SLUAAN2 april   2023 TPS543620 , TPS54620 , TPS54J060 , TPS54J061 , TPS566231 , TPS566235 , TPS566238 , TPS566242 , TPS566247

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
  4. 2Features Description
    1. 2.1 Light Load Operation
    2. 2.2 Large Duty Operation
    3. 2.3 BST Cap Integrated
    4. 2.4 Voltage Identification Control
    5. 2.5 Output-voltage Tracking
  5. 3Control Modes Description
    1. 3.1 PCM/ACM
    2. 3.2 D-CAP2™/D-CAP3™
    3. 3.3 Control Modes Comparison
  6. 4Specifications Comparison
  7. 5References

D-CAP2™/D-CAP3™

The term D-CAP means the current information is Direct connection to the output CAPacitor. TI’s first D-CAP™ controller, the TPS51116, was realized by combining a controller with a constant on-time modulator. Today, TI has a family of products featuring various modulators and next-generation forms of the original D-CAP™ control.

The first generation D-CAP™ requires large ESR at the output bulk cap to stabilize the loop. D-CAP2™ doesn't have this requirement, supports the output ceramic capacitors with internal phase compensation. An internal inductor ripple current “emulator” circuit is used to generate a sufficient ramp for D-CAP2™ control to compare the output voltage vs. the reference voltage to determine whether to turn the PWM on or not.

D-CAP3™ also supports the output ceramic capacitors with internal phase compensation. D-CAP3™ mode improves the output voltage set-point accuracy by implementing specialized circuits to remove the half time ramp magnitude.