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The only DC connection to ground on either regulator is through the resistor R5 or R8 that sets the hysteresis. Q1 loses base drive and so opens to isolate the regulator from V m. This eliminates line drops from appearing effectvely in series with the reference and degrading regulation.
Since the LM is a floating voltage regulator, it sees only the input-to-output voltage differential. When the device is adjusted to 2. If not already elim- inated in step a above, the LMH would also drop out at this time. Fairly complex external circuit Practical with some performance loss Practical with external circuit Complex external circuit Single capacitor Simple external circuit Simple and effective with two resis- tors Uses: Load and line regulation of a dual tracking regulator can be tested in the circuit of Figure A4.
If internal power dissipation becomes too high for the heat sinking provided, the thermal shutdown circuit takes over preventing the IC from overheating. With thermal limiting, a regulator is not destroyed by long time short circuits, overloads at high temperatures or inadequate heat sinking.
Since the positive regulator uses the negative regulator output for a reference, this also offers some additional indirect compensation to the positive regulator.
The LM has a new design that is operative down to about 2V. The output voltage temperature coefficient can be matched to the battery by inserting diodes in series with the adjustment resistor for the regulator and coupling the diodes to the battery. Insure that no-load Vin max does not exceed the value listed on the data sheets or in the table of Section 2. National Semiconductor First, there is the problem of the safe-area protection as mentioned earlier.
In smaller transformers hw VA rating size datashheet determined by the maximum permissible no-load to full-load regula- tion.
Transient re- sponse of all the regulators is improved when output capacitors are added. As R2 is adjusted, a portion of the 1. With negative regulators and datashee LM, there is an internal diode in parallel with D1 from output-to-input, eliminating the need for an external diode if the output capacitor is less than 25 fiF. If internal power dissipation becomes too high for the heat sinking provided, the thermal shutdown circuit datashdet over, preventing the IC from overheating.
Of course, programming currents other than 10 mA can be used depending upon the application. There- fore, it behooves the designer to be somewhat skeptical and to try to deal with reputable, datashee sources.
However, improper polarities can be applied accidently under many normal operating conditions, and the transient condition is often gone datwsheet it is recognized. Q2 conducts the quiescent current of the positive regulator. High-Voltage Regulator shorts which would temporarily reverse V n — Vrj polarity.
It is not necessary to bypass the output, although this does improve transient response somewhat. Worst case guarantees on output voltage deviation due to any combination of line, load or temperature variation assure satisfactory system operation.
This list is only representative. For float chargers on lead-acid type batteries all that is necessary is to set the output of the LM at the datashdet voltage and connect it to the battery. For value given, capacitor must be solid tantalum. This can be checked by: This added power loss adds to the total power dissipated in the circuit area. Various shutdown methods may be used. The larger the temperature change, the sooner failure will occur.
If the bypass capacitor is used, it is sometimes necessary to include protection diodes to prevent the capacitor from discharging through internal low current paths and damaging the device. A number of basic assumptions are made to avoid an academic discussion of unnecessary material.
N and V dropoutprovided that the amplifier can source the current required to raise Vq to Vo — Vreg- Example: The current set resistor con- nected between the adjustment terminal and the output terminal usually fi should be tied directly to the output of the regulator rather than near the load.
F or less, there is no need to use diodes. Input bypassing is needed, however, if the regulator is located very far from the filter capacitor of the power supply. Ordering information is covered in Appendix 2. One of the more unique applications for these switching regulators is as a tracking pre-regulator. For proper temperature compensation the diodes should be in the same thermal environment as the LM The illustrated values are safe for the typical IC regulator but should be checked in any specific application.
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