Feedback Divider Control in Voltage Regulators to Prevent Undershoot
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Solution Overview
Problem
Existing voltage regulators experience an undershoot phenomenon during rapid changes in load current, leading to potential malfunction of downstream circuits.
Innovation Solution
A voltage regulator with a controller that adjusts the voltage division value of a feedback voltage divider in response to enable signals, increasing the output voltage during periods of high load current to prevent undershoot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the output voltage is increased during high load current periods, then the undershoot phenomenon is prevented, but the voltage stability for normal operation is compromised
Solution Approach 1:
The voltage divider is made dynamically adjustable through switching elements controlled by the controller. The switching elements change the resistance values in the voltage divider based on load current conditions, allowing the feedback voltage to be adjusted dynamically. This enables the system to prevent undershoot during high load periods while maintaining voltage stability during normal operation, resolving the contradiction between reliability and stability.
2Adaptability or versatility
If a fixed voltage divider is used, then the circuit is simple, but it cannot adapt to rapid changes in load current
Solution Approach 1:
The voltage divider transitions from a fixed configuration to a dynamic one with adjustable resistance values. Switching elements are introduced that can change the effective resistance based on controller signals, enabling adaptation to varying load conditions.
Solution Approach 2:
The controller receives feedback about load current conditions and adjusts the voltage divider configuration accordingly. This feedback mechanism allows the system to detect when rapid load changes occur and modify the feedback voltage to prevent undershoot, providing adaptability without excessive complexity.
3Productivity
If the feedback voltage is adjusted dynamically, then the output voltage can be optimized for different conditions, but the control complexity increases
Solution Approach 1:
The controller uses feedback signals to detect load current conditions and automatically adjusts the voltage divider configuration. This feedback-based control enables output voltage optimization for different operating conditions while keeping the control logic relatively simple through automatic detection and response.
Solution Approach 2:
The system performs self-adjustment through the controller that automatically detects load conditions and modifies the voltage divider without external intervention. This self-service capability optimizes output voltage for different conditions while minimizing the need for complex external control circuits.
Data Source
AI summary
A voltage regulator includes a voltage generator configured to receive a reference voltage and a feedback voltage and configured to generate an output voltage corresponding to the feedback voltage, a voltage divider configured to divide the output voltage to generate the feedback voltage, and a controller configured to control a voltage division value of the voltage divider in response to a program enable signal and a charge-pump enable signal during an activation period of an enable signal.