Reported by daveshah, Jul 23, 2020
PWM frequency needs to be increased from 83Hz, as the recommended range for the LM3699  is between 2kHz and 100kHz. As there is an internal low-pass filter, the intention is that this actually becomes an "analog" control rather than PWM giving an essentially flicker free output above 4kHz or so (see figure 15). Should be an easy change, just posting this to keep track of things.  https://www.ti.com/lit/ds/symlink/lm3699.pdf
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