SNVAA85 august   2023 LM25143 , LM25143-Q1 , LM25148 , LM25148-Q1 , LM25149 , LM25149-Q1 , LM5143 , LM5143-Q1 , LM5148 , LM5148-Q1 , LM5149 , LM5149-Q1 , LM61460 , LM61460-Q1 , LM61480 , LM61480-Q1 , LM61495 , LM61495-Q1 , LM62460 , LM62460-Q1 , LMQ61460 , LMQ61460-Q1 , TPSM63604 , TPSM63606 , TPSM63608 , TPSM63610

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2General Simple CC/CV Configuration Circuit
    1. 2.1 CC Circuit Design
    2. 2.2 CV Circuit Design
  6. 3Example Schematic
  7. 4Test Results and Performance Curves
    1. 4.1 Test Method
    2. 4.2 Power Module (TPSM63610)
    3. 4.3 Converter (LM61495)
    4. 4.4 Controller (LM5149)
  8. 5Summary
  9. 6References

Abstract

A buck converter is usually implemented as a constant voltage (CV) regulator. When the input voltage and load current change, the control loop adjusts the duty cycle to keep the output voltage constant.

However, more recently, many applications require regulation of both the output current and the output voltage. This is often refered to as constant current, constant voltage regulation (CC/CV). Typically, to implement CC/CV regulation, the designer needs to modify a CV regulation scheme adding circuitry to the feedback loop. This application note shows how to convert a peak current-mode (PCM) control scheme, configured as a CV regulator into a CC/CV regulator. The suggested approach herein can be applied to a controller, converter or module. Test results are also provided to demonstrate feasibilty.