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參數(shù)資料
| 型號： | LM2733YMFX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.6/1.6 MHz Boost Converters With 40V Internal FET |
| 中文描述： | 1.5 A SWITCHING REGULATOR, 800 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數(shù)： | 3/13頁 |
| 文件大?。?/td> | 507K |
| 代理商： | LM2733YMFX |
Block Diagram
20055403
Theory of Operation
The LM2733 is a switching converter IC that operates at a
fixed frequency (0.6 or 1.6 MHz) using current-mode control
for fast transient response over a wide input voltage range
and incorporate pulse-by-pulse current limiting protection.
Because this is current mode control, a 50 m
sense resis-
tor in series with the switch FET is used to provide a voltage
(which is proportional to the FET current) to both the input of
the pulse width modulation (PWM) comparator and the cur-
rent limit amplifier.
At the beginning of each cycle, the S-R latch turns on the
FET. As the current through the FET increases, a voltage
(proportional to this current) is summed with the ramp com-
ing from the ramp generator and then fed into the input of the
PWM comparator. When this voltage exceeds the voltage on
the other input (coming from the Gm amplifier), the latch
resets and turns the FET off. Since the signal coming from
the Gm amplifier is derived from the feedback (which
samples the voltage at the output), the action of the PWM
comparator constantly sets the correct peak current through
the FET to keep the output volatge in regulation.
Q1 and Q2 along with R3 - R6 form a bandgap voltage
reference used by the IC to hold the output in regulation. The
currents flowing through Q1 and Q2 will be equal, and the
feedback loop will adjust the regulated output to maintain
this. Because of this, the regulated output is always main-
tained at a voltage level equal to the voltage at the FB node
"multiplied up" by the ratio of the output resistive divider.
The current limit comparator feeds directly into the flip-flop,
that drives the switch FET. If the FET current reaches the
limit threshold, the FET is turned off and the cycle terminated
until the next clock pulse. The current limit input terminates
the pulse regardless of the status of the output of the PWM
comparator.
L
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| LM2733XMF | 0.6/1.6 MHz Boost Converters With 40V Internal FET |
| LM2733 | 0.6/1.6 MHz Boost Converters With 40V Internal FET |
| LM2734YMKX | Thin SOT23 1A Load Step-Down DC-DC Regulator |
| LM2734YMK | Thin SOT23 1A Load Step-Down DC-DC Regulator |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2733YMFX/NOPB | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(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 |
| LM2733YMFX-NOPB | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LM2733 0.6/1.6 MHz Boost Converters With 40V Internal FET Switch in SOT-23 |
| LM2734 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Thin SOT23 1A Load Step-Down DC-DC Regulator |
| LM27341 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regulator with Frequency Synchronization |
| LM27341_10 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regulator with Frequency Synchronization |
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