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  • 參數(shù)資料
    型號(hào): LK1301-7ED7T
    廠商: POWER-ONE INC
    元件分類(lèi): 電源模塊
    英文描述: 1-OUTPUT 150 W AC-DC REG PWR SUPPLY MODULE
    封裝: HEAT SINK, METAL, CASE K02, MODULE
    文件頁(yè)數(shù): 25/26頁(yè)
    文件大?。?/td> 1027K
    代理商: LK1301-7ED7T
    Cassette Style
    AC-DC Converters
    K Series
    Edition 5/5.2000
    8/26
    Thermal Considerations
    If a converter is located in free, quasi-stationary air (con-
    vection cooling) at the indicated maximum ambient tem-
    perature
    TA max (see table: Temperature specifications) and
    is operated at its nominal input voltage and output power,
    the temperature measured at the
    Measuring point of case
    temperature TC (see: Mechanical Data) will approach the
    indicated value
    TC max after the warm-up phase. However,
    the relationship between
    TA and TC depends heavily on the
    conditions of operation and integration into a system. The
    thermal conditions are influenced by input voltage, output
    current, airflow and temperature of surrounding compo-
    nents and surfaces.
    TA max is therefore, contrary to TC max,
    an indicative value only.
    Caution: The installer must ensure that under all operat-
    ing conditions
    TC remains within the limits stated in the
    table:
    Temperature specifications.
    Notes: Sufficient forced cooling or an additional heat sink
    allows
    TA to be higher than 71
    °C (e.g. 85°C) if T
    C max is not
    exceeded.
    For -7 or -9 units at an ambient temperature
    TA of 85°C with
    only convection cooling, the maximum permissible current
    for each output is approx. 40% of its nominal value as per
    figure.
    0
    0.1
    0.2
    0.3
    0.4
    0.5
    0.6
    0.7
    0.8
    50
    60
    70
    80
    90
    100
    Io/Io nom
    TA [°C]
    0.9
    1.0
    Forced cooling
    05089
    TA min
    TC max
    Convection cooling
    Fig. 7
    Output current derating versus temperature for –7 and –9.
    Thermal Protection
    A temperature sensor generates an internal inhibit signal
    which disables the outputs if the case temperature exceeds
    TC max. The outputs are automatically re-enabled if the tem-
    perature drops below this limit.
    It is recommended that continuous operation under simul-
    taneous extreme worst case conditions of the following
    three parameters be avoided: Minimum input voltage,
    maximum output power and maximum temperature.
    Output Protection
    Each output is protected against overvoltage which could
    occur due to a failure of the control circuit by means of a
    voltage suppressor diode which, under worst case condi-
    tions, may become a short circuit. The suppressor diodes
    are not designed to withstand externally applied over-
    voltages. Overload at any of the two outputs will cause a
    shut-down of both outputs. A red LED indicates the over-
    load condition.
    Uo1d
    t d
    Ur
    t
    Uo2d
    <10
    s
    <10
    s
    Uo1
    Uo2
    Io1/Io1 nom
    0
    0.5
    1
    Io2/Io2 nom
    05072
    Fig. 8
    Control deviation of uo1/2 d vs. dynamic load change.
    Output Voltage Regulation of Single or Double Output
    Modules with Outputs1 and 2 Connected in Series
    Uo
    Uo nom
    0.98
    0.5
    0
    0.5
    1.0
    Io1
    IoL
    Io
    Io nom
    05068
    Fig. 9
    Uo1 versus Io1 (typ.) of single output units
    Parallel or Series Connection of Units
    Single or double output units with equal nominal output volt-
    age can be connected in parallel without any precautions
    using option T.
    With option T (current sharing), all units share the current
    approximately equally.
    Single output units and/or main and second outputs of dou-
    ble output units can be connected in series with any other
    (similar) output.
    Note:
    – Parallel connection of double output units should always
    include both, main and second output to maintain good
    regulation of both outputs.
    – Not more than 5 units should be connected in parallel.
    – Series connection of second outputs without involving
    their main outputs should be avoided as regulation may
    be poor.
    – The maximum output current is limited by the output with
    the lowest current limitation if several outputs are con-
    nected in series.
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