Hi all,
I really need some help here.
In the attached .GIF file is a schematic of my set-up to power several ICs in my system (an inverter) by using different linear voltage regulators all connected to a 24V dc source (in reality, this will come from a car battery). There are seven 15V regulators, one 6V and three 5V ones.
The trouble is this: The simulation works fine on ISIS, but when I cabled this stuff, it just won't work. My DC voltage supply was set at 24Vdc and always limits its output current at 3amps. When I switched on the set-up, the voltage of the DC supply went down to zero meaning the output current is higher than 3amps. How can this be when the regulators are not loaded?
I thought the input voltage was too high so I verified the data book and it's ok. Seems all L78xx regulators of the 5V-24V range can handle input voltages upto 35Vdc.
I appreciate your help in advance
I really need some help here.
In the attached .GIF file is a schematic of my set-up to power several ICs in my system (an inverter) by using different linear voltage regulators all connected to a 24V dc source (in reality, this will come from a car battery). There are seven 15V regulators, one 6V and three 5V ones.
The trouble is this: The simulation works fine on ISIS, but when I cabled this stuff, it just won't work. My DC voltage supply was set at 24Vdc and always limits its output current at 3amps. When I switched on the set-up, the voltage of the DC supply went down to zero meaning the output current is higher than 3amps. How can this be when the regulators are not loaded?
I thought the input voltage was too high so I verified the data book and it's ok. Seems all L78xx regulators of the 5V-24V range can handle input voltages upto 35Vdc.
I appreciate your help in advance