User Manual

Figure 1
(Measurements are in inches.)
DE-SWADJ 3A Adjustable Voltage Regulator
Features
Drop-in replacement for any of the LM78XX
regulators
Outputs any voltage between 3v and 13v
Adjustment is by a 25-turn potentiometer, making
it easy to dial in exactly the right output
5 to 35V input voltage
Up to 25W output power
3A continuous output current
2
Efficiency up to 96%
Integrated bypass capacitors
Integrated heat sink
Weighs only
10
g
Applications
Battery powered applications
Robots
Battery charging and maintenance
Point of load voltage regulation
Any application needing a nonstandard voltage
Overclocking and over or under-volting standard
products for more performance or less power draw
General Description
The DE-SWADJ 3 is designed to be the
easiest possible way to utilize the benefits of
switch-mode power when you need an
unusual or easily changed voltage. The DE-
SWADJ family is pin-compatible with the
common 78XX family of linear voltage
regulators, and can step down to 3v to 13v
with no external circuitry required. It has
integrated decoupling capacitors, so external
capacitors are not generally necessary.
The DE-SWADJ 3 operates over a wide input
voltage range, from 5v to 35v, at up to three
amps of continuous output current. Maximum
power output is 25W. Efficiencies are up to
96% (Figure 2). Ripple is less than 1% of
output.
The DE-SWADJ 3 works on a breadboard,
making it an ideal solution for prototyping and
one-off circuits.