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BQ60120HEB25PNS Datasheet(PDF) 11 Page - SynQor Worldwide Headquarters |
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BQ60120HEB25PNS Datasheet(HTML) 11 Page - SynQor Worldwide Headquarters |
11 / 13 page Product # BQ60120HEA30 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2BH612M Rev. B 09/02/05 Page 11 Input: Input: Output: Output: Current: Current: PPackage: ackage: 35-75 V 35-75 V 12 V 12 V 30 A 30 A Half-brick Half-brick T Technical S echnical Specification pecification 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 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. 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” available on the SynQor website. The lockout circuitry is a comparator with DC hysteresis. When the input voltage is rising, it must exceed the typical “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 converter will turn off. Output Current Limit: If the output current exceeds the "Output DC Current Limit Inception" point*, then a fast linear cur- rent limit controller will reduce the output voltage to maintain a constant output current. There is no minimum operating output voltage. The converter will run with low on-board power dissi- pation down to zero output voltage. A redundant circuit will shut- down the converter if the primary current limit fails. 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 characteristic can be seen in Figure 19. 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 out- put 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. 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. Start-up Inhibit Period: If any protection feature causes the converter to shut down, the converter will attempt to restart after 2ms (typical), the "Startup Inhibit Period".* On initial applica- tion of input voltage, with the on/off pin set to enable the con- verter, the "Turn-On Time"* will increase by only 2ms. * See specification 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 |
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