SLUAAM9 November   2022 TPS56C230

 

  1.   Abstract
  2.   Trademarks
  3. 1OOB Operation Principle
  4. 2Differences Between OOB and OVP
  5. 3OOB Operation Logic
    1. 3.1 Case 1: <OV Threshold, >OOB Threshold
    2. 3.2 Case2: >OV Threshold
  6. 4OOB Advantage in Load Transient
  7. 5Summary
  8. 6References

4 OOB Advantage in Load Transient

OOB function is beneficial for the settle time during load transient. There could be a output overshoot when load current changes from high to low, as shown in Figure 4-1 and Figure 4-2. TPS56C230 with OOB function will turn on low-side FET to discharge output voltage, and its Vout becomes stable quicker than TPS51397A without OOB function. Test condition: 12Vin-1.2Vo-Eco mode-Load Transient 1-10A.

Figure 4-1 TPS51397A Load Transient (without OOB)
Figure 4-2 TPS56C230 Load Transient (with OOB)