DC to DC Converter Problem

[Good Brown Gravy]

Hi Guys,

I just ordered a DC to DC converter for a project I'm working on. I'm looking to power the positive and negative rails of an audio amplifier. I found on amplifier that I can feed 5 volts to and then get out + and -15 volts. The problem is I can't get the chip to work at all. I bought two of them and neither will give me anything close to the voltage out. In fact, I will feed 5 volts to the chips and then in a second or two it'll just starting pulling a lot of current so that my limiter steps in.

The chip I am using is this:

**broken link removed**

I am feeding it ground and power and that is it. I know I'm missing something but I don't know what it is. The datasheet looks really simple, but I'm at a loss.

Thanks for any help,
Jason

 

[HMS1021]

Is it the DCV010515D that you have? I think it is because the output is +/- 15Vdc and the input voltage range is +5Vdc per specification on page 2.

The maximum load is 1 watt which is 33 ma each for the +15Vdc and -15Vdc outputs therefore the loads are <454 ohms.

Input +5Vdc to Vs (pin1), GND to V0 (pin2)
The sync pins 8 and 14 are not connected to anything.

- - - Updated - - -

PS

Pins 2 and 5 are not connected internally even though they are both labeled 0V. Psupply in is on 1 & 2 and Pout on 6 & 7 referenced to pin 5.

Pins 2 and 5 can be connected externally depending on your needs.

 

[Good Brown Gravy]

You are reading it exactly like I read it. Just to make sure I was doing things right, I took my source and just plugged +5V into pin 1 and then plugged GND into pin 2. Then I measured the voltage between pins 5 and 6. I read just a couple hundred mV. The readings from pin 5 and 7 was around -2V. After my readings I noticed that the current being drawn started to increase and then the chip started to get hot, so I pulled the power. This happened with both chips that I ordered. I'm not sure what's going on.

 

[HMS1021]

Sometimes it is the simple parts that cause the most trouble.

Ah, if the internal feedback is current, and magnetically coupled, then it would be very unhappy without a suitable load. Have you tried it with a couple of ~500 ohm resistors on the two outputs?