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    參數(shù)資料
    型號(hào): LT1071
    廠商: Linear Technology Corporation
    元件分類: 基準(zhǔn)電壓源/電流源
    英文描述: 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C
    中文描述: 射頻放大器
    文件頁(yè)數(shù): 6/12頁(yè)
    文件大?。?/td> 265K
    代理商: LT1071
    6
    LT1070/LT1071
    TYPICAL PERFOR
    M
    A
    CE CHARACTERISTICS
    U
    voltage is obtained by using the output of a voltage
    sensing error amplifier to set current trip level. This
    technique has several advantages. First, it has immediate
    response to input voltage variations, unlike ordinary
    switchers which have notoriously poor line transient
    response. Second, it reduces the 90
    °
    phase shift at
    The LT1070/LT1071 is a current mode switcher. This
    means that switch duty cycle is directly controlled by
    switch current rather than by output voltage. Referring to
    the Block Diagram, the switch is turned “on” at the start
    of each oscillator cycle. It is turned “off” when switch
    current reaches a predetermined level. Control of output
    OPERATIO
    U
    Switch “Off” Characteristics
    SWITCH VOLTAGE (V)
    0
    S
    μ
    A
    600
    800
    1000
    80
    1070/71 G19
    400
    200
    500
    700
    900
    300
    100
    0
    20
    40
    60
    10
    90
    30
    50
    70
    100
    V
    SUPPLY
    =
    3V
    15V
    40V
    55V
    FREQUENCY (Hz)
    1000
    T
    μ
    m
    P
    °
    )
    3000
    4000
    6000
    7000
    1k
    100k
    1M
    10M
    1070/71 G21
    –1000
    10k
    5000
    2000
    0
    150
    90
    θ
    60
    0
    –30
    210
    30
    120
    180
    g
    m
    Transconductance of Error
    Amplifier
    V
    C
    Pin Characteristics
    V
    C
    PIN VOLTAGE (V)
    0
    –400
    V
    C
    μ
    A
    –300
    –200
    –100
    300
    100
    0.5
    1.0
    200
    0
    1.5
    2.0
    2.5
    1070/71 G20
    V
    = 1.5V
    (CURRENT INTO
    V
    C
    PIN)
    V
    = 0.8V
    (CURRENT OUT OF V
    C
    PIN)
    T
    J
    = 25
    °
    C
    BLOCK DIAGRA
    M
    W
    +
    +
    ERROR
    AMP
    CURRENT
    AMP
    0.02
    (0.04
    LT1071)
    SHUTDOWN
    CIRCUIT
    MODE
    SELECT
    40kHz
    OSC
    LOGIC
    DRIVER
    ANTISAT
    16V
    5A, 75V
    SWITCH
    V
    IN
    FB
    V
    C
    COMP
    GAIN
    6
    0.15V
    1070/71 BD
    1.24V
    REF
    2.3V
    REG
    FLYBACK
    ERROR
    AMP
    SWITCH
    OUT
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