TPS54331: Overcurrent Protection when the output is shorted

Swetha Samay

Part Number: TPS54331

Is there a way to limit the current draw for TPS54331 when the output is shorted? It causes a bias tee inductor to blow up when the output is shorted due to overcurrent. Can it be solved by by lowering the switching frequency? If so, how do do it?

over 4 years ago

0 Shawn Nie over 4 years ago

TI__Genius 10070 points

Hi,

There is current limit for this device, but the value can't be changed. What is the saturation current of the inductor? Could you please share the schematic and layout?

BR,

Shawn

0 Swetha Samay over 4 years ago in reply to Shawn Nie

Prodigy 210 points

The inductor is 1008CS-751XJLC (Maximum DC Current: 360 mA). When RF + DC port in the schematic is shorted to ground, L2 (bias tee inductor) blows up. U4 is the TPS54331 chip, wondering if any changes in the circuit would help limit the current draw in case of shorting the output. Please let me know.

Thanks,

Swetha

0 Shawn Nie over 4 years ago in reply to Swetha Samay

TI__Genius 10070 points

Hi,

The IC only can limit the peak current of L1 when the output is shorted, you'd better to change an inductor whose DC rated current is larger.

Shawn

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TPS54331: Overcurrent Protection when the output is shorted