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TPS82150: Generating a negative 5V from negative 15V

Part Number: TPS82150

I was planning to use two TPS82150 devices to generate +/-5V from +/-15V, and have been looking for an application note to generate negative 5V from my negative 15V rail.

I have seen the example Inverting Power Supply Schematic in Figure 30, but this doesn't work for me as +15V to -5V exceeds maximum supply voltage, and it is preferred that I use the -15V rail.

I just wondered if I was missing a simple solution?

  • Hi Giles,

    Do you have a +/-15V in and need +/-5V out? How much current do you need?

    Usually, customers would take the +15V to +5V. The negative -5V rail might be made in different ways, depending on how much current is needed.

    This FAQ describes how to connect any buck to make -5V from -15V: e2e.ti.com/.../2494.tps62110-as-negative-to-negative-buck

    Or this reference design makes -5V from +5V: www.ti.com/.../tida-01457

    Chris Glaser

    Texas Instruments

    ________________________________

    TPS62147 – New 17Vin, 2A buck with forced-PWM option for low output ripple.
    1% accuracy over temperature, 0.8V to 12Vout, pin-compatible to 4A (TPS62136), for industrial applications.

  • In reply to Chris Glaser:

    Thanks for the reply Chris.

    As you suggested, I ended up generating -5V from +5, using a TPS82150SIL and the application note in the data sheet.

    Kind regards

    Giles

  • In reply to Giles Hutchison:

    Great! Glad it worked for you.

    Chris Glaser

    Texas Instruments

    ________________________________

    TPS62147 – New 17Vin, 2A buck with forced-PWM option for low output ripple.
    1% accuracy over temperature, 0.8V to 12Vout, pin-compatible to 4A (TPS62136), for industrial applications.

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