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PQ50120HZB55PNS-G Datasheet(PDF) 11 Page - SynQor Worldwide Headquarters |
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PQ50120HZB55PNS-G Datasheet(HTML) 11 Page - SynQor Worldwide Headquarters |
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11 / 14 page  Technical Specification Product # PQ50120HZx55 Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005483 Rev. 1 03/31/10 Page 11 Input:44-52V Output:12V Current:55A Part No.:PQ50120HZB55 APPLICATION CONSIDERATIONS Limited Output Voltage Resolution: The internal voltage control feedback loop has limited resolution. Therefore, the output voltage will exhibit discrete steps as the loop responds to changes in line, load, trim, or remote sense. For instance, on close examination, the startup ramp has a “stair-step” shape. Likewise, a load transient response will be composed of multiple discrete steps. The size of each step is well determined, and is shown in Figure C. A close-up picture of a single step is shown in Figure D. Stepping will not occur under steady state conditions. Current share and active trim not recommended: It is important to note that external feedback control using the sense or trim pins will cause sustained stepping. External current share or active trim circuits contain a separate reference voltage. After this external feedback has taken control, the actual output voltage can still differ from the external reference voltage by as much as the step size. If the external feedback loop integrates this error voltage, it will cause a limit cycle oscillation. For this reason, external feedback using the sense and trim pins is not recommended. 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. 0 20 40 60 80 100 120 140 35 40 45 50 55 60 65 70 75 Vin (V) = 12.0 Vout = 10.0 Vout ≤ 8.75 Vout Figure C: Output voltage resolution. Figure D: Smallest possible Vout step at 48Vin and 12Vout. * See Electrical Characteristics page. |
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