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PQ55530HEB08PRA Datasheet(PDF) 11 Page - SynQor Worldwide Headquarters |
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PQ55530HEB08PRA Datasheet(HTML) 11 Page - SynQor Worldwide Headquarters |
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11 / 14 page  Product # PQ55530HEB08 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2HEB53P Rev. B 10/4/07 Page 11 T Technical S echnical Specification pecification Input: Input: Output: Output: Current: Current: PPackage: ackage: 38-55 V 38-55 V 53 V 53 V 7.6 A 7.6 A Half-brick Half-brick 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 Figure B 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. Figure B: Trim Graph for 53Vout module Note: the TRIM feature does not affect the voltage at which the output over-voltage protection circuit is triggered. Trimming the output voltage too high may cause the over-voltage protection cir- cuit 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 appli- cation note titled “Input System Instability”. The lockout circuitry is a comparator with DC hysteresis. When the input voltage is ris- ing, it must exceed the typical Turn-On Voltage Threshold value (listed on the specification page) before the converter 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. Output Current Limit: If the load current is increased to the current limit threshold, the current will be limited at that value, and the output voltage will decrease as the load resistance is low- ered. When the load current is decreased below the current limit point, the voltage will recover to the normal, regulated level. Note: If the unit is held in overcurrent and the load is suddenly reduced to zero, an output voltage overshoot can occur and pos- sibly trip the overvoltage protection. Output Over-Voltage Protection: If the voltage across the output pins exceeds the Output Over-Voltage Protection threshold, the converter will immediately shut down and latch off. To reset this latched fault condition, either the ON/OFF pin must be tog- gled from on to off and back on again or the input power must be removed and re-applied. Over-Temperature Shutdown: A temperature sensor on the converter senses the average temperature of the module. The thermal 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. (k W) Rtrim-up = ( Vnominal – 2) x VDES + VNOM 1.225 VDES - VNOM 1 10 100 1,000 10,000 100,000 0 2 4 6 8 10 12 14 16 18 20 % Increase in Vout % Decrease in Vout |
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