TPA3118D2: The chip crashes after power-on in some uint

?? ?

Part Number: TPA3118D2

Hi TI engineer：

Our products have a small number of boot crashes in the process of customer use . But it didn't happen during production and testing, and more than 2,000 units of the product have been produced .

Here are some of our relevant parameters ：

power supplier：+24V Adapter
load：8 ohm
VC is from 24V，Series a diode and ground 100uF capacitor

question：

the SDZ ：What is the minimum time delay required for SDZ to be enabled during the power-on process？
RINP/RINN: At the moment of power-on, there will be a pulse signal of about +12V in the signal input. Will this pulse signal cause input overload? So the chip crashes and burns?
if the SDZ always high， when power on ，Will the chip crash?

2 年多前

0 Kailyn Chen 2 年多前

TI__Guru**** 295050 points

您好，这里是中文论坛，我们可以直接中文沟通。

?? ? 说：
the SDZ ：What is the minimum time delay required for SDZ to be enabled during the power-on process？

datasheet中没有给出具体的上电时序要求，通常来说，SDZ保持为低，直到电压起来稳定之后再将SDZ拉高。从上电开始到上电完成，SDZ拉低应该要ms级的时间。

?? ? 说：
RINP/RINN: At the moment of power-on, there will be a pulse signal of about +12V in the signal input. Will this pulse signal cause input overload? So the chip crashes and burns?

上电开始，最好保证输出高阻态，不建议给输入信号。就像上述所说，直到电压起来完全稳定之后再将SDZ拉高，然后再给输入信号。

上电还没完全完成的话，供电还处于欠压状态。

?? ? 说：
if the SDZ always high， when power on ，Will the chip crash?

SDZ一直为high，也就是TPA3118D2 一直处于使能输出，要保证上电期间输出一直高阻态，如果SDZ一直为high，很有可能是上电导致芯片损坏的原因。

我的建议是按照我上面说的上电时序，再验证下，通过您目前的描述，我认为芯片上电损坏不排除这个原因。

音频

音频论坛

TPA3118D2: The chip crashes after power-on in some uint