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Texas Instruments LM3409HV: constant current operation, frequency is not stable, repeats 170kHz and 150kHz. Will there be variability of this magnitude?
Distortion is expected to occur. The LM3409HV uses the constant-off method and has the following three features.
- Variable ON time
- Fixed off time
- not built in oscillator
As a result, the switching frequency changes depending on the input/output conditions. It uses hysteretic control, so it has many high performance and ease-of-use advantages, but the switching frequency is not constant.
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