High power adjustable regulated power supply using TL431

Published:2011/8/1 2:44:00 Author:Ecco | Keyword: High power , adjustable , regulated power supply | From:SeekIC

Precision voltage reference ICTL431 is T0-92 packaged, it is shown in Figure 1. Its performance is continuously adjustable output voltage being up to 36V, wide operating current range is 0.1. 100mA, the typical dynamic resistor is 0.22Ω, the output clutter is low. Figure 2 is a typical application of TL431, of which both ends of the output voltage of ③, ② feet V is 2.5 (R2 ten R3) V/R3. If you change the size of the resistance of R2, you can change the output voltage. Figure 3 uses it as external voltage reference and to drive the regulator FET K790, which makes output currentbe about 6A, the circuit is simple with safe power supply.The working principle As Figure 3 shown, 220v voltage is stepped-down by the transformer B, rectified by D1-D4, filtered by C1. In addition, D5, D6, C2, C3 form double voltage circuit(making Vdc = 60V), Rw, R3 form voltage divider, T1431, R1 form sampling amplifier, 9013, R2 form limiting protection circuit, K790 FET tube is adjusting tube (which can be directly used in parallel), and C5 is the output filter circuit.



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