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PQ50050HPB50NNS Datasheet(PDF) 11 Page - SynQor Worldwide Headquarters |
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PQ50050HPB50NNS Datasheet(HTML) 11 Page - SynQor Worldwide Headquarters |
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11 / 14 page  Product # PQ50050HPB50 Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005487 Rev. A 03/18/10 Page 11 Input: Output: Current: Part No.: OUTPUT VOLTAGE TRIM (Pin 7): The TRIM input permits the user to adjust the output voltage across the sense leads up or down according to the trim range specifications.To decrease the output voltage, the user should connect a resistor between Pin 7 and Pin 6 (SENSE(-) input). For a desired decrease of the nominal output voltage, the value of the resistor should be Rtrim-down = (100%) - 2 (kW) D (( where D% = Vnominal – Vdesired x 100% Vnominal To increase the output voltage, the user should connect a resistor between Pin 7 and Pin 8 (SENSE(+) input). For a desired increase of the nominal output voltage, the value of the resistor should be (k W) Rtrim-up = (Vnominal – 2) x VDES + VNOM 1.225 (( VDES - VNOM Figure C graphs the relationship between the trim resistor value and Rtrim-up and Rtrim-down, showing the total range the output voltage can be trimmed up or down. 1 10 100 1,000 10,000 100,000 0 2 4 6 8 10 12 14 16 18 20 % increase Vout % decrease Vout Figure C: Trim Graph Note: the TRIM feature does not affect the voltage at which the out- Note: the TRIM feature does not affect the voltage at which the out- put over-voltage protection circuit is triggered. Trimming the output voltage too high may cause the over-voltage protection circuit to engage, particularly during transients. It is not necessary for the user to add capacitance at the Trim pin. The node is internally bypassed to eliminate noise. Total DC Variation of Vout: For the converter to meet its full specifications, the maximum variation of the DC value of Vout, due to both trimming and remote load voltage drops, should not be greater than that specified for the output voltage trim range. PROTECTION FEATURES Input Under-Voltage Lockout: The converter is designed to turn off when the input voltage is too low, helping avoid an input system instability problem, described in more detail in the applica- tion note titled “Input System Instability” on the SynQor website. The lockout circuitry is a comparator with DC hysteresis. When the input voltage is rising, it must exceed the typical Turn-On Voltage Threshold value (listed on the specification page) before the con- verter will turn on. Once the converter is on, the input voltage must fall below the typical Turn-Off Voltage Threshold value before the converter will turn off. Input Over-Voltage Shutdown: Available on PQ48 models only. The converter turns off when the input voltage is too high, allowing the converter to withstand an input voltage as high as 100V without destruction. The shutdown circuitry is a comparator with DC hysteresis. When the input voltage exceeds the typical Input Over-Voltage Shutdown value, the converter will turn off. Once the converter is off, it will turn back on when the input voltage falls below the minimum Input Over-Voltage Shutdown value. Output Current Limit: The maximum current limit remains con- stant as the output voltage drops. However, once the impedance of the short across the output is small enough to make the output voltage drop below the specified Output DC Current-Limit Shutdown Voltage, the converter turns off. The converter then enters a “hiccup mode” where it repeatedly turns on and off at a 5 Hz (nominal) frequency with a 5% duty cycle until the short circuit condition is removed. This prevents excessive heat- ing of the converter or the load board. Output Over-Voltage Limit: If the voltage across the output pins exceeds the Output Over-Voltage Protection threshold, the converter will immediately stop switching. This prevents damage to the load circuit due to 1) excessive series resistance in output cur- rent path from converter output pins to sense point, 2) a release of a short-circuit condition, or 3) a release of a current limit condition. Load capacitance determines exactly how high the output voltage will rise in response to these conditions. After 200 ms the converter will automatically restart. Over-Temperature Shutdown: A temperature sensor on the converter senses the average temperature of the module. The ther- mal shutdown circuit is designed to turn the converter off when the temperature at the sensed location reaches the Over-Temperature Shutdown value. It will allow the converter to turn on again when the temperature of the sensed location falls by the amount of the Over-Temperature Shutdown Restart Hysteresis value. 1 10 100 1,000 10,000 0 2 4 6 8 10 12 14 16 18 20 % increase Vout % decrease Vout |
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