Yozshuran Internal Thermal Overload Protection 4. For large voltage differences, the energy lost as heat can ultimately be greater than that provided to the circuit. This page was last edited on 6 Julyat The LM relates in the same way to the fixed 79xx regulators. The LM is designed to compensate for these fluctuations internally, making such measures unnecessary. Three-Terminal Positive Voltage Regulator. Because some quiescent current flows from the adjustment pin of the device, an error term is added:.
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Features, Applications The is an adjustable 3-terminal positive voltage regulator capable of supplying in excess 1. This voltage regulator is exceptionally easy to use and requires only two external resistors to set the output voltage. Further, it employs internal current limiting, thermal shutdown and safe area compensation, making it essentially blow-out proof.
The LM serves a wide variety of applications including local, on card regulation. This device can also be used to make a programmable output regulator, or by connecting a fixed resistor between the adjustment and output, the LM can be used as a precision current regulator.
Output Current in Excess 1. See general marking information in the device marking section on page 10 of this data sheet. Cin is required if regulator is located an appreciable distance from power supply filter. CO is not needed for stability, however, it does improve transient response. Characteristics Line Regulation Note 3. Imax 1. Load and line regulation are specified at constant junction temperature.
Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used. Power dissipation within an IC voltage regulator produces a temperature gradient on the die, affecting individual IC components on the die.
These effects can be minimized by proper integrated circuit design and layout techniques. Thermal Regulation is the effect of these temperature gradients on the output voltage and is expressed in percentage of output change per watt of power change in a specified time. CAdj, when used, is connected between the adjustment pin and ground.
Since Long-Term Stability cannot be measured on each device before shipment, this specification is an engineering estimate of average stability from lot to lot.
LM Adjust Cin 0.
Kikazahn Failure to do this may cause the circuit to short. This page was last edited on 6 Julyat In use an LM commonly requires a heat sink to prevent the operating temperature rising too high. Archived from the original on 17 December The alternative is to use a switching voltage regulator which is usually more efficient but has a larger footprint and requires a larger number of associated components. Internal Thermal Overload Protection 4. This voltage regulator is exceptionally easy to use and requires only two external resistors to set the output voltage. If the adjustment pin is connected to ground the output pin delivers a regulated voltage of 1.
LM317BT DATASHEET PDF