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    參數(shù)資料
    型號(hào): AAT1149IJS-0.6-T1
    廠商: Advanced Analog Technology,lnc.
    英文描述: 3MHz Fast Transient 400mA Step-Down Converter
    中文描述: 3MHz的快速瞬態(tài)400mA的降壓轉(zhuǎn)換器
    文件頁(yè)數(shù): 14/20頁(yè)
    文件大小: 1800K
    代理商: AAT1149IJS-0.6-T1
    AAT1149
    3MHz Fast Transient
    400mA Step-Down Converter
    14
    1149.2006.11.1.0
    Dissipation due to the RMS current in the ceramic
    output capacitor ESR is typically minimal, resulting in
    less than a few degrees rise in hot-spot temperature.
    Feedback Resistor Selection
    Resistors R1 and R2 of Figure 4 program the output
    to regulate at a voltage higher than 0.6V. To limit the
    bias current required for the external feedback resis-
    tor string while maintaining good noise immunity, the
    minimum suggested value for R2 is 59k
    Ω
    . Although
    a larger value will further reduce quiescent current, it
    will also increase the impedance of the feedback
    node, making it more sensitive to external noise and
    interference. Table 2 summarizes the resistor values
    for various output voltages with R2 set to either 59k
    Ω
    for good noise immunity or 221k
    Ω
    for reduced no
    load input current.
    The AAT1149, combined with an external feedfor-
    ward capacitor (C3 in Figure 4), delivers enhanced
    transient response for extreme pulsed load appli-
    cations. The addition of the feedforward capacitor
    typically requires a larger output capacitor C1 for
    stability.
    Table 2: Feedback Resistor Values.
    R2 = 59k
    Ω
    R1 (k
    Ω
    )
    29.4
    39.2
    49.9
    59.0
    68.1
    78.7
    88.7
    118
    124
    137
    187
    267
    R2 = 221k
    Ω
    R1
    V
    OUT
    (V)
    0.9
    1.0
    1.1
    1.2
    1.3
    1.4
    1.5
    1.8
    1.85
    2.0
    2.5
    3.3
    113K
    150K
    187K
    221K
    261K
    301K
    332K
    442K
    464K
    523K
    715K
    1.00M
    R1 = V
    ·
    R2 = 0.6V
    ·
    59k
    Ω
    = 88.5k
    Ω
    REF
    V
    OUT
    1.5V
    Figure 4: AAT1149 Evaluation Board Schematic.
    L1
    4.7
    μ
    F
    C1
    4.7
    μ
    F
    C2
    V
    OUT
    V
    IN
    GND
    GND
    1
    2
    3
    Enable
    LX
    EN
    1
    OUT
    2
    IN
    3
    LX
    4
    AGND
    5
    PGND
    6
    PGND
    7
    PGND
    8
    AAT1149
    U1
    R1
    59k
    R2
    C3
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    參數(shù)描述
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