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PQ48015HGA40NKF Datasheet(PDF) 11 Page - SynQor Worldwide Headquarters |
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PQ48015HGA40NKF Datasheet(HTML) 11 Page - SynQor Worldwide Headquarters |
11 / 14 page 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 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” is available on the SynQor web site (www.synqor.com) which provides an understanding of why this instability arises, and shows the preferred solution for correcting it. Application Circuits: Figure D below provides a typical cir- cuit diagram which details the input filtering and voltage trim- ming. Input Filtering and External Capacitance: Figure E below provides a diagram showing the internal input filter components. This filter dramatically reduces input terminal rip- ple current, which otherwise could exceed the rating of an external electrolytic input capacitor. The recommended exter- nal input capacitance is specified in the “Input Characterisitcs” section. More detailed information is available in the applica- tion note titled “EMI Characteristics” on the SynQor website. Product # PQ48015HGA40 Phone 1-888-567-9596 Doc.# 005-2HG451C Rev. C 12/17/02 Page 11 Half Half Brick Brick Technical Specification 48Vin 1.5Vout 40A Vin External Input Filter Trim Vin(+) Iload Cload C1 L C2 Vout(+) Rtrim-up or Rtrim-down Vsense(+) ON/OFF Vin(_) Vin(+) Vin(_) Vout(_) Vsense(_) Electrolytic Capacitor 33µF ESR ≅1Ω Figure D: Typical application circuit (negative logic unit, permanently enabled). Figure E: Internal Input Filter Diagram (component values listed on page 3). |
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