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SC431CS-1.TRT Datasheet(PDF) 1 Page - Semtech Corporation |
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SC431CS-1.TRT Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 9 page  POWER MANAGEMENT 1 www.semtech.com SC431 Adjustable Shunt Regulator Revision: April 23, 2008 The SC431 is a three terminal adjustable shunt regulator with thermal stability guaranteed over temperature. The output voltage can be adjusted to any value from 2.5V (V REF) to 30V with two external resistors. The SC431 has a typical dynamic output impedance of 0.25 Ω. Active output circuitry provides a very sharp turn on characteristic, making the SC431 an excellent replacement for zener diodes. The SC431 shunt regulator is available with four voltage tolerances (0.5%, 1.0% and 2.0% over T A = -40°C to +85°C and 0.5% over T A = -40°C to +125°C) and two package options (SOT-23-3 and SO-8). This allows the designer the opportunity to select the optimum combination of cost and performance for their application. Linear Regulators Adjustable Supplies Switching Power Supplies Battery Operated Computers Instrumentation Computer Disk Drives Wide operating current range 130µA to 150mA Low dynamic output impedance 0.25 Ω typ. Trimmed bandgap design + 0.5% Alternate for TL1431, TL431, LM431 & AS431 Industrial temperature range Available in SOT-23-3 and SO-8 packages. Also available in Lead-free, fully WEEE and RoHS compliant. Notes: 1) Set V OUT according to the following equation: 1 R I 2 R 1 R 1 V V REF REF OUT + + = 2) Choose the value for R as follows: • The maximum limit for R should be such that the cathode current, I Z, is greater than the minimum operating current (130µA) at V IN(MIN). • The minimum limit for R should be such that I Z does not exceed 150mA under all load conditions, and the instantaneous turn-on value for I Z does not exceed 200mA. Both of the following conditions must be met: mA 200 V R (max) IN min ≥ (to limit instantaneous turn-on I Z) mA 150 I V V R (min) OUT OUT (max) IN min + − ≥ (to limit I Z under normal operating conditions) Applications Typical Application Circuit(1)(2) Features Description |
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Similar Description - SC431CS-1.TRT |
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