Hello ST Community,
I'm working on a project that uses the VNQ9025AJ, a quad-channel high-side driver, to manage the power supply in a car—primarily for powering fans and pumps. We are using 12V as VCC.
According to the datasheet, each channel supports up to 30A and includes thermal protection at 150°C. However, when we integrated it into our car and attempted to power all the fans and pumps simultaneously, the driver overheated (reaching up to 200°C) and burned out. This is unexpected because the fans and pumps are relatively small, each consuming only around 3A.
I'm unsure why this is happening. I'll attach the project schematic below for reference. Any insights would be greatly appreciated!
Hi,
you get it wrong: 30A is the short current protection limit !
The driver is more for lamps, in the 2 A range (25W), that might have high inrush currents, this it survives.
see ds , typical use: ...2A...
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How good is your cooling? center pad soldered ? ...to what ? how big is copper area ?
see ds:
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fans and pumps are inductive loads - so you have freewheeling diodes there ?
