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PQ50073HZB60NNS-G Datasheet(PDF) 11 Page - SynQor Worldwide Headquarters |
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PQ50073HZB60NNS-G Datasheet(HTML) 11 Page - SynQor Worldwide Headquarters |
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11 / 12 page  Product # PQ50073HZB60 Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005484 Rev. B 10/25/12 Page 11 Input: 44-52V Output: 7.3V Current: 60A Package: Half-Brick Applications Section 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: A typical circuit diagram, Figure D below details the input filtering and voltage trimming. Input Filtering and External Input Capacitance: Figure E below shows 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 of the Electrical Specifications. More detailed information is available in the application note titled “EMI Characteristics” on the SynQor website. Output Filtering and External Output Capacitance: The internal output filter components are shown in Figure E below. This filter dramatically reduces output voltage ripple. Some minimum external output capacitance is required, as specified in the Output Characteristics area of the Electrical Characteristics section. No damage will occur without this capacitor connected, but peak output voltage ripple will be much higher. Thermal Considerations: For baseplated and encased versions, the max operating baseplate temperature, TB, is 100ºC. Refer to the Thermal Derating Curves in the Technical Figures section to see the available output current at baseplate temperatures below 100ºC. A power derating curve can be calculated for any heatsink that is attached to the base-plate of the converter. It is only necessary to determine the thermal resistance, RTHBA, of the chosen heatsink between the baseplate and the ambient air for a given airflow rate. This information is usually available from the heatsink vendor. The following formula can the be used to determine the maximum power the converter can dissipate for a given thermal condition if its base-plate is to be no higher than 100ºC. Pmax = 100ºC - TA diss RTHBA This value of maximum power dissipation can then be used in conjunction with the data shown in the Power Dissipation Curves in the Technical Figures section to determine the maximum load current (and power) that the converter can deliver in the given thermal condition. For convenience, Thermal Derating Curves are provided in the Technical Figures section. Vin External Input Filter Trim Vin(+) I load C load Vout(+) R trim-up or R trim-down Vsense(+) ON/OFF Vin(_) Vout(_) Vsense(_) Electrolytic Capacitor Figure D: Typical Application Circuit (negative logic unit, permanently enabled). C 2 C 1 Lin Vin(+) Vin(_) Vout(+) Vout(-) Regulation Stage Current Sense Isolation Stage Figure E: Internal Input and Output Filter Diagram (component values listed in Electrical Characteristics section). |
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