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TX 517 EVM Power Supplies - # of external supplies, max. slew rate

Oliver Werther
Prodigy 40 points
Other Parts Discussed in Thread: TX517

In a previous post it was confirmed that the voltages HV1, LV1, HV0, LV0, HV2, LV2 + VDD, VEE, VCM must be supplied externally to the evaluation kit.

In addition the datasheet states
- the max power supply slew rate should be 10V/ms (page 9)
- the external supplies need to be sequenced according to table 4, page 14
power up
1) Driver supplies
2) LV1,
3) HV1,
4) LV2, LV0, HV0, HV2, VCW

and the reverse for power down

According to the user manual for the EVM, the user of the eval kit has to externally supply the following 10 voltages:

VDD = 5V
VEE - 5V
HV0 = +1.9V
LV0 = -1.9V
VCW = 11V
VAA = 2.5V
HV1 = 61V
LV1 = -20.9V
HV2 = 32V
LV2 = -11.9V

The EVM only generates
- 3.3V using the TPS79633DCQR
- 1.2V using the TPS73201QDBV

So my questions are
1) The user has to apply 11 external voltages to get the EVM kit functional?
a) 5V supply for the EvalKit
b) 10 Voltages VDD, VEE, VCW, VAA and HVx, LVx

2) What are the consequences (for the TX517) if the power supplies used exceed the max. power supply slew rate requirement of 10V/ms as specified for the TX517 ?

thank you
Oliver

  • 0
    TI__Mastermind 18275 points

    Oliver,

    Thank you for your interest in the TX517. I am assigning your post to the correct applications engineer. He should respond soon.

  • 0
    TI__Expert 6320 points

    Oliver,

    In general, yes, they are all required for full functionality of the device.  If CW mode is not used, then VCW is not required.  HV0 and LV0 are used for damping the output at low voltages, so it only helps the performance.  To get 17 levels, then two channels of 5-level output are required.  You can simply use the HV1/LV1 and HV2/LV2 as required for your application and also scale the voltages to your application. The driver voltages are always required.

    Thanks,

    Chuck Smyth

  • 0 in reply to Chuck Smyth
    Prodigy 40 points
    Chuck,
    thank you. Could you also comment on what happens if the specified power supply slew rate of 10V/ms will be exceeded?

    What is the resaon that TI decided not include at least a few on board "power supplies" or regulators so that customers would not need that many external supplies for this evaluation kit?

    thanks
    Oliver
  • 0 in reply to Oliver Werther
    Expert 1705 points
    I'm also wondering why we need so many external supplies to this evaluation kit.