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TPS65185: Max Current

Mitchell
Expert 4915 points
Part Number: TPS65185

Hi Team,

In the data sheet it shows for current capability for the TPS65185:

TPS651851

3V Max (mA)

3V6 Max (mA)

VGH CP1

15

Max

VGL CP2

15

Max

VPOS LDO1

150

200

Max

VNEG LDO2

120

200

Max

VCOM

15

Typical


If my customer performs some screen blanking and writes a complex 1-bit dithered image to their display they get #s such as:

max(mA)

min(mA)

RMS(mA)

Waveform No.

VGH

30.8

NA

3.86

35

VGL

12

- 34.4

4.6

36

VPOS

30

- 8

6.6

37

VNEG

16

- 150

39.9

38

VCOM

58.8

-17.2

4.12

39


These peaks exceed the data sheet, but the RMS # is in line with the data sheet. Can you help me understand if they are in violation?

Thanks,
Mitchell

  • 0
    TI__Genius 10490 points

    Hi Mitchell,

    To clarify, the limits you have posted are for the TPS651851, not the TPS65185. Please also keep in mind that these devices are designed to power E-Ink Vizplex display screens up to a maximum of 9.7 inches. 

    It is not recommended to exceed the maximum rated current, even instantaneously. VGH CP1 and VCOM are not designed to supply more than 15 mA, meaning that:

    • The device is not tested or characterized for operation with these currents, so performance could differ from the datasheet specifications. 
    • The heat generated by these currents can degrade the reliability and longevity of the device.

    These are even more of a concern if the application frequently requires writing these complex images. Is this the case for your customer? Are you able to share scope shots of these load currents during the complex writes, either on this post or through private message? Just the loads for VGH and VCOM would be enough. 

    Thanks,

    Gerard