SLVSEW9B August 2019 – December 2019 TPS66120 , TPS66121
PRODUCTION DATA.
TPS6612x 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 5. 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 6. Lastly, as one example implementation, the OVP threshold may be controlled dynamically using outputs from a PD controller or microcontroller as shown in Figure 7. By selecting each output, different VBUS OVP threshold settings are possible.
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 |