TPS25751D datasheet(31/89 Pages) TI1

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PP5V

CC1

Fast current limit, IVCON

CC2

CC2 Gate Control

VBUS

PP_5V Gate Control and Sense

PP_5V

Fast current clamp, ILIM5V

PP_CABLE

TSD_PP5V

Temp

Sensor

Temp

Sensor

CC1 Gate Control

Figure 8-12. Port Power Switches

8.3.3.1.1 PP_5V Current Clamping

The current through the internal PP_5V path are current limited to ILIM5V. The ILIM5V value is configured by

application firmware. When the current through the switch exceeds ILIM5V, the current limiting circuit activates

within tiOS_PP_5V and the path behaves as a constant current source. If the duration of the overcurrent event

exceeds tILIM, the PP_5V switch is disabled.

8.3.3.1.2 PP_5V Local Overtemperature Shut Down (OTSD)

When PP_5V clamps the current, the temperature of the switch begin to increase. When the local temperature

sensors of PP_5V or PP_CABLE detect that TJ > TSD_PP5V, the PP_5V switch is disabled and the affected port

enters the USB Type-C ErrorRecovery state.

8.3.3.1.3 PP_5V OVP

The overvoltage protection level is automatically configured based on the expected maximum VBUS voltage,

which depends upon the USB PD contract. When the voltage on the VBUS pin of a port exceeds the configured

value (VOVP4RCP) while PP_5V is enabled, then PP_5V is disabled within tPP_5V_ovp and the port enters into the

Type-C ErrorRecovery state.

8.3.3.1.4 PP_5V UVLO

If the PP5V pin voltage falls below its undervoltage lock out threshold (VPP5V_UVLO) while PP_5V is enabled, then

PP_5V is disabled within tPP_5V_uvlo and the port that had PP_5V enabled enters into the Type-C ErrorRecovery

state.

8.3.3.1.5 PP_5Vx Reverse Current Protection

If VVBUS - VPP5V > VPP_5V_RCP, then the PP_5V path is automatically disabled within tPP_5V_rcp. If the RCP

condition clears, then the PP_5V path is automatically enabled within tON.

8.3.3.1.6 PP_CABLE Current Clamp

When enabled and providing VCONN power, the TPS25751 PP_CABLE power switch clamps the current to

IVCON. When the current through the PP_CABLE switch exceeds IVCON, the current clamping circuit activates

within tiOS_PP_CABLE and the switch behaves as a constant current source.

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TPS25751

SLVSH93 – OCTOBER 2023

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