| 摘要 |
A fixed frequency dimming method and fixed frequency dimming circuit for a light emitting module can control light emitting brightness of the light emitting module through a hysteresis control circuit. A voltage difference between an upper limit voltage and a lower limit voltage of a hysteresis width of the hysteresis control circuit is maintained at a fixed value, and a driving current flowing through the light emitting module is changed by changing the upper limit voltage or the lower limit voltage.
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