Controller for a flyback converter
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United States of America Patent
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Oct 24, 2023
Grant Date -
Jun 1, 2023
app pub date -
Nov 30, 2021
filing date -
Nov 30, 2021
priority date (Note) -
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status (Latency Note)
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Abstract
A converter control circuit includes a terminal to be coupled to a switch node. The control circuit includes a valley sensing circuit coupled to the terminal and detects valleys in an oscillating voltage on the switch node. The valley sensing circuit has a first output and asserts a first control signal on the first output indicative of occurrence of a valley. A logic gate has a second output and asserts a second control signal on the second output to turn on a switching transistor. A switch-on control circuit has a first input and a second input. The first input couples to the first output. The second input couples to the second output. The switch-on control circuit asserts a third control signal to turn on the switching transistor responsive to the second control signal indicating that the switching transistor is to be on while the first control indicates a valley.
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