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PQ60120HZB50NNS Datasheet(PDF) 10 Page - SynQor Worldwide Headquarters |
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PQ60120HZB50NNS Datasheet(HTML) 10 Page - SynQor Worldwide Headquarters |
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10 / 13 page  Input: Input: Output: Output: Current: Current: PPackage: ackage: 35-75 V 35-75 V 12 V 12 V 50 A 50 A (600W) (600W) Half-brick Half-brick T Technical S echnical Specification pecification Product # PQ60120HZA50 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2HZ612J Rev. A 8/20/07 Page 10 To increase the output voltage, the user should connect a resistor between Pin 6 (TRIM) and Pin 7 (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, Rtrim-up and Rtrim-down, showing the total range the output volt- age can be trimmed up or down. Figure B: Trim Graph for 12Vout 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 filtered to eliminate noise. Limited 10% up-trim: This converter is capable of operating for an indefinite period of time with the output trimmed up to 5% above the nominal 12V output level*. It may also be trimmed down by as much as 50% (to 6.0V) indefinitely. This converter is also capable of being trimmed up by as much as 10% (up to 13.2V) for shorter periods of time that are not a sig- nificant fraction of the product lifetime. For example, in a test sit- uation, or for output voltage margining where it would remain trimmed up between 5% and 10% of the nominal voltage for a few hundred hours, but not for an indefinite period or the product lifetime. The OVP trip point is set above this level, so it will not shut down from output overvoltage protection when trimmed up between 5% and 10%. Continuous operation of this converter while trimmed up more than 5% could affect long term reliability. 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 to avoid an input system instability problem, which is described in more detail in the application 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 typ- ical "Turn-On Voltage Threshold" value* 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 con- verter will turn off. Output Current Limit: If the output current exceeds the "Output DC Current Limit Inception" point*, then a fast linear current limit controller will reduce the output voltage to maintain a constant output current. If as a result, the output voltage falls below the "Output DC Current Limit Shutdown Voltage"* for more than 50ms, then the unit will enter into hiccup mode, with a 500ms off-time. The unit will then automatically attempt to restart. Back-Drive Current Limit: If there is negative output current of a magnitude larger than the "Back-Drive Current Limit while Enabled" specification*, then a fast back-drive limit controller will increase the output voltage to maintain a constant output current. If this results in the output voltage exceeding the "Output Over- Voltage Protection" threshold*, then the unit will shut down. The full I-V output characteristics can be seen in Figure 17. Output Over-Voltage Limit: If the voltage directly across the output pins exceeds the "Output Over-Voltage Protection" thresh- old*, the converter will immediately stop switching. This shutdown is latching; unlike other shutdown types, the converter will not restart unless the input power is cycled or the ON/OFF input is toggled. 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 * See Electrical Characteristics page. 0.0 0.1 1.0 10.0 100.0 1,000.0 10,000.0 0 5 10 15 20 25 30 35 40 45 50 % Increase in Vout % Decrease in Vout Rtrim-up kW = Vnominal 1.225 VDES – VNOM x VDES + VNOM – 2 ) ( |
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