LM723 Voltage Regulator, Regulation Question
LM723 Voltage Regulator, Regulation Question
(OP)
I have a circuit design, where I am using a LM723 Voltage regulator to give me 12VDC. If I understand correctly the LM723 can supply 150ma without an external transistor. However, I have a load connected to it that is varriable, and the current draw will range from 40 to 50ma. I notice that when I reach 50ma. That I will see appromimately .3V drop in my 12V signal. Is this normal? or do I have a problem?
Thanks
Thanks





RE: LM723 Voltage Regulator, Regulation Question
The amount of current the regulator will deliver (power it will source / dissipate) depends on its temperature. I am not familiar with the LM723 but I have found with the LM317 (rated for 1A) that when it sources around 200mA it gets pretty hot and then the 12V out will slow drop. The thermal shutdown inside the regulator kicks in to turn the device off.
If you blow on the device (to remove heat) and the voltage picks back up that is a sign you need a heatsink and maybe even a fan to get full current rating.
RE: LM723 Voltage Regulator, Regulation Question
what is the input voltage.
What is the value of Rsc.
If Rsc is 10 ohms like the app.note has
you maybe in current limit at 50mA.
Try lowering the current sense resister.
RE: LM723 Voltage Regulator, Regulation Question
RE: LM723 Voltage Regulator, Regulation Question
RE: LM723 Voltage Regulator, Regulation Question
RE: LM723 Voltage Regulator, Regulation Question
RE: LM723 Voltage Regulator, Regulation Question
RE: LM723 Voltage Regulator, Regulation Question
RE: LM723 Voltage Regulator, Regulation Question
One of the power supplies that I reviewed was the Power-One supplies that digikey sells
RE: LM723 Voltage Regulator, Regulation Question
RE: LM723 Voltage Regulator, Regulation Question