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TPSM828302: TPSM828302

Long Nguyen
Prodigy 20 points
Part Number: TPSM828302
Other Parts Discussed in Thread: TPSM82822A, TPSM828512

Tool/software:

Hello,

I am evaluating the TPSM828302 to provide core power to a Spartan 7 FPGA with the following requirements:

1. Vin = 4.5V to 5.5V (Within the input voltage range of this device as shown on datasheets).

2. Vout = 1.0V +/-50mV (Within the output voltage range of this device as shown on datasheets).

3. Iout = 2A maximum.

4. FPWM (CCM) Mode Only.

When I use WEBENCH Designer with the above Vin, Vout, and Iout, I get Design cannot be created. If I increase Vout to 1.1V, then WEBENCH Designer is able to create a design.

My questions:

1. For 1V output at 2A, is Ton too low for WEBENCH Designer to create a design?

2. What is the minimum Ton for this device that must be met since I can not find this on the datasheets?

3. The datasheets list a Typical Fsw = 2MHz. What are the Min and Max Values of Fsw?

4. In FPWM (CCM) Mode, is Fws fixed or varied based on Iout?

5. I find a similar device (TPSM82822A) and I am able to use WEBENCH Designer to generate a design for 1V output using this TPSM82822A device. Can you tell me the differences between TPSM828302 and TPSM82822A?

6. Any recommendation for other devices that meet my requirements above and are recommended for new design?

Thank you very much for your support.

Regard,

Long Nguyen

  • 0
    TI__Mastermind 21530 points

    Hi Long,

    The TPSM828302 is able to support 4.5V to 5.5V VIN to 1V output. This seems to be some problem with the Webench design. I shall check with the Webench team

    For the TPSM828302, I could find some validation data for output DC regulation vs load current for 4.5V (red) and 5.5V (green) inputs and 0.9V output. 

     

    The switching frequency for this part is variable in FPWM mode as well because of the DCS topology. It won't be possible to give you min/max values for the switching frequency. The layout of your PCB and ESL/ESR of your output caps also have an influence on the frequency.

    If you would like to have a device with a constant switching frequency I would recommend the TPSM828512 module. This uses a different control topology and the switching frequency for this device is fixed.

    Best regards,

    Varun