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PQ24150QGA07NRS Datasheet(PDF) 10 Page - SynQor Worldwide Headquarters |
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PQ24150QGA07NRS Datasheet(HTML) 10 Page - SynQor Worldwide Headquarters |
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10 / 13 page  Figure C graphs this relationship between Rtrim-down and ∆. The output voltage can be trimmed down as much as 20%. Figure C: Trim Down Graph for 15.0Vout A resistor connected between Pin 6 and Pin 7 will increase the output voltage. For a desired increase of ∆ percent of the nominal output voltage, the value of this resistor should be Figure D graphs this relationship between Rtrim-up and ∆. The output voltage can be trimmed up as much as 10%. Figure D: Trim Up Graph for 15.0Vout 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 trip, particularly during tran- sients. 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 +10%/-20% PROTECTION FEATURES Input Under-Voltage Lockout: The converter is designed to turn off when the input voltage is too low, help- ing avoid an input system instability problem, described in more detail below. The lockout circuitry is a comparator with dc hysteresis. When the input voltage is rising, it must exceed a typical value of 16V before the converter will turn on. Once the converter is on, the input voltage must fall below a typical value of 14.5V before the converter will turn off. Output Current Limit: The current limit does not change appreciably 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 approximately 60% of its nominal value, the converter turns off. The converter then enters a 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 pre- vents excessive heating of the converter or the load board. Output Over-Voltage Limit: If the voltage across the output pins exceeds the O.V. threshold, the converter will immediately stop switching. This prevents damage to the load circuit due to 1) a sudden unloading of the converter, 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. Thermal Shutdown: The PowerQor series has a temper- ature sensor located such that it senses the average temper- ature of the converter. The thermal shutdown circuit is designed to turn the converter off when the temperature at the sensed location reaches 125°C. It will allow the con- Product # PQ24150QGA07 Phone 1-888-567-9596 Doc.# 005-2QG215D_A 3/1/02 Page 10 Technical Specification 24Vin 15Vout 6.7A Quarter Quarter Brick Brick 10 100 1,000 10,000 0 2 4 6 8 10 12 14 16 18 20 % Decrease in Output Voltage 100 1,000 10,000 100,000 01 23 45 67 89 10 % Increase in Output Voltage Rtrim-up (k Ω) ) where VOUT = Nominal Output Voltage = ( _ 511 _ 10.22 5.11VOUT(100+∆%) 1.225 ∆% ∆% |
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Similar Description - PQ24150QGA07NRS |
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