Switch Control Circuit Pin Configuration for Dead Time and Protection
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Solution Overview
Problem
The increasing number of required functions in controllers leads to an increase in the number of pins and size of the control IC, resulting in higher production costs.
Innovation Solution
A switch control circuit and power supply device that utilize a multifunctional pin connected to a resistor, capacitor, and diode to set multiple control information, including dead time and protection mode, using a multi-voltage signal, thereby minimizing the number of pins and IC size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of required functions is increased, then the control capability is improved, but the number of pins and size of control IC is increased
Solution Approach 1:
The patent applies multi-functionality by enabling a single pin to perform multiple functions: setting dead time for primary switches, setting dead time for synchronous rectification switches, and setting protection modes. This is achieved through voltage level detection and timing circuits that interpret different voltage durations applied to the pin during initialization periods, allowing one pin to replace what would traditionally require multiple dedicated pins.
2Adaptability or versatility
If the number of pins is increased, then more control functions can be set, but the production cost is increased
Solution Approach 1:
The patent reduces production cost by minimizing the number of pins required on the control IC. By designing a pin that can be configured through voltage duration timing to set multiple parameters (dead times and protection modes), the physical pin count is reduced, which directly lowers manufacturing complexity and production costs associated with higher-pin-count packages.
Data Source
AI summary
A switch control circuit includes a first pin connected to a first voltage, and a second pin connected to another end of a first resistor including an end connected to the first pin and a first capacitor. In the switch control circuit, at least two of first dead time information, second dead time information, and a protection mode are set by using a multi-voltage of the second pin. The first dead time information is information about a dead time of a first switch and a second switch controlling power supply, the second dead time information is information about a dead time for synchronous rectification, and the protection mode includes an auto-restart mode and a latch mode.