Lm2576 Constant Current. In this blog entry i describe a constant current lm2576 power supply. Hi i m trying to build an adjustable constant current constant voltage power supply using a lm2576.
Below is a picture of the supply mounted into a section of aluminum square tubing. The lm2576 series of regulators are monolithic integrated circuits that provide all the active functions for a step down buck switching regulator capable of driving 3 a load with excellent line and load regulation. Posted here is the schematic of it.
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These devices are available in fixed output voltages of 3 3 v 5 v 12 v 15 v and an adjustable output version. I preferably want to use a op amp which will work on a single supply like a lm358. External shutdown is included featuring 80 a typical standby current. The lm2576 features include a guaranteed 4 tolerance on output voltage within specified input voltages and output load conditions and 10 on the oscillator frequency 2 over 0 c to 125 c.
