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參數(shù)資料
| 型號： | LM25010MHX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 42V, 1.0A Step-Down Switching Regulator |
| 中文描述： | 1.5 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封裝： | PLASTIC, TSSOP-14 |
| 文件頁數(shù)： | 8/17頁 |
| 文件大?。?/td> | 776K |
| 代理商： | LM25010MHX |
Functional Description
The LM25010 Step-Down Switching Regulator features all
the functions needed to implement a low cost, efficient buck
DC-DC converter capable of supplying in excess of 1Ato the
load. This high voltage regulator integrates an N-Channel
buck switch, with an easy to implement constant on-time
controller. It is available in the thermally enhanced LLP-10
and TSSOP-14EP packages. The regulator compares the
feedback voltage to a 2.5V reference to control the buck
switch, and provides a switch on-time which varies inversely
with VIN. This feature results in the operating frequency
remaining relatively constant with load and input voltage
variations. The switching frequency can range from less than
100 kHz to 1.0 MHz. The regulator requires no loop com-
pensation resulting in very fast load transient response. The
valley current limit circuit holds the buck switch off until the
free-wheeling inductor current falls below the current limit
threshold, nominally set at 1.25A.
The LM25010 can be applied in numerous applications to
efficiently step-down higher DC voltages. Features include:
Thermal shutdown, VCC under-voltage lock-out, gate drive
under-voltage lock-out, and maximum duty cycle limit.
Control Circuit Overview
The LM25010 employs a control scheme based on a com-
parator and a one-shot on-timer, with the output voltage
feedback (FB) compared to an internal reference (2.5V). If
the FB voltage is below the reference the buck switch is
turned on for a time period determined by the input voltage
and a programming resistor (R
ON
). Following the on-time the
switch remains off for a fixed 260 ns off-time, or until the FB
voltage falls below the reference, whichever is longer. The
buck switch then turns on for another on-time period. Refer-
ring to the Block Diagram, the output voltage is set by R1
and R2. The regulated output voltage is calculated as fol-
lows:
V
OUT
= 2.5V x (R1 + R2) / R2
(1)
20172711
FIGURE 1. Startup Sequence
L
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM25010MHX/NOPB | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| LM25010Q0MH | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| LM25010Q0MH/NOPB | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| LM25010Q0MHX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:42V, 1.0A Step-Down Switching Regulator |
| LM25010Q0MHX/NOPB | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
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