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TPS2511 over current protection

Timothy Starr
Expert 2445 points
Other Parts Discussed in Thread: TPS2511

Hello-

We are using TPS2511 USB charger in our design. There is a current limit and hiccup mode capabilities in that chip. It seems like due to the hiccup mode, current limit actually sets over current limit. What I mean by that is, if the current limit is set at 680 mA and we try to pull more the USB turns off instead of limiting the current. I believe what happens is we try to pull more current than the limit, voltage reduces below hiccup mode threshold of 3.8V, and device enters hiccup mode (turns off). Is this correct? If not what is the explanation for this behavior?

Thanks and Best Regards,

-Tim Starr on behalf of RK@ec

 

 

 

  • 0
    TI__Mastermind 42795 points

    Does the explanation on page 14 (Overcurrent Protection section and Figure 29) of the datasheet help?

    Specifically:

    Two possible overload conditions can occur. In the first condition, the output has been shorted before the deviceis enabled or before the voltage of IN has been applied. The TPS2511 senses the short and immediately switches into hiccup mode of constant-current limiting. In the second condition, a short or an overload occurs while the device is enabled. At the instant the overload occurs, high currents may flow for several microsecondsbefore the current-limit circuit can react. The device operates in constant-current mode for a period of 16 ms after the current-limit circuit has responded, then switches into hiccup mode (power cycling).

    Hopefully this helps.