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MPFC-115-270-QP Datasheet(PDF) 9 Page - SynQor Worldwide Headquarters |
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MPFC-115-270-QP Datasheet(HTML) 9 Page - SynQor Worldwide Headquarters |
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9 / 16 page  MPFC-115-270-QP Input:85-180Vrms Output:270Vdc Power:350W Product # MPFC-115-270-QP Phone 1-888-567-9596 www.synqor.com Doc.# 005-0006727 Rev. B 03/31/2016 Page 9 Brownout/Dropout Sequence If the AC source voltage is present but it is below its continuous minimum input voltage limit, the MPFCQor will still draw whatever power it can (within its current limits) from the AC source. This power may not be enough for the total load power, in which case the hold-up capacitor will provide the balance of the power. The voltage across the hold-up capacitor will therefore drop as it discharges. If the AC source voltage drops below its specified transient minimum input voltage limit, the MPFCQor’s boost converter will shut down and no longer deliver power to the output. Under this condition, all of the load power will be drawn from the hold- up capacitor. If and when the voltage across the hold-up capacitor drops below its specified minimum limit, the LOAD_ENABLE output will be de-asserted to a logic high. Besides disabling the load converters, this condition will cause the MPFCQor to return to the beginning of the startup sequence described above. NOTE: Regardless of what happens to the MPFCQor’s output voltage under a brownout or dropout condition, if the AC source voltage drops below its rated under-voltage value for 1 second or more, the MPFCQor will shut down. If, however, the voltage across the hold-up capacitor does not drop below its specified minimum limit before the AC source voltage returns to within its continuous operating range (and it hasn’t been absent for more than 1 second), the MPFCQor will automatically re-establish its power flow. The hold-up capacitor will be recharged immediately to the peak of the AC source voltage (if it has fallen below this value) and to its nominal regulated voltage level within a few cycles of the AC source waveform. NOTE: During the first phase where the hold-up capacitor is recharged (if this phase exists) there will be an inrush current drawn from the AC source that depends on the details of how quickly the AC source voltage returns to its normal operating condition. Control Features Auxiliary Power Supply (AUX) (Pin 5): The circuit shown below is an effective model for the AUX bias power supply: The purpose of the AUX power supply is to provide a low level of power to control circuitry at the output of the MPFCQor, such as the circuits shown earlier in this section. The AUX power supply is present and regulated whenever the MPFCQor’s output voltage is greater than approximately 75V. The AUX bias power supply is unspecified when MPFCQor’s output voltage is less than about 75V (it may, for instance, come and go as the output voltage rises on its way to 75V). PFC_ENABLE (Pin 2): The MPFCQor uses the following circuit for this input logic signal: • If this input is floating or tied high the MPFCQor’s boost converter is disabled and the LOAD_ENABLE output signal is de-asserted high. • If this input is pulled low the MPFCQor’s boost is enabled after the pre-charger has charged the voltage across the hold-up capacitor to within approximately 10 volts of the peak of the AC source voltage. Application Section |
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