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Original question:

TPA3255EVM: Only measured 300W mono for TPA3255EVM

TPA3255EVM: CLIP_OTW pin goes low when Vin = 1.5 Vrms ( Vpeak = 2.125 V ), Sine wave with frequency 1kHz, 4 ohms resistor load

Naiwen Chang
Prodigy 150 points
Part Number: TPA3255EVM
Other Parts Discussed in Thread: TPA3255

Tool/software:

Hi TI team,

According to datasheet, TPA3225 Vin absolute rating is +/-3.5V.

I use TPA3255 EVM with Vin = 1.5 Vrms ( Vpeak = 2.125 V ), Sine wave with frequency 1kHz, 4 ohms resistor load

and CLIP_OTW pin always goes low which means junction temperature higher than 125°C (overtemperature warning). Fault pin always goes high which is normal.

Below is my experiment setup

Function generator Vin

Vout at 4 ohm load ( use single to catch the waveform to avoid from damage)

Follow the userguide PBTL output:

• Set J6 to H and J5 to L

• Connect speaker/power resistor (2–4 Ω) positive terminal to OUTA and OUTC (OUT A and C shorted).

• Connect speaker/power resistor (2–4 Ω) negative terminal to OUTB and OUTD (OUT B and D shorted).

• Install PBTL jumpers J7 and J8 (pulls input C and input D to GND).

• For single-ended mono input, connect RCA male jack to female RCA jack input A/AB (RED) and set J4 jumper positions to SE.

Thanks~

  • 0
    TI__Genius 9195 points

    HI Naiwen,

    Are you able to send me scope shots of the CLIP_OTW pin and the differential output? The differential output can be done by probing the two differential outputs then subtracting them on the scope.

    From the scope shot you sent, it looks like you are getting over 270W of output power and putting it into a 100W resistor. I would recommend to use a higher power resistor if you are testing. It is entirely possible that the junction temperature is at the OTW. 

    Regards,

    Ramsey