SLUAAE4 May   2021 TPS563211

 

  1.   Trademarks
  2. 1TPS563211 Introduction
  3. 2TPS563211 Control Architecture
    1. 2.1 AECM Control on TPS563211
    2. 2.2 AECM Control Principle
  4. 3Large Duty Cycle Operation in the TPS563211
    1. 3.1 On-Time Extension Function
    2. 3.2 TPS563211 EVM Bench Test
    3. 3.3 Summary for Bench Test Results
  5. 4Summary
  6. 5References
  7. 6Also From TI

3.3 Summary for Bench Test Results

With On-Time Extension triggered, when loading is added to 3 A, the maximum duty cycle drops. This is caused mainly by the power loss of the RDS(ON) of the HSFET and LSFET, and the power loss of the DCR of the external inductor.

With frequency foldback, VIN_VIN is lowered by decreased fSW, as shown in Figure 3-5.

GUID-20210427-CA0I-VG4W-4989-XJMXD4GS3C83-low.gif Figure 3-5 Frequency Foldback at Dropout (VOUT = 5 V)