PL1084A-XXXF3 Datasheet, PDF (4/6 Pages) Cystech Electonics Corp. – 5A Low Dropout Positive Voltage Regulator

Spec. No. : C547F3
CYStech Electronics Corp. Issued Date : 2007.09.26
Revised Date
Page No. : 4/6
Load Regulation
Since the PL1084A is only a 3 terminal device, it is not possible to provide true remote sensing of 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 is connected directly to the case or the Vout pin of the regulator and not to the load. It is important to note that for
high current applications, this can represent 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 PL1084A 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 10μF aluminum electrolytic capacitor insures both stability
and good transient response.
Thermal Design
The PL1084A incorporates an internal 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℃, 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 Vout 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 Vout pin to the output capacitors to prevent any high
frequency oscillation that may result due to excess trace inductance.
PL1084A-XXXF3
CYStek Product Specification