Direct Effi cient DC/DC Conversion of 100V Inputs for Telecom/Automotive SuppliesAutomotive, telecom and industrial systems have harsh,unforgiving environments that demand robust electronicsystems. In telecom systems the input rail can vary from36V to 72V, with transients as high as 100V. In automotivesystems the DC battery voltage may be 12V, 24V or 42Vwith load dump conditions causing transients up to 60Vor more. The LTC®3810 is a current mode synchronousswitching regulator controller that can directly stepdown input voltages up to 100V, making it ideal for theseharsh environments. The ability to step down the highinput voltage directly allows a simple single inductortopology, resulting in a compact high performance powersupply—in contrast to the low side drive topologies thatrequire bulky, expensive transformers.
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