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A comment on Ask HN: Why is coil whine in electronics so prevalent?. Parent comment

Re:Ask HN: Why is coil whine in electronics so prevalent? by kevin_thibedeau on Sunday November 06, 2022 @07:27PM (#33499399)
Constant current LED drivers usually use PWM for brightness control. They still have a low value shunt resistor to set the fixed current limit. Making a system with variable current adds much more complexity.
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Re:Ask HN: Why is coil whine in electronics so prevalent? by tomn on Sunday November 06, 2022 @07:54PM (#33499628)
True, some do, though some don't (and some have both). Even dedicated LED drivers using PWM can be better than simple PWM by using smarter modulation to get high resolution without reducing the frequency to something noticeable.
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