Datasheet

TS78L00 Series
3-Terminal 100mA Positive Voltage Regulator
7/12 Version: A07
Application Information
Design Considerations
The TS78L00 Series of fixed voltage regulators are designed with Thermal Overload Protection that shuts down the
circuit when subjected to an excessive power overload condition. Internal Short Circuit protection Limits the maximum
current the circuit will pass.
In many low current applications, compensation capacitors are not required. However, it is recommended that the
regulator input be bypassed with a capacitor if the regulator is connected to the power supply filter with long wire
lengths, or if the output load capacitance is large. The input bypass capacitor should be selected to provide good high-
frequency characteristics to insure stable operation under all load conditions. A 0.33uF or larger tantalum, mylar, or
other capacitor having low internal impedance at high frequencies should be chosen. The bypass capacitor should be
mounted with the shortest possible leads directly across the regulators input terminals. Good construction techniques
should be used to minimize ground loops and lead resistance drops since the regulator has no external sense lead.
Bypassing the output is also recommended.
FIGURE 2 – ±15V Tracking Voltage Regulator
FIGURE 7 – Current Regulator
The TS78L00 regulators can also be used as a current
source when connected as above. In order to minimize
dissipation the TS78L05 is chosen in this application.
Resistor R determines the current as follows:
I
IB
=3.8mA over lined and load changes
For example, a 100mA current source would require R to
be a 50Ω. 1/2W resistor and the output voltage compliance
would be the input voltage less 7V.
FIGURE 8 – ±15V Tracking Voltage Regulator