JAJSCF6G July 2016 – December 2019 TPS2660
PRODUCTION DATA.
The TPS2660x incorporate circuitry to protect the system during overvoltage conditions. The TPS26600 and TPS26601 feature overvoltage cut off functionality. A voltage more than V(OVPR) on OVP pin turns off the internal FET and protects the downstream load. To program the OVP threshold externally, connect a resistor divider from IN supply to OVP terminal to RTN as shown in Figure 34. The TPS26600 and TPS26601 also feature a factory set 33-V Input overvoltage cut off V(IN_OVP) threshold with a 2-V hysteresis. This feature can be enabled by connecting the OVP terminal directly to the RTN terminal. Figure 27 illustrates the overvoltage cut-off functionality.
The TPS26602 features an internally fixed 38 V overvoltage clamp (VOVC) functionality. The OVP terminal of the TPS26602 must be connected to the RTN terminal directly. The TPS26602 clamps the output voltage to VOVC, when the input voltage exceeds 38 V. During the output voltage clamp operation, the power dissipation in the internal MOSFET is PD = (VIN – VOVC) × IOUT. Excess power dissipation for prolonged period can make the device to enter into thermal shutdown. Figure 28 illustrates the overvoltage clamp functionality.