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    參數(shù)資料
    型號(hào): FS2540-9PD6TB2
    廠商: POWER-ONE INC
    元件分類: 電源模塊
    英文描述: 2-OUTPUT 100 W DC-DC REG PWR SUPPLY MODULE
    封裝: METAL, CASE S02, MODULE
    文件頁(yè)數(shù): 22/33頁(yè)
    文件大?。?/td> 438K
    代理商: FS2540-9PD6TB2
    S Series Data Sheet
    100 Watt AC-DC and DC-DC Converters
    APR 26, 2006 revised to SEP 25, 2006
    Page 29 of 33
    www.power-one.com
    Table 23: Undervoltage monitor functions
    V output
    Monitoring
    Minimum adjustment range
    Typical hysteresis
    Vh [% of Vt]
    (VME compatible)
    of threshold level
    Vt
    for
    Vt min - Vt max
    Vi
    Vo1
    Vti
    Vto
    Vhi
    Vho
    V2
    yes
    no
    Vi min - Vi max
    1
    3.4 - 0.4
    V3
    yes
    Vi min - Vi max
    1
    0.95 - 0.985
    Vo1
    2
    3.4 - 0.4
    "0"
    V0
    yes
    no
    Vi min - Vi max
    3, 4
    3.4 - 0.4
    yes
    Vi min - Vi max
    3, 4
    0.95 - 0.985
    Vo1
    2
    3.4 - 0.4
    "0"
    1 Threshold level adjustable by potentiometer.
    2 Fixed value between 95% and 98.5% of Vo1 (tracking).
    3 Adjusted at Io nom.
    4 Fixed value, resistor-adjusted (±2% at 25 °C) acc. to customer's specifications; individual type number is determined by Power-One.
    Table 22: Available internal input capacitance and factory potentiometer setting of Vti with resulting hold-up time
    Types
    AS
    BS
    FS
    CS
    DS
    ES
    LS
    Unit
    Ci min
    0.83
    0.3
    1.2
    0.66
    0.26
    0.21
    mF
    Vt i
    9.5
    19.5
    39
    61
    97
    120
    VDC
    th
    0.1
    5.3
    1.9
    1.8
    4.3
    6.4
    ms
    Option V: ACFAIL Signal (VME)
    Available only for models with Vo = 5.1 V.
    This option defines an undervoltage monitoring circuit for the
    input and main output voltage. It generates an ACFAIL signal
    (V signal) which conforms to the VME standard.
    The low state level of the ACFAIL signal is specified at a sink
    current of IV ≤ 48 mA to VV ≤ 0.6 V (open-collector output of an
    NPN transistor). The pull-up resistor feeding the open-collector
    output should be placed on the VME backplane.
    After the ACFAIL signal has gone low, the VME standard
    requires a hold-up time (th) of at least 4 ms before the 5.1 V
    output drops to 4.875 V when the output is fully loaded. The
    hold-up time is provided by the internal input capacitance.
    Consequently, the working input voltage and the threshold level
    (Vti) should be adequately above the minimum input voltage
    (Vi min) of the converter so that enough energy is remaining in
    the input capacitance. If the input voltage is below the required
    level, an external hold-up capacitor (Ci ext) should be added.
    Formula for threshold level for desired value of
    th:
    2
    Po (th + 0.3 ms) 100
    Vti =
    ––––––––––––––––––––– +
    Vi min
    2
    Ci min η
    Formula for the external input capacitor:
    2
    Po (th + 0.3 ms) 100
    Ci ext = –––––––––––––––––––––– – Ci min
    η (Vti 2 – Vi min2)
    where as:
    Ci min = internal input capacitance [mF]
    Ci ext = external input capacitance [mF]
    Po
    = output power [W]
    η
    = efficiency [%]
    th
    = hold-up time [ms]
    Vi min = minimum input voltage [V] 1
    Vti
    = threshold level [V]
    1 Min. input voltage according to Electrical Input Data. For output voltages
    Vo > Vo nom, the minimum input voltage increases proportionally to
    Vo/Vo nom.
    Remarks:
    Option V2 and V3 can be adjusted by potentiometer to a threshold
    level between Vi min and Vi max. A decoupling diode should be
    connected in series with the input of AS - FS converters to avoid
    the input capacitance discharging through other loads connected
    to the same source voltage.
    Vt + Vh. The threshold level Vti is either adjustable by
    potentiometer, accessible through a hole in the front cover,
    or adjusted during manufacture to a determined customer
    specified value.
    Versions V0, V2, and V3 are available as shown below.
    Option V operates independently of the built-in input
    undervoltage lockout circuit. A logic "low" signal is generated at
    pin 20 as soon as one of the monitored voltages drops below the
    preselected threshold level
    Vt. The return for this signal is Vo1–.
    The V output recovers when the monitored voltage(s) exceed(s)
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