R1

1%

R2

1%

R1 + R2 = 500 k , max.

Ω

+

-

OVP_REF

OVP_detect

VBUS

OVP

PPHV Gate Control

and RCP

PPHV

V

= OVP_REF * (1 + R1/R2)

VBUS_OVP_THRESHOLD

14

TPS66020, TPS66021

SLVSEW8 – AUGUST 2019

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Product Folder Links: TPS66020 TPS66021

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8.4 Overtemperature Protection

The PP5V and PPHV power paths each have an integrated temperature sensor to protect these paths from

excessive heating. When the sensor in each respective path detects an overtemperature condition, the path will

be automatically disabled (if enabled) and cannot be enabled until the overtemperature condition has been

removed. FLT is asserted when an overtemperature event occurs.

In addition, the device has an integrated main temperature sensor. When the sensor detects an overtemperature

condition, the PP5V and PPHV power paths and the VBUS LDO of the device are completely disabled until the

overtemperature condition has been removed.

8.5 VBUS Overvoltage Protection (OVP)

TPS6602x supports overvoltage protection on the VBUS terminal. When the voltage detected on OVP exceeds a

set level, the PPHV power path will automatically be disabled (if enabled), and will remain disabled until the OVP

event is removed. FLT is asserted when an overvoltage event occurs. The VBUS OVP threshold may be set

using a resistor divider from VBUS to GND, whose divider output is connected to the OVP terminal as shown in

Figure 2. Table 1 shows resistor divider settings for common USB Power Delivery fixed voltage supply contracts

along with the resulting nominal OVP thresholds. These thresholds may be adjusted based on desired margins

for a given application. If VBUS OVP is not required or needs to be disabled, the OVP terminal may be tied or

driven to GND as shown in Figure 3. Lastly, as one example implementation, the OVP threshold may be

controlled dynamically using outputs from a PD controller or microcontroller as shown in Figure 4. By selecting

each output, different VBUS OVP threshold settings are possible.

Figure 2. VBUS OVP Threshold Set by External Resistor Divider

Table 1. Typical External Resistor Divider Settings

PD Fixed Contract

R1, kΩ

R2, kΩ

Nominal VBUS OVP Threshold, V

5 V

102

20

6.1

9 V

182

20

10.1

15 V

309

20

16.5

20 V

432

20

22.6