltages
less than the minimum input voltage. The OVP comparator is
used to prevent the output voltage from rising at no loads
allowing full PWM operation over all load conditions. The
LM3224 also features a shutdown mode decreasing the
supply current to 0.1μA (typ.).
L
www.national.com
3
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3224MM-ADJ/NOPB | 功能描述:DC/DC 開(kāi)關(guān)控制器 STEP-UP PWM DC/DC CONVERTER RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| LM3224MM-ADJEV | 功能描述:電源管理IC開(kāi)發(fā)工具 LM3224 EVAL BOARD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類(lèi)型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| LM3224MM-ADJEV/NOPB | 功能描述:電源管理IC開(kāi)發(fā)工具 LM3224 EVAL BOARD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類(lèi)型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| LM3224MMX-ADJ | 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:615kHz/1.25MHz Step-up PWM DC/DC Converter |
| LM3224MMX-ADJ/NOPB | 功能描述:DC/DC 開(kāi)關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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