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TPS61183: Could NMOS in TPS61183 survive under the stress of 3~4A 20us current pulse

Part Number: TPS61183

The stress is 20us, and peak value is 3~4A. It is a singel pulse.

Customer is asking about that.

Could you please help check this?

  • Hi Robin
    There is OCP description on datasheet as below:

    “The TPS61183 has a pulse-by-pulse over-current limit of 2 A (minimum). The PWM switch turns off when the inductor current reaches this current threshold. The PWM switch remains off until the beginning of the next switching cycle. This protects the device and external components during on overload conditions. When there is a sustained overcurrent condition, the device turns off and requires a POR or EN pin toggling to restart. Under severe overload and/or short-circuit conditions, the boost output voltage can be pulled below the required regulated voltage to keep all of the white LEDs operating. Under this condition, the current flows directly from input to output through the inductor and Schottky diode. To protect the TPS61183, the device shuts down immediately. The device restarts after input POR or EN pin toggling.”

    Since your pulse will last about 20us, it will trigger OCP for several cycles. I think this signal will be treated as the “Sustained overcurrent condition” and it will turn off the device. So I think the device will shut down when you put a 3-4A pulse current through internal NOMS.