Hi all,
I just need to confirm my circuit current understanding. Am I correct in thinking a 5V 2A supply, with two series 10k resistors to GND, can only supply 0.6mA from the potential divider?
I would like to supply 2.5V and the possibility to source 100mA.
Look forward to your reply.
Tuurbo46
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James Reply on EPE forum:
Hi Any current drawn from the potential divider will reduce the output voltage below 2.5V. The Thevenin Equivilent Circuit of the potential divider is a 2.5V voltage source in series with a 5k resistor. Any current drawn from the circuit drops a voltage across the output resistance. At 0.5mA drawn, the output will be right down to 0V. Use an LM317 regulator to regulate the output to 2.5V. This means you can use two same value 100R regulator output setting resistors with the LM317. Cheers James
I just need to confirm my circuit current understanding. Am I correct in thinking a 5V 2A supply, with two series 10k resistors to GND, can only supply 0.6mA from the potential divider?
I would like to supply 2.5V and the possibility to source 100mA.
Look forward to your reply.
Tuurbo46
-----------------------------------------------------------------------------------------------
James Reply on EPE forum:
Hi Any current drawn from the potential divider will reduce the output voltage below 2.5V. The Thevenin Equivilent Circuit of the potential divider is a 2.5V voltage source in series with a 5k resistor. Any current drawn from the circuit drops a voltage across the output resistance. At 0.5mA drawn, the output will be right down to 0V. Use an LM317 regulator to regulate the output to 2.5V. This means you can use two same value 100R regulator output setting resistors with the LM317. Cheers James
