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參數(shù)資料

型號(hào)：	LM2599S-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 3A Step-Down Voltage Regulator, with Features
中文描述：	7.5 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, PSSO7
封裝：	TO-263, 7 PIN
文件頁數(shù)：	26/31頁
文件大小：	812K
代理商：	LM2599S-3.3

Application Information

(Continued)

lNVERTING REGULATOR

The circuit in Figure 26 converts a positive input voltage to a

negative output voltage with a common ground. The circuit

operates by bootstrapping the regulator’s 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 LM2599-5 to generate a 5V output,

but other output voltages are possible by selecting other out-

put 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 maxi-

mum output current greatly depends on both the input and

output voltage. The curve shown in Figure 27 provides 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 con-

verting +20V to 5V, the regulator would see 25V between

the input pin and ground pin. The LM2599 has a maximum

input voltage rating of 40V.

DS012582-42

FIGURE 25. Typical Circuit Using Shutdown /Soft-start and Error Flag Features

DS012582-43

FIGURE 26. Inverting 5V Regulator With Shutdown and Soft-start

www.national.com

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相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
LM2599S-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
LM2599S-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
LM2599S-5.0P+	制造商:Texas Instruments 功能描述:7.5 A SWITCHING REGULATOR, 173 KHZ SWITCHING FREQ-MAX, PSSO7, TO-263, 7 PIN
LM2599SADJ	制造商:National Semiconductor 功能描述:Conv DC-DC Single Step Down 4.5V to 40V 8-Pin(7+Tab) TO-263 T/R
LM2599S-ADJ	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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