SLVAFE5 September   2022 TPS92610-Q1 , TPS92611-Q1 , TPS92612-Q1 , TPS92613-Q1

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
  4. 2TPS9261x-Q1 Fault Detection and Discrete Fault Detection Introduction
    1. 2.1 Discrete Fault Detection
    2. 2.2 Open Load vs Short-to-Battery Detection
    3. 2.3 Short to Ground vs Overtemperature Detection
    4. 2.4 Fault Detection Logic Summary
  5. 3Discrete Fault Detection Circuit Details
    1. 3.1 Simulation
    2. 3.2 PCB Implementation
    3. 3.3 Test Setup
    4. 3.4 Thermal Testing for Overtemperature Conditions
  6. 4Conclusion
  7. 5References

3.1 Simulation

The fault detection circuit was created on PSpice® and an independent voltage source was used to simulate different voltage conditions on the TPS9261x-Q1 output. Figure 3-2 shows the circuit when the TPS9261x-Q1 output voltage is below the trip point of 8.5 V.

GUID-20220902-SS0I-R1HZ-LL0P-KPFVZQ7TPNJJ-low.png Figure 3-2 Simulation With TPS9261x-Q1 Vout Below the Trip Point

An 8-V voltage was applied to the fault detection circuit and with accordance to the truth table in Table 3-1. A proper LOW output is shown at SB/OL. Figure 3-3 shows the circuit when a voltage above the trip point of 8.5 V is present.

GUID-20220902-SS0I-1JP1-H1MQ-9VVXCF9ZKRNP-low.png Figure 3-3 Simulation With TPS9261x-Q1 Vout Above the Trip Point

A voltage of 9 V was applied to the fault detection circuit and with accordance to Table 3-1 the Vcomp output is HIGH as shown on SB/OL.