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When the device is adjusted to 2.

(PDF) LM305 Datasheet download

Since the positive regulator uses the negative regulator output for a reference, this also offers some lm3005h indirect compensation to the positive regulator. When a positive regulator except for the LM is loaded dataasheet a negative supply, the problem of start-up can be doubly bad.

With the TO-3 package, it is easy to minimize the resis- tance from the case to the set resistor, by using two lm3005h leads to the case. Q2 conducts the quiescent current of the positive regulator. Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. N and V dropoutprovided that the amplifier can source the current required to raise Vq to Vo – Vreg- Example: The LM is an IC zener which has exceptionally low dynamic impedance so the negative supply need not be well regulated.

Lm305h datasheet pdf

Supplies with electronic shutdown can be achieved by clamping the adjustment terminal to ground which programs the output to 1. Q- always operates as a switch and needs no heat sinking. In Figure 1, a typical LM’s output drifts only 3 mV or 0.

Datashest that a 10 mA programming current is used since lab supplies are often used with no-load, and lm305n LM requires a worst-case minimum load of 10 mA. Start-up problems can occur from the current limit circuitry too. The response is due to dagasheet electronic and thermal effects. P er Watt, within the first 10 ms after a step of power is applied. The current set resistor connected between the adjustment terminal and the out- put terminal usually fi should be tied directly to the output of the regulator rather than near the load.


Of course, programming currents other than 5 mA can be used depending upon the application. If such feedthrough is a problem the most common first step is to use an electrostatic shield between windings.

With a heat sink, the effective thermal resistance can only approach the junction to case ,m305h specified, depending on the efficiency of the sink.

The 3 amp regulator is virtually blowout proof. T R Se in this case will be: A new subsurface breakdown dwtasheet used in the LM gives lower noise and better long term stability than conventional IC zeners. Battery charging is another application uniquely suited for the LM Make initial selection from Figure 1.

The bypass capacitor on the adjustment terminal C2 can discharge through a low current junction. Don’t let your supplies dominate the statistics column!

If transients exceed the maximum rated input voltage of theor reach more than 0. The LM series devices are packaged in a standard hermetic TO package inside a thermal shield.

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Its disadvantages are many: Current source Q1 forces current l 2 to flow through resistor R5. Diode D3 prevents l 3 from being shunted through R CL. LM Load Regulation L. This insures that the thermal limiting works as well as reducing infant mor- tality.


This can be checked by: Increases over 10 jF do not appreciably improve the ripple rejection at frequencies above Hz. Regulation is measured at lm05h constant junction temperature by pulse testing with a low duty cycle. This 5 mA then flows through R2, increasing the voltage at the adjustment terminal om305h therefore the output voltage.

Datazheet these advances in design, the LM is now guaran- teed to have line and load regulation that is a factor of 2 better than previously available devices.

The shutdown characteristics of Figure 7. Series resistance between the output of the regulator and programming resistor R1 should be minimized. This is dependent upon load current and junction tempera- ture. Also, the LM is packaged in standard transistor packages which are easily mounted and handled.

LMH Datasheet, PDF – Alldatasheet

The schematic does not in- clude a pulse generator, but an LMCN can be used datashret generating variable amplitude negative pulses to drive the PNP switch Q 3.

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. Applying this electrical analog for a step increase of power in the pass transistor, it is seen that there is an immediate increase in the power transistor temperature, Tp.

Note 2; Regulation is measured at a constant junction temperature datwsheet pulse testing with a low duty cycle.