LM/LM 5-Amp Adjustable Regulators. General Description. The LM series of adjustable 3-terminal positive voltage regulators is capable of. LM LM 5-Amp Adjustable Regulators. General Description. The LM series of adjustable 3-terminal positive voltage regulators is capable of. The LM is rated for −55˚C ≤ TJ ≤ +˚C, and the LM is rated for .. Reproduction of TI information in TI data books or data sheets is permissible only if.
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In the LM this discharge path is through a large junction that is able to sustain 25A surge with no problem. Alternating current wikipedialookup. 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 datassheet device.
The current limit circuitry allows peak currents of up to 12A to be drawn from the regulator for short periods of time.
Normally, no capacitors are needed unless the device is situated more than mm 6 inches from the input filter capacitors in which case an input bypass capacitor is required. Regulator with Protection Diodes. For example, a 15V regulator with 0. The LM family is supplied in a standard 3-lead transistor package.
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However, SGS-THOMSON Microelectronics assumes no responsability for the consequences of use of such information nor for any infringement of patents or other rights ln338k third parties which may results from its use.
When external capacitors are used with a voltage regulator it may be necessary to use protection diodes to prevent the capacitors from discharging through low current points into the voltage regulator.
National Semiconductor – datasheet pdf
This occurs with values between pF and pF. Solid tantalum capacitors have low impedance even at high frequencies. Pulse-width modulation wikipedialookup. The bypass capacitor on the adjustment terminal can discharge through a low current junction.
LMK Datasheet(PDF) – National Semiconductor (TI)
Voltage optimisation wikipedialookup. The dropout voltage of the IC regulator is about 1. Although the surge is short, there is enough energy to damage parts of the IC.
For this reason, 0. Stray voltage wikipedialookup. Current mirror wikipedialookup. To do this, all quiescent operating current is returned to the output establishing a minimum load current requirement. Changes in output voltage due to heating effects are taken into account separately by thermal rejection.
A unique feature of the LM datasheef is time-dependent current limiting. Control system wikipedialookup. This allows the LM to be used with heavy transient loads and speeds start-up under full-load conditions. Ohm’s law wikipedialookup. This eliminates line drops from dafasheet effectively in series with the reference and degrading regulation. Electrical ballast wikipedialookup.
Figure 3 shows an LM with protection diodes included for use with outputs greater than 25V and high values of output capacitance. Even small capacitors can have a low enough internal series lm338k to be able to deliver 20A spikes when shorted. Schmitt trigger wikipedialookup.
No protection diodes are required for output voltages of less than 25V or greater than 10 uF capacitance. Regulation is measured at constant junction temperature.
The adjustment terminal can be bypassed to ground on the LM to improve ripple rejection.
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.
Last update 6 January Since the regulator is “floating” and sees only the input-to-output differential voltage, supplies of several hundred volts can be regulated as long as the maximum input lm33k input differential is lm3338k exceeded. Under sustained loading conditions, the current limit decreases to a safe value protecting the regulator. Discharge occurs when either the input or output is shorted.
An optional output capacitor can be added to improve transient response. Plan to be about 3V about the desired output voltage. The discharge current depends on the value of the capacitor, the output voltage of the regulator, llm338k the rate of decrease of VI.
Switched-mode power supply wikipedialookup. The adjustment terminal can be bypassed to achieve very high ripple rejection ratios which are difficult to achieve with standard 3-terminal regulators. Voltage regulator wikipedialookup. Tube sound wikipedialookup.
The ground of R2 can be returned near the ground of the load to provide remote ground sensing and improve load regulation. Opto-isolator wikipedialookup. Resistive opto-isolator wikipedialookup.
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