| Abstract |
This paper presents the L4973 device, a high efficiency step-down voltage feedforward mode switching regulator. It converts an unregulated continuous input voltage to a regulated output
voltage and can deliver up to 3.5 Amps with an input supply range from 8V to 55V. The default output voltage is 5.1 V or 3 .36V, but using two external resistances it can be changed from
50V down to a few hundreds of millivolts. The device is developed using the mixed Bipolar, Cmos, Dmos (BCD) second generation technology: it allows low consumption and very fast
switching transient which decrease the internal power dissipation and increase efficiency. At light loads a new system allows the correct regulator funcionality with high efficiency. The product
includes two fully integrated current protections against overload and short-circuit on the output, protections against feedback disconnection and feedback overvoltage, input-output synchronization function on the same pin, inhibit for stand-by operation, thermal shutdown and soft-start
function. The internal oscillator frequency can be modified up to 500KHz, varying.the external R-C net. |
