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TPA3255 safe maximum PVDD Voltage

Thorsten Loesch
Prodigy 190 points
Other Parts Discussed in Thread: TPA3255

Looking at the datasheet, and checking threads here, there seems to be conflicting information.

1) "The TPA3255 has a maximum voltage of 51.5V"   (source - click image) 

2) PVDD_X to GND max  69 (Datasheet Absolute Maximum Ratings)
3) PVDD_X / RL ≥ 6Ω (1) 18 53.5 56.5 (min/nom/max - Recommended Operating Conditions)
4) PVDD is shown up to 57V in (for example) Figure 7. Output Power vs Supply Voltage (Typical Characteristics)

So, presuming >= 6R Load per BTL Channel (or equivalent), BTL only operation (not SE) and sufficient heatsinking what are:

A) Maximum permissible PVDD without Signal
B) Maximum permissible PVDD with low power Signals (e.g. < 10W equivalent RMS Power)
C) Maximum permissible PVDD with AES2-1984 (ANSI S4.26-1984) Test Signals (Pink noise, 6 dB Crest Factor)

Thank you for clarifying.

  • 0
    TI__Genius 9175 points
    Hello,

    The datasheet for the TPA3255 was just released with final voltage specifications.

    1. Typical PVDD voltage for the TPA3255 is 51V for 4R load and 53.5V for >6R load. The max specification of 53.5V and 56.5V is the maximum permissible supply voltage during operation, including supply ripple voltage at full rated output power.

    2. PVDD_X to GND max of 69V is the limit for immediate device damage regardless of the amplifiers state.

    3. Although figure 7 does show up to 57V, it is not a recommended condition.

    To answer your questions:
    A) B) C) are the same, 56.5V. However this incudes any ripple in the supply. Therefore, if you choose a DC voltage of 56.5V, there can be zero ripple voltage at maximum output power.

    Best Regards,
    Matt
  • 0 in reply to Matthew Beardsworth
    Prodigy 190 points

    Dear Matt,

    Thank you, that makes it 100% crystal clear.

    Kind regards T