LM2594 whether can do Vin=12 Vout= -12V

Vincent Hsieh

Expert 1895 points

Other Parts Discussed in Thread: LM2594

Dear Sir,

LM2594 whether can do Vin=12 Vout= -12V

over 9 years ago

0 YangZhang over 9 years ago

TI__Genius 11085 points

For 12V input to -12V output, you need an IC with VIN rating >24V. The LM2594 should be able to do it. Note that with the inverting configuration, it cannot supply the same amount of load current as when it is configed as a buck converter. For 12V to -12V, ideally it can supply 250mA. Given the losses etc., I'd say it is safe to supply upto 200mA load current.

-Yang

0 Vincent Hsieh over 9 years ago in reply to YangZhang

Expert 1895 points

Dear Sir,

Thanks, have any reference design for this case?

0 Akshay Mehta over 9 years ago in reply to Vincent Hsieh

TI__Genius 15810 points

Hello,
I don't believe there's a reference design for this part. But here is an app note: www.ti.com/.../snva010d.pdf
If you don't use a coupled inductor and use a regular inductor then you can get the negative output.
Regards,
Akshay

0 Frank De Stasi over 9 years ago in reply to Akshay Mehta

TI__Guru 73115 points

Also, look at the LM2594, 95, 98 data sheets for an example of an inverting regulator. You may be able to use this as a starting point.

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LM2594 whether can do Vin=12 Vout= -12V