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LX6431ILP Datasheet(PDF) 7 Page - Microsemi Corporation |
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LX6431ILP Datasheet(HTML) 7 Page - Microsemi Corporation |
7 / 11 page P RECISION P ROGRAMMABLE R EFERENCE S LX6431/LX6431A/LX6431B PRODUCT DA T ABOOK 1996/1997 7 Copyright © 1999 Rev. 1.4a P RODUCTION D AT A S HEET The output voltage of the reference can be programmed by using the formula below: If more accuracy is required then the effects of the input bias current (I REF) must be taken into account. The formula below accounts for the error this current produces. Smaller values of programming resistors tend to minimize bias current errors. In this respect the low input current characteristics of the LX6431B helps to reduce the power dissipation on the programming resistors by a factor of five compared to other references like the TL1431 and TL431. The LX6431 series of voltage references have an enhanced circuit design that can tolerate any value of cathode to anode capacitance. APPLICA TION INFORMA TION Application Hints The reference input current of the LX6431 series voltage refer- ences is much lower than other similar precision parts. This helps to design programmable voltage references that can use much higher value programming resistors while maintaining the same accuracy as the other precision parts. Figure 7 below shows a 5V, 1% shunt regulator using the LX6431B and a shunt regulator using the TL1431 (Also available from Linfinity). Figure 8 shows 0.5% shunt regulators. Noteworthy are the values of the reference resistors used in the two circuits. With the LX6431B it is possible to use 25k resistors for setting the output voltage with 1% precision as opposed to 5k programming resistors when the same precision needs to be achieved with a TL1431. LX6431B 1k 0.1% 1k 0.1% R1 R2 GND a) V KA 5V, 0.5% V IN FIGURE 8 — Comparison of reference resistor values between an LX6431B and a TL1431, when used as 0.5%, 5V shunt regulators. TL1431 240 0.1% 240 0.1% R1 R2 GND b) V KA 5V, 0.5% V IN V2.5 1 R1 R2 IR1 KA REF =∗ + +∗ V2.5 1 R1 R2 KA ≅∗ + LX6431B 25k 0.1% 25k 0.1% R1 R2 GND a) V KA 5V, 1% V IN TL1431 5k 0.1% 5k 0.1% R1 R2 GND b) V KA 5V, 1% V IN FIGURE 7 — Comparison of reference resistor values between an LX6431B and an TL1431, resistors used with the LX6431B are 5 times higher in value. |
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