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LM432AN3 Datasheet(PDF) 1 Page - Cystech Electonics Corp. |
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LM432AN3 Datasheet(HTML) 1 Page - Cystech Electonics Corp. |
1 / 9 page CYStech Electronics Corp. Spec. No. : C504N3 Issued Date : 2003.03.21 Revised Date : 2005.10.07 Page No. : 1/9 LM432XA3/N3 CYStek Product Specification Adjustable shunt regulator LM432XA3/N3 Description Features The LM432 is a three terminal adjustable shunt ◆ Low voltage operation(down to 1.24V) regulator with thermal stability guaranteed over ◆ Wide operating current range 80μA to 100mA temperature. The output voltage can be adjusted ◆ Low dynamic output impedance 0.05Ω typ. to any value from 1.24V(VREF) to 20V with two ◆ Trimmed bandgap design ±0.25% external resistors. The LM432 has a typical dynamic ◆ Upgrade for LM431 output impedance of 0.05Ω. Active output circuitry ◆ Available in TO-92 and SOT-23 packages provides a very sharp turn on characteristic, making the LM432 an excellent replacement for zener diodes. Applications The LM432 shunt regulator is available with four ◆ Linear Regulators voltage tolerances(0.25%,0.5%,1% and 2%), and two ◆ Adjustable Supplies package options(TO-92 and SOT-23). This allows the ◆ Switching Power Supplies designer the opportunity to select the optimum combi- ◆ Battery Operated Computers nation of cost and performance for their application. ◆ Instrumentation ◆ Computer Disk Drives Typical Application Circuit(Note 1,2) Notes: 1) Set VOUT according to the following equation: VOUT=VREF(1+R1/R2)+IREFR1 2) Choose the value for R as follows: ˙The maximum limit for R should be such that the cathode current, Iz, is greater than the minimum operating current(80μA) at VIN(MIN). ˙The minimum limit for R should be as such that Iz does not exceed 100mA under all load conditions, and the instantaneous turn-on value for Iz does not exceed 150mA. Both of the following conditions must be met: Rmin ≥VIN(max)/150mA(to limit instantaneous turn-on Iz) Rmin ≥ VIN(max)-VOUT (to limit Iz under IOUT(min)+100mA normal operating conditions) VIN GND R R1 R2 VREF PL432 VOUT LM432 |
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