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TAS5624A Fault故障

Other Parts Discussed in Thread: TAS5624A

TAS5624A, 24v供电,1*BTL+2*SE,空载

板子之前没问题,后将SE某一通道的电感换成饱和电流更小的电感,然后上电Fault 电平就拉低,也发现OTW 也会短暂拉低。(见图1,黄色OTW,绿色Fault)

作如下测试:

1. 下电测试,未发现功放输出管脚对地、电源短路,管脚间也无短路现象;

2.PVDD 15v供电,OTW 指示灯亮一段时间后熄灭,随后Fault指示灯点亮。见图2

    疑问: TAS5624A  什么原因导致Fault?  空载加各种电压均正常,唯一能解释的是芯片坏了。

FAULT OTW DESCRIPTION
0 0 Overtemperature (OTE) or overload (OLP) or undervoltage (UVP)
0 1 Overload (OLP) or undervoltage (UVP)
1 0 Junction temperature higher than 125°C (overtemperature warning)
1 1 Junction temperature lower than 125°C and no OLP or UVP faults (normal operation)

  

图1

图2