•
    參數(shù)資料
    型號(hào)： LM2597-ADJMDC
    廠商： NATIONAL SEMICONDUCTOR CORP
    元件分類： 穩(wěn)壓器
    英文描述： 1.4 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, UUC
    封裝： DIE
    文件頁數(shù)： 5/40頁
    文件大?。?/td> 1019K
    代理商： LM2597-ADJMDC
    LM2597/LM2597HV Series Buck Regulator Design Procedure (Adjustable
    Output) (Continued)
    PROCEDURE (Adjustable Output Voltage Version)
    EXAMPLE (Adjustable Output Voltage Version)
    3. Output Capacitor Selection (C
    OUT)
    A. In the majority of applications, low ESR electrolytic or solid
    tantalum capacitors between 82 F and 220 F provide the
    best results. This capacitor should be located close to the IC
    using short capacitor leads and short copper traces. Do not
    use capacitors larger than 220 F. For additional informa-
    tion, see section on output capacitors in application in-
    formation section.
    B. To simplify the capacitor selection procedure, refer to the
    quick design table shown in
    Figure 2. This table contains
    different output voltages, and lists various output capacitors
    that will provide the best design solutions.
    C. The capacitor voltage rating should be at least 1.5 times
    greater than the output voltage, and often much higher volt-
    age ratings are needed to satisfy the low ESR requirements
    needed for low output ripple voltage.
    3. Output Capacitor SeIection (C
    OUT)
    A. See section on C
    OUT in Application Information section.
    B. From the quick design table shown in
    Figure 2, locate the
    output voltage column. From that column, locate the output
    voltage closest to the output voltage in your application. In this
    example, select the 24V line. Under the output capacitor
    section, select a capacitor from the list of through hole elec-
    trolytic or surface mount tantalum types from four different
    capacitor manufacturers. It is recommended that both the
    manufacturers and the manufacturers series that are listed in
    the table be used.
    In this example, through hole aluminum electrolytic capacitors
    from several different manufacturers are available.
    82 F
    50V
    Panasonic HFQ Series
    120 F
    50V
    Nichicon PL Series
    C. For a 20V output, a capacitor rating of at least 30V or more
    is needed. In this example, either a 35V or 50V capacitor
    would work. A 50V rating was chosen because it has a lower
    ESR which provides a lower output ripple voltage.
    Other manufacturers or other types of capacitors may also be
    used, provided the capacitor specifications (especially the
    100 kHz ESR) closely match the types listed in the table.
    Refer to the capacitor manufacturers data sheet for this infor-
    mation.
    4. Feedforward Capacitor (C
    FF) (See Figure 12)
    For output voltages greater than approximately 10V, an addi-
    tional capacitor is required. The compensation capacitor is
    typically between 50 pF and 10 nF, and is wired in parallel with
    the output voltage setting resistor, R
    2. It provides additional
    stability for high output voltages, low input-output voltages,
    and/or very low ESR output capacitors, such as solid tantalum
    capacitors.
    This capacitor type can be ceramic, plastic, silver mica, etc.
    (Because of the unstable characteristics of ceramic capacitors
    made with Z5U material, they are not recommended.)
    4. Feedforward Capacitor (C
    FF)
    The table shown in
    Figure 2 contains feed forward capacitor
    values for various output voltages. In this example,a1nF
    capacitor is needed.
    LM2597/LM2597HV
    www.national.com
    13
    相關(guān)PDF資料
    PDF描述
    LM2597HV-5MDC 1.4 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, UUC
    LM2597-3.3MWA 1.4 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, UUC
    LM2597HV-5MWC 1.4 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, UUC
    LM2597-5.0MDA 1.4 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, UUC
    LM2597-5.0MWA 1.4 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, UUC
    相關(guān)代理商/技術(shù)參數(shù)
    參數(shù)描述
    LM2597HVM-12 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
    LM2597HVM-12/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
    LM2597HVM-12/NOPB 制造商:Texas Instruments 功能描述:DC/DC Converter IC
    LM2597HVM-3.3 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
    LM2597HVM-3.3/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
    發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

    采購需求

    (若只采購一條型號(hào)，填寫一行即可)

    發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

    發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

    *型號(hào) *數(shù)量 廠商 批號(hào) 封裝
    添加更多采購

    我的聯(lián)系方式

    *
    *
    *