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DC-DC Converters BBF2803S - 11 Pages

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Catalogue excerpts

M.S.KENNEDY CORP. FEATURES: All Ceramic Capacitors Surface Mount Magnetics MIL STD 461C CR03 (DC-DC Converters) 80 Volt Input Transient Tolerent Wide Supply Range - 16V to 50V High Isolation - 500V High Power Density - 17W/in³ Output Voltage Adjustment - Standard Remote Shutdown Operates to 14V Input at 10W Available with 3.3V, 5V, 12V and 15V Outputs Contact MSK for MIL-PRF-38534 Qualification Status DESCRIPTION: The BBF2800S series of DC-DC converters provides the ruggedness, reliability and features required to meet the advanced design challenges of today's hi-rel market. This has been accomplished using a package having very low thermal gradients, excellent hermeticity and high voltage isolation. The use of advanced substrate and reflow soldering techniques during construction results in a rugged, cost-effective pin solderable package. The BBF2800S hybrid converter series utilizes all ceramic capacitors and surface mount magnetics to provide reliable operation at all operating temperatures while surviving very high G forces. BBF2800S series standard features include kelvin sense, indefinite short circuit protection, remote shutdown, output fault monitoring, turn on voltage point adjustment, switching frequency synchronization of up to 3 units using no external components and pi-network input filtering. An output voltage adjustment/load compensation pin is also standard. Fault tolerance design protects these converters from most external circuit faults. The output and output adjust pins will withstand +35V while the shutdown and all synchronization pins will withstand +50V protecting the converters from a variety of system or board faults, i.e. solder bridges, etc. Unique load fault protection circuitry allows this converter to pull up loads having difficult static load line characteristics and allows short term load excursions significantly beyond ratings in most applications. The BBF2800 series is a current mode push-pull topology converter which operates at a switching frequency of 500KHz. Internal filtering of both input and output eliminates the need for external capacitors in many applications. The 12-pin power dip package allows connection to a heatsink and is hermetically sealed and isolated from the internal circuits.

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EQUIVALENT SCHEMATIC PIN-OUT INFORMATION Isolated Step Down Power Supply Microprocessor Power Source Low Voltage Subsystem Power Source +Input Shutdown Plus Clock Adjust/Comp -Output +Output -Input Timing 2 Timing 1 Case -Sense +Sense ABSOLUTE MAXIMUM RATINGS ○ TST Storage Temperature Range TLD Lead Temperature Range (10 Seconds) PD Power Dissipation TJ Junction Temperature θJC Thermal Resistance (Switches) ○ +50V VIN Input Voltage (pin 7 to pin 6) Input Transient (pin 7 to pin 6 @ 50mS) 80V VINT Output Current 1 IOUT BBF2803S 5.5A BBF2805S 4.0A BBF2812S 1.9A BBF2815S 1.5A Case Temperature Range...

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ELECTRICAL SPECIFICATIONS Output Voltage Output Current 2 8 Output Voltage Ripple Input Current Ripple 2 Line Regulation Load Regulation Efficiency Step Load Response Step Load Recovery 2 Step Line Response 2 Step Line Recovery 2 Start Up Overshoot Start Up Delay Shutdown Delay 2 Shutdown Recovery 2 Input Voltage Range 2 Quiescent Current Capacitive Load 2 Isolation Input to output or any pin to case @ 500V Short Circuit Current Limit 7 Switching Frequency VOUT Adjustment Range NOTES: +VIN = 28V, IOUT = 5.5A, TA=TC=25°C unless otherwise specified. Guaranteed by design but not tested. Typical parameters...

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ELECTRICAL SPECIFICATIONS Output Voltage Output Current 2 Output Voltage Ripple Input Current Ripple 2 Line Regulation Load Regulation Efficiency Step Load Response Step Load Recovery Step Line Response 2 Step Line Recovery 2 Start Up Overshoot Start Up Delay Shutdown Delay 2 Shutdown Recovery 2 Input Voltage Range 2 Quiescent Current Short Circuit Current Limit Input to output or any pin to case @ 500V VOUT Adjustment Range Switching Frequency NOTES: +VIN = 28V, IOUT = 4.0A, TA=TC=25°C unless otherwise specified. Guaranteed by design but not tested. Typical parameters are representative of actual...

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ELECTRICAL SPECIFICATIONS Output Voltage Output Current 2 Output Voltage Ripple Input Current Ripple 2 Line Regulation Load Regulation Efficiency Step Load Response 2 Step Line Recovery 2 Step Line Response 2 Step Load Recovery 2 Start Up Overshoot Start Up Delay Shutdown Delay 2 Shutdown Recovery 2 Input Voltage Range 2 Quiescent Current Short Circuit Current Limit Input to output or any pin to case @ 500V VOUT Adjustment Range Switching Frequency NOTES: +VIN = 28V, IOUT = 1.9A, TA=TC=25°C unless otherwise specified. Guaranteed by design but not tested. Typical parameters are representative of...

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ELECTRICAL SPECIFICATIONS Output Voltage Output Current 2 Output Voltage Ripple Input Current Ripple 2 Line Regulation Load Regulation Efficiency Step Load Response Step Line Response Step Line Recovery 2 Step Load Recovery 2 Start Up Overshoot Start Up Delay Shutdown Delay 2 Shutdown Recovery 2 Input Voltage Range 2 Short Circuit Current Limit Input to output or any pin to case @ 500V Quiescent Current VOUT Adjustment Range Switching Frequency NOTES: +VIN = 28V, IOUT = 1.5A, TA=TC=25°C unless otherwise specified. Guaranteed by design but not tested. Typical parameters are representative of actual...

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APPLICATION NOTES POWER SUPPLIES MULTIPLE CONVERTER SYNCHRONIZATION The output voltage of the BBF2800S may be adjusted from 90% to 110% of nominal value by the use of a 50KΩ potentiometer as shown. Adjustment beyond this range is possible however certain characteristics of the converter such as but not limited to input voltage range, efficiency, ripple and temperature performance will change. Characterization by the user is recommended in such applications. Synchronized operation of up to three BBF2800S series converters may be accomplished without external components. One unit selected to be...

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TYPICAL APPLICATION CIRCUIT The above diagram shows the remote sense feature which reduces Vo errors due to the resistance of the conductors feeding the load. This diagram also shows the connections for non-synchronized operation (TIMING 1 and 2) as well as output voltage trim, remote shutdown, fault monitoring, and input voltage turn on point adjustment.

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