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PQ24033QGA25NRS Datasheet(PDF) 11 Page - SynQor Worldwide Headquarters |
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PQ24033QGA25NRS Datasheet(HTML) 11 Page - SynQor Worldwide Headquarters |
11 / 13 page Input: Input: Output: Output: Current: Current: PPackage: ackage: 18-36 V 18-36 V 3.3 V 3.3 V 25 A 25 A (82.5W) (82.5W) Quarter-brick Quarter-brick T Technical S echnical Specification pecification Product # PQ24033QGA25 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QG233D Rev. B 08/17/06 Page 11 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 cor- recting 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 com- ponents. 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. Startup Inhibit Period: The Startup Inhibit Period ensures that the converter will remain off for at least 200ms when it is shut down for any reason. When an output short is present, this generates a 5Hz "hiccup mode," which prevents the con- verter from overheating. In all, there are seven ways that the converter can be shut down, initiating a Startup Inhibit Period: • Input Under-Voltage Lockout • Input Over-Voltage Shutdown (not present in Quarter-brick) • Output Over-Voltage Protection • Over Temperature Shutdown • Current Limit • Short Circuit Protection • Turned off by the ON/OFF input Figure F shows three turn-on scenarios, where a Startup Inhibit Period is initiated at t0, t1, and t2: Before time t0, when the input voltage is below the UVL thresh- old, the unit is disabled by the Input Under-Voltage Lockout fea- ture. When the input voltage rises above the UVL threshold, the Input Under-Voltage Lockout is released, and a Startup Inhibit 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 100µF 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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