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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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Power Electronics Europe News
 
DC/DC converter regulates automotive cold-crank, stop-start

The synchronous rectification topology delivers 93% efficiency while switching at 2MHz. This, claims the company, enables designers to avoid critical noise-sensitive frequency bands, such as AM radio. Burst Mode operation keeps quiescent current under 2.5µA in no-load standby conditions, for always-on systems. The three to 42V input voltage range is suitable for automotive applications which must regulate through cold-crank and stop-start scenarios. Internal 3.5A switches deliver up to 2A of continuous output current with peak load currents of 3A.

Minimum dropout voltage is only 200mV (at1A) under all conditions, while spread spectrum frequency modulation and special design techniques offer low-EMI operation to minimise noise. A fast minimum on-time of 45ns enables 2MHz constant frequency switching from a 16V input to a 1.5V output.

The 10-lead thermally enhanced MSOP and high switching frequency provide a compact, thermally efficient footprint. Internal top and bottom, high-efficiency power switches, boost diode, oscillator, control and logic circuitry are integrated into a single die. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping output ripple below 10mVPK-PK. Other features include internal compensation, a power good flag, output soft start/tracking and thermal protection.

 




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