I'm trying to build a DC-DC split-rail converter using circuit from this article:

My goal is to split 12..14V input voltage into +2.4V and -2.4V. To do that, I use LM1501AGR-ADJ IC, which allows to get output voltage from 1.23V to 37V. The circuit from its datasheet looks like that:

I calculated the needed inductance value (15 uH) and made the coupled inductor, and then built the following circuit:

Unfortunately, it does not work. When I apply input voltage (12V), Vout- is about -11V, and Vout+ is -0.2V. Adjusting R1 affects only on Vout- - it's minimum value that I was able to obtain is -5.0V. Vout+ does not change at all. All measurements were made without any load.

Is this even possible to make such converter? I tried to build something like this using LM317 and LM337, but it heats too much @2A output current.

UPD: I have tried to add a 1K load resistors for both Vout+ and `Vout- outputs - nothing changed. I use SB560 diodes - maybe they are not good choise?

I'm trying to build a DC-DC split-rail converter using circuit from this article. My goal is to split 12..14V input voltage into +2.4V and -2.4V. To do that, I choosed LM1501AGR-ADJ IC, calculated the needed inductance value (15 uH) and made the coupled inductor, then built the following circuit:

It works OK, but only when I apply a certain load. When the load is 1K or more, Vout- is about -11V, and Vout+ is -0.2V (input voltage is 12V). Load resistance of 220R or less makes Vout- equal to -2.39V, and Vout+ to 2.36V, which is just fine for my purposes.

I don't like the fact that circuit needs some "dummy" load to work correctly, because it means aditional power consumption. I'm gonna use battery as the power supply, so I whant it to consume as less power as possible. Besides, it looks like a very quick'n'dirty solution. Are there better ways to solve this problem?

To provide some additional information about the circuit, I tried to obtain the inductor's currents waveforms. To do that, I removed C2 and C3 and applied the load resistors 10R, than measured the voltage waveform on them. Here is what I got:

Primary coil

Primary coil - large scale

Secondary coil

By primary coil I mean the coil which is connected directly to IC.

I'm trying to build a DC-DC split-rail converter using circuit from this article:

My goal is to split 12..14V input voltage into +2.4V and -2.4V. To do that, I use LM1501AGR-ADJ IC, which allows to get output voltage from 1.23V to 37V. The circuit from its datasheet looks like that:

I calculated the needed inductance value (15 uH) and made the coupled inductor, and then built the following circuit:

Unfortunately, it does not work. When I apply input voltage (12V), Vout- is about -11V, and Vout+ is -0.2V. Adjusting R1 affects only on Vout- - it's minimum value that I was able to obtain is -5.0V. Vout+ does not change at all. All measurements were made without any load.

Is this even possible to make such converter? I tried to build something like this using LM317 and LM337, but it heats too much @2A output current.

I'm trying to build a DC-DC split-rail converter using circuit from this article:

My goal is to split 12..14V input voltage into +2.4V and -2.4V. To do that, I use LM1501AGR-ADJ IC, which allows to get output voltage from 1.23V to 37V. The circuit from its datasheet looks like that:

I calculated the needed inductance value (15 uH) and made the coupled inductor, and then built the following circuit:

Unfortunately, it does not work. When I apply input voltage (12V), Vout- is about -11V, and Vout+ is -0.2V. Adjusting R1 affects only on Vout- - it's minimum value that I was able to obtain is -5.0V. Vout+ does not change at all. All measurements were made without any load.

Is this even possible to make such converter? I tried to build something like this using LM317 and LM337, but it heats too much @2A output current.

UPD: I have tried to add a 1K load resistors for both Vout+ and `Vout- outputs - nothing changed. I use SB560 diodes - maybe they are not good choise?