LM350K DATASHEET PDF

LM350K DATASHEET PDF

LMK STMicroelectronics Linear Voltage Regulators V Adj Positive datasheet, inventory, & pricing. In operation, the LM develops a nominal V reference voltage, V(REF), between the output and adjustment terminal. The reference. LMK Datasheet, LMK 3A 3-Terminal Adjustable Positive Voltage Regulator Datasheet, buy LMK.

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The LM series of adjustable 3-terminal positive voltage. They are exceptionally easy to. Further, both line and load regulation are compa. Also, the LM is packaged in. In addition to higher performance than fixed regulators, the.

National Semiconductor

LM series offers full overload protection available only in. Included on the chip are current limit, thermal overload. Normally, no capacitors are needed unless the device is situ.

Besides replacing fixed regulators or discrete designs, the. LM is useful in a wide variety of other applications. By connecting a fixed resistor between the adjustment pin. Supplies with electronic shutdown can be.

National Semiconductor – datasheet pdf

The part numbers in the LM series which have a K suffix. In operation, the LM datasheeh a nominal 1. The reference voltage is impressed across program resistor. R1 and, since the voltage is constant, a constant current I 1. The LM is capable of providing extremely good load. The current set resistor connected be. For example, a 15V regulator with. Figure 2 shows the effect of resistance between the regula.

I ADJ and make it very constant with line and load changes. To do this, all quiescent operating current is returned eatasheet the. An input bypass capacitor is recommended. The device is more sensitive pm350k. The adjustment terminal can be bypassed to ground on the. LM to improve ripple rejection. If the bypass capacitor is used, it is. In general, the best type of capacitors to use is solid tanta.

Solid tantalum capacitors have low impedance even at.

Depending upon capacitor construction, it. Although the LM is stable with no output capacitors, like.

This occurs with values be. Regulator with Line Resistance. With the TO-3 package, it is easy to minimize the resistance. The ground of R2 can be returned near the. When external capacitors datasyeet used with any IC regulator it is.

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Although the surge is short, there is enough energy. When an output capacitor is connected to a regulator and. The discharge current depends. In the LM, this dis. This is not true of other types of. The bypass capacitor on the adjustment terminal can dis. No protection is needed for output voltages of 25V or. Adjusting Multiple On-Card Regulators. Simple 12V Battery Charger. Use of R S allows low charging rates with datassheet charged battery. They are exceptionally easy to use and require only 2 external resistors to set the output voltage.

Further, both line and load regulation are compa- rable to discrete designs. Also, the LM is packaged in standard transistor packages which are easily mounted and handled. Included on the chip are current limit, thermal overload protection and safe area protection.

All overload protection circuitry remains fully functional even if the adjustment termi- nal is accidentally disconnected. Normally, no capacitors are needed unless the device is situ- ated more than 6 inches from the input filter capacitors in which case an input bypass is needed. Besides replacing fixed regulators or discrete designs, the LM is useful in a wide variety of other applications. By connecting a fixed resistor between the adjustment pin and output, the LM can be used as a precision current regulator.

Supplies with electronic shutdown can be achieved by clamping the adjustment terminal to ground which programs the output to 1. The part numbers in the LM series which have a K suffix are packaged in a ratasheet Steel TO-3 package, while those with a T suffix are packaged in a TO plastic package.

Features n Adjustable output down to 1. The reference voltage is impressed across program resistor R1 and, since the voltage is constant, a constant current I 1 then flows through datashret output datasyeet resistor R2, giving an out- put voltage of tween pF and pF. This eliminates line drops from appearing effectively in series with the reference and degrading regulation. For example, a 15V regulator with 0. If the set resistor is connected near the load the effective line re- sistance will be 0.

To do this, all quiescent operating current is returned to the output establishing a minimum load current requirement. If there is insufficient load on the output, the output will rise. The device is more sensitive to the absence of input bypassing when adjustment or output capacitors are used but the above values will eliminate the possibility of problems.

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The adjustment terminal can be bypassed to ground on the LM to improve ripple rejection. This bypass capacitor prevents ripple from being amplified as the output voltage is increased. 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.

In general, the best type of capacitors to use is lm350, tanta- lum. Solid tantalum capacitors have low impedance even at high frequencies.

Ceramic capacitors are also good at high datasbeet, but some types have a large decrease in capacitance at frequencies around 0. For this reason, 0.

Although the LM is stable with no output capacitors, like any feedback circuit, certain values of external capacitance can cause excessive ringing. Regulator with Line Resistance in Output Lead With the TO-3 package, it is easy to minimize the resistance from the case to the set resistor, by using two separate leads to the case.

The ground of R2 can be returned near the ground of the load to provide remote ground sensing and im- prove load regulation. Although the surge is short, there is enough energy to damage parts of the IC. When an output capacitor is connected to a regulator and the input is shorted, the output capacitor will discharge into the output of the regulator. The discharge current depends on the value of the capacitor, the output voltage of the regu- lator, and the rate of decrease of V IN.

In the LM, this dis- charge path is through a large junction that is able to sustain 25A surge with no problem. This is not true of other types of positive regulators. The bypass capacitor on the adjustment terminal can dis- charge through a low current junction.

Discharge occurs when either the input or l,350k is shorted. No protection is needed for output voltages of 25V or 5 www.