SBVA102 august   2023 TPS56837

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2D-CAP3 Control Architecture
    1. 2.1 Adaptive On-Time Control
    2. 2.2 D-CAP3 Control
  6. 3Large Duty Cycle Operation
    1. 3.1 Min Off-Time Performance of Buck Converters
    2. 3.2 On-Time Extension Function
  7. 4Bench Test and Comparison
    1. 4.1 Comparison Between TPS56837 and TPS56637
    2. 4.2 Comparison of On-Time Extension between TPS56837 and TPS568230
    3. 4.3 Load Transient Improvement by On-Time Extension
  8. 5Summary
  9. 6References
  10. 7Also From TI

1 Introduction

For D-CAP3™ converters, some of them don't have large duty feature and its max duty is decided by the minimum off-time and frequency. Some converters such as TPS568230 can expand their on-time multiple times to support a larger duty cycle, which is introduced in the application note Large Duty Cycle Operation With the TPS568230. The other converters such as TPS56837 are able to extend the on-time smoothly. This application note will describe this feature of TPS56837 in detail.

The TPS56837 is a high-efficiency, easy-to-use, synchronous buck converter with a wide input voltage range of 4.5-V to 28-V, and supports up to 8-A continuous output current at output voltages between 0.6-V and 13-V. The TPS56837 includes an on-time extension feature which can support large duty cycle operation up to 98%.