LM305H DATASHEET PDF

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The foldback current limiting, a fraction of the output voltage must be used to oppose the voltage across the current limit sense resistor. Most 10 juF capacitors have low enough internal series resistance to deliver 20A spikes when shorted. If the output is shorted, C2 will discharge through the ground pin, possibly damaging the regulator. The same ap- proach is used for the LM as in Datasheet 7.

Q4 may be any small signal PNP transistor. Adjustable 10A Regulator o. With temperature excursions, the solder work-hardens and with enough cycles the solder will ultimately fail. Obviously either a larger capacitor is required or ambient tem- perature must be reduced. Since output capacitors are no longer required Q3 is just used as a current sink and its emitter load has been removed.

This can cause operating speed differences in digital circuitry, interfacing problems or decrease noise margins.

Minimum operating voltage is about 12V. Increases over 10 jF do not appreciably improve the ripple rejection at frequencies above Hz. The current through R5, l 5can now be determined I. Many of today’s power devices transistors included are assembled using a TO- or TO-3 alumi- num soft solder system.

LML -5V and -6V Simplified thermal model of IC power regulator mounted to metal header. Resistor bypassing will not degrade regulation if, under worst-case conditions of maximum input voltage and minimum load current, the regulator lm305hh still delivering output current rather than absorbing current from the resistor.

The ground of R2can be returned near the ground of the load to provide remote ground sensing and improve load regulation. Although power dissipation is internally limited, these specifications are applicable for power dissipations of 2W for the TO-5 and 20W for the TO The output voltage temperature coefficient can be matched to the battery by inserting pm305h in series with the adjustment resistor for the regulator and coupling the diodes to the battery.

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The LM series alone of all the group requires an output capacitor to insure stable operation. Changes dztasheet output voltage due to heating effects are covered under the specification for thermal regulation. Further, a new subsurface zener structure gives low noise and excellent long term stability com- pared to ordinary monolithic zeners.

Q 2 and Q3 need eatasheet be matched. The designer is immediately confronted with a number of rectifier circuits and filter configurations.

LMH datasheet(6/7 Pages) NSC | Voltage Regulators

An LM is biased as a 10 mA current source to set the minimum current and provide operating current for the control circuitry. The problem is not the internal tem- perature datasgeet the transformer but the actual increase in watts lost.

The safe area protection circuit in the LM allows full output current at 15V differential and does not allow the current limit to drop to zero at high input-to-output differential voltages, thus preventing start up problems with high input voltages. Information is also supplied on heat sink selection and design, power transformer and filter specification, and on various extended use applications for the basic three-terminal and dual tracking regulators.

There is virtually no hysteresis in reference voltage with temperature cycling.

National Semiconductor

The stability problem with slower pass transistors, if it occurs at all, is usually seen only on the negative regulator. With a 10 i F bypass capacitor, 80 dB ripple rejection is obtainable at any output level.

The regulators also have hysteresis built into their thermal shutdown circuits so that the shutdown temperature is several degrees above the temperature at which the regulator turns back on. Two regulators are used, 1 for each polarity of the input as shown in Figure Generally, if oscillations cause other circuit problems, either a solid tantalum input capacitor or a solid tantalum dataheet series with 5J2 to lOfJ will cure the problem.

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The active circuitry reduces the dynamic impedance of the zener to about 0. Control of the connector configura- tion, such as using 2 ground pins to insure datsheet is connected first, is the best way of preventing this prob- lem. Thermal and Electronic Effects Few people realize that many of the important specifi- cation limits of high datassheet regulators are determined by thermal characteristics rather than electrical ones.

After extensive life testing, National Semiconductor has developed some average “acceleration factors” relating increased surface related failure rates to increased junction temperature. Stability is also achieved by methods that provide very good rejection of load or line transients as are usually seen with TTL logic.

For a bridge rectifier of the same output requirements, the only change is that: This line is, of course, the electrical analog of a thermal line, with temperature replacing voltage, thermal resistances replacing normal Rs, etc. Most 10 uF capacitors have low daatasheet internal series datahseet to deliver 20A spikes when shorted. Operating life decreases at high junction temperatures.

When the device is adjusted to 2. This can dztasheet checked by: The adjustment terminal can be bypassed to ground on the LMHV to improve ripple rejection. If true zero output is desired, the adjustment can be driven to —1.

This is the slope of the safe area curves in Figure A3.

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The LM has a new design that is operative datasbeet to about 2V. The temperature coeffi- cient of this junction combined with the temperature coefficient of the internal resistors gives the current limit a The discharge datahseet hints con’t current depends on the value of the capacitor, the output voltage of the regulator, and the rate of decrease of V fg. Devices like the LM adjustable regulator, LM 3A, 5V logic regulator or the LM negative regulators have a relatively temperature-stable current limit.