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PQ60500HZX12 Datasheet(PDF) 11 Page - SynQor Worldwide Headquarters |
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PQ60500HZX12 Datasheet(HTML) 11 Page - SynQor Worldwide Headquarters |
11 / 16 page Input: 35-75V Output: 50V Current: 12A Package: Half-brick Product # PQ60500HZx12 Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005982 Rev. D 03/04/14 Page 11 Input: 35-75V Output: 50V Current: 12A Package: Half-brick Applications Section 0.0 0.1 1.0 10.0 100.0 1,000.0 10,000.0 100,000.0 0 5 10 15 20 25 30 35 40 45 50 % increase Vout % decrease Vout Figure C: Trim Graph The Trim Graph in Figure C shows 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. 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 circuit 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. 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 (UVLO): 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. When the input is rising, it must exceed the typical “Turn-On Voltage Threshold”* before the converter will turn on. Once the converter is on, the input must fall below the typical "Turn-Off Voltage Threshold"* before the converter will turn off. Output Current Limit (OCP): If the output current exceeds the “Output DC Current Limit Inception” value*, 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 50 ms, then the unit will enter into hiccup mode, with a 500 ms 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. Output Over-Voltage Limit (OVP): 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 current 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 500 ms the converter will automatically restart for all but the S Feature Set option, which is latching and will not restart until input power is cycled or the ON/OFF input is toggled. During an output over-voltage condition, the converter's LED will illuminate. For units with latching OVP (S Feature Set), once the over-voltage condition has been removed the LED will flash steadily until the input power or the ON/OFF input is toggled. Over-Temperature Shutdown (OTP): A thermister 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”*. Startup Inhibit Period: The Startup Inhibit Period ensures that the converter will remain off for approximately 500 ms when it is shut down due to a fault. This generates a 2 Hz “hiccup mode,” preventing the converter from overheating. There are multiple ways the converter can be shut down, initiating a Startup Inhibit Period: • Output Over-Voltage Protection • Current Limit • Short Circuit Protection * See Electrical Characteristics section. |
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