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PQ60012EGw20xyz Datasheet(PDF) 11 Page - SynQor Worldwide Headquarters |
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PQ60012EGw20xyz Datasheet(HTML) 11 Page - SynQor Worldwide Headquarters |
11 / 13 page Product # PQ60012EGL20 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2EG621G Rev. D 04/09/10 Page 11 Input: Input: Output: Output: Current: Current: PPackage: ackage: 35-75 V 35-75 V 1.2 V 1.2 V 20 A 20 A Eighth-brick Eighth-brick T Technical S echnical Specification pecification Output Current Limit: The maximum current limit remains con- stant 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 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 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 200 ms the converter will automatically restart. 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 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. APPLICATION CONSIDERATIONS Input System Instability: This condition can occur because any DC/DC converter appears incrementally as a negative resistance load. A detailed application note titled “Input System Instability” available on the SynQor website which provides an understanding of why this instability arises, and shows the pre- ferred solution for correcting it. Application Circuits: Figure E below provides a typical circuit diagram which details the input filtering and voltage trimming. Input Filtering and External Capacitance: Figure F below provides a diagram showing the internal input filter components. This filter dramatically reduces input terminal ripple current, which otherwise could exceed the rating of an external electrolytic input capacitor. The recommended external input capacitance is spec- ified in the “Input Characteristics” section. More detailed infor- mation is available in the application note titled “EMI Characteristics” on the SynQor website. Vin External Input Filter Trim Vin(+) Iload Cload L C Vout(+) Rtrim-up or Rtrim-down Vsense(+) ON/OFF Vin(_) Vin(+) Vin(_) Vout(_) Vsense(_) Figure E: Typical application circuit (negative logic unit, permanently enabled). Figure F: Internal Input Filter Diagram (component values listed on the specifications page). Electrolytic Capacitor 47µF |
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