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PQ50090QGB11 Datasheet(PDF) 11 Page - SynQor Worldwide Headquarters |
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PQ50090QGB11 Datasheet(HTML) 11 Page - SynQor Worldwide Headquarters |
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11 / 13 page  Technical Specification Product # PQ50090QGB11 Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005485 Rev. A 03/29/10 Page 11 Input:48V Output:9.0V Current:11A Part No.:PQ50090QGB11 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 website 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 circuit diagram which details the input filtering and voltage trimming. Input Filtering and External Capacitance: Figure E 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 specified in the “Input Characteristics” section. More detailed information 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(_) Electrolytic Capacitor 47µF 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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