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PQ60120QGA08NKS Datasheet(PDF) 10 Page - SynQor Worldwide Headquarters |
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PQ60120QGA08NKS Datasheet(HTML) 10 Page - SynQor Worldwide Headquarters |
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10 / 13 page  Product # PQ60120QGA08 Phone 1-888-567-9596 Doc.# 005-2QG612D Rev. A 1/23/03 Page 10 Technical Specification 48Vin 12Vout 8.3A Quarter Quarter Brick Brick Note: the output over-voltage protection circuit senses the volt- age across the output (pins 8 and 4) to determine when it should trigger, not the voltage across the converter’s sense leads (pins 7 and 5). Therefore, the resistive drop on the board should be small enough so that output OVP does not trigger, even during load transients. OUTPUT VOLTAGE TRIM (Pin 6): 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 resis- tor between Pin 6 and Pin 5 (SENSE(-) input). For a desired decrease of the nominal output voltage, the value of the resis- tor should be Rtrim-down = ( 511) - 10.22 (kΩ) ∆% where ∆% = ( Vnominal – Vdesired) x 100% Vnominal To increase the output voltage, the user should connect a resis- tor between Pin 6 and Pin 7 (SENSE(+) input). For a desired increase of the nominal output voltage, the value of the resistor should be Figure C graphs the relationship between the trim resistor value and Rtrim-up and Rtrim-down, showing the total range the out- put voltage can be trimmed up or down. Figure C: 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 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 application note titled “Input System Instability”. The lockout cir- cuitry is a comparator with DC hysteresis. When the input volt- age is rising, 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 volt- age must fall below the typical Turn-Off Voltage Threshold value before the converter will turn off. Output Current Limit: The maximum current limit remains constant as the output voltage drops. However, once the imped- ance 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 heating 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 dam- age 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 cur- rent 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 thermal shutdown circuit is designed to turn the converter off when the temperature at the sensed location reaches the Rtrim-up (k Ω) ) where VOUT = Nominal Output Voltage = ( _ 511 _ 10.22 5.11VOUT(100+ ∆%) 1.225 ∆% ∆% 10 100 1,000 10,000 100,000 0 2 4 6 8 1012 1416 1820 % increase Vout % decrease Vout |
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