TPS65982ABZBHR datasheet(42/121 Pages) TI1

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VREVHV

VBUS-PP_HV

1/RPPHV

VREVHV/RPPHV

1/RPPHV

VREVHV

IREVHV

TPS65982

SLVSD02D – MARCH 2015 – REVISED JUNE 2019

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9.3.3.6 Internal HV Power Switch as a Source

The TPS65982 provides power from PP_HV to VBUS at the USB Type-C port as an output when operating as a

source. When the switch is on as a source, the path behaves resistively until the current reaches the amount

calculated by Equation 3 and then blocks reverse current from VBUS to PP_HV. Figure 25 shows the diode

behavior of the switch as a source.

IREVHV = VREVHV/RPPHV

(3)

Figure 25. Internal HV Switch I-V Curve as a Source

9.3.3.7 Internal HV Power Switch as a Sink

The TPS65982 can also receive power from VBUS to PP_HV when operating as a sink. When the switch is on

as a sink the path behaves as an ideal diode and blocks reverse current from PP_HV to VBUS. Figure 26 shows

the diode behavior of the switch as a sink.

Figure 26. Internal HV Switch I-V Curve as a Sink

9.3.3.8 Internal HV Power Switch Current Sense

The current from PP_HV to VBUS is sensed through the switch and is available to be read digitally through the

ADC only when the switch is sourcing power. When sinking power, the readout from the ADC will not reflect the

current.

9.3.3.9 Internal HV Power Switch Current Limit

The current through PP_HV to VBUS is current limited to ILIMPPHV (only when operating as a source) and is

controlled automatically by the digital core. When the current exceeds ILIMPPHV, the current-limit circuit

activates. Depending on the severity of the over-current condition, the transient response will react in one of two

ways: Figure 27 shows the approximate response time and clamping characteristics of the circuit for a hard short

while Figure 28 shows the approximate response time and clamping characteristics for a soft short of 7 Ω.

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