TPS65185EVM: Design file of TPS65185EVM

Vinnie Gupta

Part Number: TPS65185EVM
Other Parts Discussed in Thread: TPS65185

Dear TI team,

Request you to please share design file/Gerbers of TPS65185EVM for reference.

Secondly, I want to know if it is possible to connect two TPS65185 IC in parallel to increase the output current in the circuit. As TPS651851 is currently not available, I am trying to find alternate way.

over 2 years ago

0 Gerard Copeland over 2 years ago

TI__Genius 10460 points

Hi,

Please find the Gerbers attached:

PS65185_EVM_Gerber_Manufac.zip

The TPS651851 offers higher currents on the LDOs and charge pumps.

Which are you trying to connect in parallel?
What is your required output current(s)?

Thanks,

Gerard

0 Vinnie Gupta over 2 years ago

Prodigy 20 points

Hi Gerard,

Thank you for the design file.

We are connecting EPD and required current is approx 150mA-160mA.

Regards,

Vinnie

0 Gerard Copeland over 2 years ago in reply to Vinnie Gupta

TI__Genius 10460 points

Hi Vinnie,

Which regulator output would require this 150mA-160mA current?

Thanks,

Gerard

0 Vinnie Gupta over 2 years ago in reply to Gerard Copeland

Prodigy 20 points

Hi Gerard,

TPS will provide supply to e-paper display.

Maybe I did not understand your question properly.

Regards,

Vinnie

0 Gerard Copeland over 2 years ago in reply to Vinnie Gupta

TI__Genius 10460 points

Hi Vinnie,

The TPS65185 has 4 regulator outputs for driving the e-paper display - 2 charge pumps and 2 LDOs. Based on the 150-160 mA requirement I assume the LDOs will be used to supply these rails. Is that correct?

Thanks,

Gerard

0 Vinnie Gupta over 2 years ago in reply to Gerard Copeland

Prodigy 20 points

Hi Gerard,

That's right. See below.

1. LDO1 (15V): ~150mA

2. LDO2 (-15V): ~90mA

3. CP1 (27V): 6.6mA

4. CP2 (-20V): 6.6mA

and IDD requirement at 3.3V Vdd is 4.2mA.

For TPS65185, LDO1 is rated to supply current upto 120mA. Hence, need help to increase current capacity of LDO1.

Regards,

Vinnie

+1 Gerard Copeland over 2 years ago in reply to Vinnie Gupta

TI__Genius 10460 points

Hi Vinnie,

Thanks for providing the additional details.

Since the LDOs on this device do not have an accessible FB pin, the only way to potentially parallel two LDO1 outputs is to use ballast resistors. This reference design shows an example with a different LDO: https://www.ti.com/tool/TIDA-01232

Please note the TPS65185 has not been tested or characterized for use in this kind of application. There is no guarantee the resulting performance will match the datasheet parameters. As such TI's recommendation to achieve the required 150 mA would be the usage of the TPS651851 device.

If this is not possible due to material availability, you are welcome to evaluate the parallel output approach with EVMs connected in parallel and discrete ballast resistors. Validate the performance across your application's expected range of operating conditions (Vin, Iout, ambient temperature, load transients, etc).

Thanks,

Gerard

0 Vinnie Gupta over 2 years ago in reply to Gerard Copeland

Prodigy 20 points

Thanks, Gerard. I will go through the link and try to evaluate. That helps.

Regards,

Vinnie

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TPS65185EVM: Design file of TPS65185EVM