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TPS65982 : OVP behavior when applied over 24V for a moment

Naokazu Kinjoh
Intellectual 2740 points
Other Parts Discussed in Thread: TPS65982, TPS65982-EVM

Hi team,

FW user's guide / TRM has a description below regarding to System Config (0x28h) OvpTripPoint(Bit[21:16]).

If the voltage on VBUS exceeds this value and OvpUsage is set to 00b, then VBUS will be disconnected from the input rails to protect the system. When set to 000000b, the OVP block is disabled if OvpUsage is set to 00b. The threshold in Volts is calculated as OvpTripPoint*0.32V + 3.84V. The range is therefore 4.16V to 24V.

When TPS65982 sets register setting below, if over 24V is applied to TPS65982 for a moment, what behavior does TPS65982 show?

System Config Reg. (0x28h)
・OvpUsage (Bit[23:22]) = 00b
・OvpTripPoint Bit[21:16]) = 000000b

Example customer wants to have.
　・If 24V ~ xx V is applied for less than __ms, no action is done. (Normal motion)
　・If more than xx V is applied for more than __ms, TPS65982 is internally reset.
　・If more than xx V is applied for more than __ms, TPS65982 should be possibly broken.
　・Others.

  • 0
    TI__Mastermind 30280 points
    Kinjoh-san,

    Your understanding of the behavior from the FW User's Guide/TRM sounds correct.

    Do you have a TPS65982-EVM?

    The best thing to do would be to test the behavior on an EVM with the settings the customer wishes to use, apply a Voltage step from a Waveform generator, and record the results on an oscilloscope (measuring VBUS & PP_HV/PP_EXT after a 20V PD Contract is negotiated.)