The LM is a 3-terminal adjustable shunt regulator with guaranteed temperature stability over the entire tempera- ture range of operation The output voltage. LM Adjustable Precision Zener Shunt Regulator An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in. View LM Datasheet datasheet from Texas Instruments at Digikey.

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National Semiconductor

Ratings apply to ambient temperature at 25? The dynamic output impedance, r Zis defined as: Deviation of Reference Input Voltage Over. Here Ic is the current drawn by the transistor.

Test Circuit for Off-State Current.

National Semiconductor – datasheet pdf

Deviation of reference input voltage, V Datwsheetis defined as the maximum variation of the reference input voltage over the full temperature range. National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.

Due to the sharp turn-on characteristics this device is an excellent replacement for many zener diode applications. Output Control of a Three. Also Vref is the voltage at the midpoint voltage divider network formed by the two resistors R2 and R3. Deviation of Reference Input Current datashret. Minimum Cathode Current for Regulation.


Before going for application circuit of LMlet us first understand the internal working of the device and for that consider the functional diagram dwtasheet the device as shown below. LM can be configured in many application circuits and a few are stated in the datasheet.

Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.

A critical component is any component of a life. Also the current draw by op-amp and resistor network is neglected for easy explanation. Must be electrically isolated from the. Test Circuit for Curve A Above.

Single Supply Comparator with. Absolute Maximum Ratings Note 2. So in the final result Vo will always be adjusted to float near the measured value by op-amp setup or LM TL — Programmable Reference Voltage. C unless otherwise specified. C, datasheef is positive. C, the SO-8 at 6. To ensure that the geometry of the micro SMD package. V Z from 10V to 36V.

Now let us consider a simple application circuit for the device as shown below: It is l431 3-terminal shunt regulator with guaranteed temperature stability over the entire temperature range of operation.

The output voltage may be set at any level. Wave Soldering 10 sec. The areas under the curves represent conditions that may cause the device to oscillate. Whenever the output crosses threshold threshold is value determined by R2 and R3 value the op-amp get feedback via Vref and it drives the transistor ON. Ratio of the Change in Reference Voltage.


C, the SOT at 2. Dynamic Impedance vs Frequency. Above this temperature, derate the TO at 6. The output voltage may be set at any level greater than 2. Distributors for availability and specifications. Current Limiter or Current Source.

LM Datasheet(PDF) – National Semiconductor (TI)

When the transistor turns ON the device draws current and because of this current drawing a voltage drop appears across R1 resistor which is in series with voltage source V1. Input Current vs V Z. AN for more detailed information regarding board. Electrical specifications do not apply when datasheer the device. The LM is a 3-terminal adjustable shunt regulator with. Dynamic Output Impedance Note 6.

When the device is programmed with two external resistors, R1 and R2, see Figure 2the dynamic output impedance of the overall circuit, r Zis defined as: Life support devices or systems are devices or. In a similar way we can setup other application circuits. Here reference voltage Vref is the voltage at the non-inverting terminal l,431 the op-amp and this voltage determines whether the op-amp outputs positive voltage or not. Higher Current Shunt Regulator.