eorex
EP1084
V
OUT
= V
REF
×
⎜
1
+
⎛
⎝
R2
⎞
R1
⎠
⎟
+I
FB
R2
Load Regulation
Since the EP1084 is only a 3 terminal device, it is not possible to provide true remote sensing of the
output voltage at the load. The best load regulation is achieved when the bottom side of R2 is connected
to the load and the top-side of R1 resistor is connected directly to the case or the V
OUT
pin of the
regulator and not to the load. It is important to note that for high current applications, this can re-present
a significant percentage of the overall load regulation and one must keep the path from the regulator to
the load as short as possible to minimize this effect.
Stability
The EP1084 requires the use of an output capacitor as part of the frequency compensation in order to
make the regulator stable. For most applications a minimum of 10uF aluminum electrolytic capacitor
insures both stability and good transient response.
Thermal Design
The EP1084 incorporates an internal thermal shutdown that protects the device when the junction
temperature exceeds the maximum allowable junction temperature. Although this device can operate
with junction temperatures in the range of 150
°C
, it is recommended that the selected heat sink be
chosen such that during maximum continuous load operation the junction temperature is kept below the
temperature.
Layout Consideration
The output capacitors must be located as close to the V
OUT
terminal of the device as possible. It is
recommended to use a section of a layer of the PC board as a plane to connect the V
OUT
pin to the
output capacitors to prevent any high frequency oscillation that may result due to excessive trace
inductance.
Jul. 2006
6/8
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