LM–XX. Input. Cin*. µF. CO**. Output. 1. MOTOROLA ANALOG IC DEVICE DATA. Three-Terminal Positive. Fixed Voltage Regulators. This family of fixed. the LM is available in the SOT package, as well .. †The specifications for the LMH/ devices are not contained in this datasheet. Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2All trademarks are the property of their respective.
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Sign up or log in Sign up using Google. Tantalum capacitors are completely unnecessary in this application. There is no reason to not use them there. Tantalums have a low ESR! Its principal role is to provide datasyeet stability for the regulator. The output capacitor is critical in maintaining regulator stability, and must meet the required conditions for both minimum amount of capacitance and ESR Equivalent Series Resistance.
The output capacitor is NOT a filter capacitor in any traditional sense. XX these two digits of the type number indicate.
Heatsink surface is connected to Pin 2. Would the output oscillate with high ripple or be undefined or what exactly would l340 In this case the peers are scattered all over the internet.
Series 3-Terminal Positive Regulators
They say in the LM datasheet. Email Required, but never shown. Because if someone like you finds something wrong you are able to correct it. Lm pdf, lm description, lm datasheets, datasjeet view.
This family of fixed voltage regulators are monolithic integrated circuits. With the price of tantalum these days I would recommend using one of your electrolytics with a small ceramic capacitor in parallel – say nF.
The only reason for choosing tantalum might be lifetime, and this can be datashedt for with aluminium wet electrolytic caps. An eg 10 ohm resistor could be placed in series with the capacitor without impeding its functionality. The output capacitor is more crucial. A regulator is essentially a feedback controlled power amplifier. The overall feedback is described by a transfer function involving the components involved.
Although no output capacitor is needed for stability, it does help transient response. Sign up using Datazheet and Password.
Russell McMahon k 9 If the feedback is negative overall the system is stable and the output is DC. Absolute maximum ratings note 1 if militaryaerospace specified devices are required, please contact the national semiconductor sales office distributors for availability and specifications.
LM340 Datasheet PDF
Tantalum offers OK cost per capability at capacitances from about 10 uF up. And one datashewt note, did you refer to the ripple voltage on the cap being large even for small currents as an inherent issue due to the small size?
Threeterminal positive dstasheet voltage regulators this family of fixed voltage regulators are monolithic integrated circuits capable of driving datasheef in excess of 1. BUT anything can happen.
Look at the output with an oscilloscope and you may see an eg kHz semi sine wave of ‘s of mV to some Volts of amplitude on a nominal 5VDC output. Tantalums were specified because Electrolytic can have their ESR increase up to 30x on very low temps. MattYoung And how long do you think that edit would last? Only slightly more complex – good Sueful – stack exchange.
LM Datasheet(PDF) – National Semiconductor (TI)
If ultra low impedance is desired then use of a smaller parallel ceramic is indicated. Home Questions Tags Users Unanswered. The characteristics of aluminum wet electrolytic capacitors of the correct capacitance and voltage rating are well suited to the output capacitor’s role. This series of devices can be used with a series—pass transistor to boost output current capability at the nominal output voltage.
Output capacitance datxsheet for stability: Higher capacitances are also stable.