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

2 General Simple CC/CV Configuration Circuit

Typically, the output voltage of buck can be set using external resistive dividers from the output to the relevant FB pin, which achieves CV regulation. In order to achieve CC regulation, a current sensing circuitry needs to be added to the feedback loop. This circuitry provides a voltage signal to the FB pin, that is proportional to the output current. However, it is necessary to add an additional follower circuit to the voltage feedback loop in order to prevent both CC/CV regulation schemes working at the same time. Adding the follower circuit to the CV feedback loop ensures that only CC or CV regulation is in control at any given time. The feedback loop with the higher voltage, present at the FB pin determines which one of the two regulation schemes, is in control. Figure 2-1 shows a common CC/CV scheme.

GUID-20230718-SS0I-ZKGG-JPBN-XP9C90N89CFS-low.svgFigure 2-1 CC/CV Configuration Circuit