Power Converter Feedback Terminal Parameter Setting
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Solution Overview
Problem
Conventional switching power controllers require an external sensing resistor, increasing the number of pins and production costs.
Innovation Solution
A controller design that incorporates a sample-and-hold circuit and a current source to generate a programming voltage within the controller, eliminating the need for an external sensing resistor by using a feedback signal to set parameters through a feedback terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an external sensing resistor is used for parameter setting, then the controller can perform parameter setting, but the number of pins and production cost increase
Solution Approach 1:
The patent merges the sensing resistor function with the feedback terminal by applying the programming signal directly to the feedback terminal. This eliminates the need for a separate external sensing resistor and reduces the number of required pins, while maintaining the parameter setting capability through the integrated feedback terminal
2Adaptability or versatility
If an external sensing resistor is used for parameter setting, then the controller can perform parameter setting, but the production cost increases
Solution Approach 1:
The feedback terminal is given multiple functions: it serves both as the feedback signal input terminal and as the parameter setting terminal by accepting the programming signal. This multi-functionality eliminates the need for separate external components for parameter setting, reducing production cost while maintaining adaptability
Data Source
AI summary
A control circuit of a power converter according to the present invention comprises a switching circuit, a sample-and-hold circuit and a current source. The switching circuit generates a switching signal in response to a feedback signal. The sample-and-hold circuit samples the feedback signal. The current source is coupled to a feedback terminal for generating a programming voltage. A programmable signal is generated in accordance with the programming voltage and the feedback signal, and the programmable signal is coupled to set a parameter.