AN2833 Datasheet, PDF (1/32 Pages) STMicroelectronics – Dual step-down controller with auxiliary voltages for industrial system power

AN2833
Application note
Dual step-down controller with auxiliary voltages
for industrial system power
Introduction
The PM6681A is a dual step-down controller with adjustable output voltages that can be
used in industrial power systems and this demonstration kit represents a typical application
circuit. The PM6681A demonstration kit allows testing all the device's functions and provides
two switching sections, with (typically) 3.3 V (OUT1) and 1.8 V (OUT2) outputs from 5.5 V to
36 V input voltage. The typical operating switching frequency of the two available sections is
200 kHz/300 kHz, respectively. Each switching section delivers more than 2.5 A output
current. An internal linear regulator provides a fixed 5 V output voltage. Another internal
linear regulator provides an adjustable output voltage (default 2.5 V). Both linear regulators
can deliver up to 100 mA peak current.
Figure 1. PM6681A demonstration kit
February 2009
Rev 2
AM01436v1
1/32
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