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A New Approach to Circuit Breaker Design Using Silicon Carbide Switches - Nov 21
Mechanical circuit breakers can be low cost with minimal losses, but they operate slowly and wear out. Solid state versions overcome the problems and are becoming increasing viable as replacements at...
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Synchronous boost controller provides up to 97% efficiency

The boost controller drives two N-channel power MOSFET stages out-of-phase to reduce input and output capacitor requirements. As a result, smaller inductors can be use rather than the single-phase equivalent. The input surge stopper, with adjustable clamp voltage, controls the gate of an N-channel MOSFET to protect against high input voltage transients of greater than 100V. It also provides inrush current control, over-current protection and output disconnect. The integrated ideal diode controller drives another N-channel MOSFET for reverse input voltage protection and voltage holdup or peak detection.

 

The controller can be used in automotive, industrial and medical systems. It can be configured to regulate a 24V/10A output from a car battery (12V) at up to 97% efficiency. The low 55µA quiescent current in Burst Mode operation extends battery life and minimises power loss at light loads. Operating from an input voltage of 4.5 to 65V, with 75V peak, the controller can regulate an output voltage up to 60V and the powerful onboard adjustable 5.0 to 10V gate drivers are capable of slewing large logic-level or standard threshold MOSFET gates quickly.

 

In keep-alive applications, the controller allows the synchronous MOSFET to be kept on continuously so that the output voltage follows the input voltage with minimal power loss. The current mode control architecture uses a phase-lockable frequency from 75 to 850kHz or fixed frequency adjustable from 50 to 900kHz. The boost controller, surge stopper and ideal diode can be shut down independently. There is an adjustable soft-start, a power good output and maintains ±1% reference voltage accuracy over an operating junction temperature range of -40 to 125°C.

           

The controller is available in TSSOP-38 and 5.0 x 7.0mm QFN-38 packages and with three temperature grades – extended, industrial and high temperature automotive.

 

 

 

  

 



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