DRV8320: 模拟高边MOS短路芯片静态电流异常发热严重-TI中文支持网

Part Number:DRV8320

42V supplies power to 8320H. When DRV8320H simulates a high side MOS short circuit on the upper tube, it triggers the hort circuit protection and 8320H enters nsleep mode.

At this time, most of the functions of the driver IC have been disabled, but the actual static current has increased by nearly 50mA.

The measured current entering the driver IC from SHX is 17.7mA (connected in series to the SHX circuit using a multimeter). SHA, SHB, and SHC correspond to a total current of 17.7mA × 3 = 53.1mA.

However, reading the specification did not find a circuit that can generate this current. If the VM continues to short SHX, the driver IC will heat up to 130 ℃. What is the mechanism behind this phenomenon?

Cherry Zhou：

Hi，

您的问题我们已升级到英文论坛寻求帮助。由于这一周为感恩节假期，给到您答复的时间可能会有所延迟，给您带来的不便敬请谅解。

Thanks

,

Cherry Zhou：

Hi,

请参阅如下答复：

Are you having one of the MOSFETs getting shorted? Or are you turning on the HS gate connecting VM to SHx? Or is VM and HX pin shorted on the IC? A little lost so would appreciate some clarity.

A short can case excessive current draw so if accidental short is occurring then that needs to be fixed.

Please check the following FAQ section 1 and 3 for help in resolving this.

https://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1176539/faq-quick-guide-to-debugging-common-issues-in-bldc-motor-drivers

Thanks

DRV8320: 模拟高边MOS短路芯片静态电流异常发热严重

Cherry Zhou：

Cherry Zhou：

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