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PQ60015EKX25 Datasheet(PDF) 12 Page - SynQor Worldwide Headquarters |
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PQ60015EKX25 Datasheet(HTML) 12 Page - SynQor Worldwide Headquarters |
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12 / 15 page  Product # PQ60015EKx25 Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005264 Rev. A 07/13/09 Page 12 Input: Output: Current: Part No.: 35-75V 1.5V 25A PQ60015EKx25 Technical Specification 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 input electrolytic 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. Startup Inhibit Period: The Startup Inhibit Period ensures that the converter will remain off for approximately 200ms when it is shut down for any reason. In all, there are five ways that the converter can be shut down, initiating a Startup Inhibit Period: • Input Under-Voltage Lockout • Output Over-Voltage Protection • Over Temperature Shutdown • Current Limit • Turned off by the ON/OFF input 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 D: Typical application circuit (negative logic unit, permanently enabled). Figure E: Internal Input Filter Diagram (component values listed on the specifications page). Electrolytic Capacitor 47µF |
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