SLYY205A March   2021  – October 2022 TPS562211 , TPS562212 , TPS562231 , TPS563211 , TPS563212 , TPS563231 , TPS56339

 

  1.   At a glance
  2.   Authors
  3.   What is AECM control?
  4.   PCM
  5.   D-CAP2 control scheme
  6.   AECM control benefits
  7.   How AECM control works
  8.   PWM operation mode
  9.   PFM operation mode
  10.   Smart loop-bandwidth control
  11.   Conclusion
  12.   References
  13.   Additional Resources
No single control topology is a good fit for all applications. Designers requiring low electromagnetic interference (EMI) and fast load- transient response should consider advanced emulated current mode (AECM) – a new, constant-frequency and inductor-based control topology with smart loop-bandwidth control.

At a glance

1 What is AECM control?
AECM is a control topology based on a fixed-frequency modulation with emulated current information for the loop control.
2 PCM
PCM is a popular fixed-frequency control topology for DC/DC converters given its overload protection, accuracy and ease of compensation.
3 D-CAP2 control scheme
The D-CAP2 control scheme is a variation of adaptive COT control with an emulated ramp-generator circuit integrated inside the IC.
4 AECM control benefits
AECM control topology can help engineers simplify EMI filter design with fixed frequency and supports wide- output, large-duty-cycle applications with good load-transient performance
5 How AECM control works
AECM control offers mode-detection block to identify whether the DC/DC converter is in PWM mode or PFM mode. Its integrated oscillator generates the fixed clock in PWM mode, enables on-time generator and adjusts DC gain to achieve high bandwidth.