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參數(shù)資料
| 型號(hào)： | LM2597M-3.3 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SIMPLE SWITCHER Power Converter 150 kHz 0.5A Step-Down Voltage Regulator, with Features |
| 中文描述： | 1.4 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | PLASTIC, SOIC-8 |
| 文件頁數(shù)： | 29/34頁 |
| 文件大?。?/td> | 900K |
| 代理商： | LM2597M-3.3 |
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Application Information
(Continued)
lNVERTING REGULATOR
The circuit in Figure 29 converts a positive input voltage to a
negative output voltage with a common ground. The circuit
operates by bootstrapping the regulators ground pin to the
negative output voltage, then grounding the feedback pin,
the regulator senses the inverted output voltage and regu-
lates it.
This example uses the LM2597-5 to generate a 5V output,
but other output voltages are possible by selecting other
output voltage versions, including the adjustable version.
Since this regulator topology can produce an output voltage
that is either greater than or less than the input voltage, the
maximum output current greatly depends on both the input
and output voltage. The curve shown in Figure 30provides a
guide as to the amount of output load current possible for the
different input and output voltage conditions.
The maximum voltage appearing across the regulator is the
absolute sum of the input and output voltage, and this must
be limited to a maximum of 40V. In this example, when
converting +20V to 5V, the regulator would see 25V be-
tween the input pin and ground pin. The LM2597 has a
maximum input voltage rating of 40V (60V for the
LM2597HV).
DS012440-47
FIGURE 28. Typical Circuit Using Shutdown /Soft-start and Error Flag Features
DS012440-48
FIGURE 29. Inverting 5V Regulator With Shutdown and Soft-start
L
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| LM2597M-12 | SIMPLE SWITCHER Power Converter 150 kHz 0.5A Step-Down Voltage Regulator, with Features |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2597M33 | 制造商:Texas Instruments 功能描述:SWITCHING REG 0.5A 3.3V SMD 2597 |
| LM2597M-5.0 | 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 |
| LM2597M-5.0/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 |
| LM2597M50 | 制造商:NATIONAL 功能描述:New |
| LM2597M50 | 制造商:Texas Instruments 功能描述:SWITCHING REG 0.5A 5.0V SMD 2597 |
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