I am operating in burst mode with Fsw : 4MHz.
But , conducted noise on the input side shows a strong level at 2MHz.
Can you please tell me why the signal can be confirmed at 2MHz?
Thanks
Kotaro Suzuki
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LTC3309B
Recommended for New Designs
The LTC3309B is a very small, high efficiency, low noise, monolithic synchronous 6A step-down DC/DC converter operating from a 2.25V to 5.5V input supply...
Datasheet
LTC3309B on Analog.com
I am operating in burst mode with Fsw : 4MHz.
But , conducted noise on the input side shows a strong level at 2MHz.
Can you please tell me why the signal can be confirmed at 2MHz?
Thanks
Kotaro Suzuki
What is the load? This might be the burst mode frequency for the load. Below is a scope shot of the LTC3309A burst mode. The burst mode for the 4MHz app will be different because different inductor and output caps are used. The burst frequency also changes with load, line and VOUT. The burst frequency can be observed by looking at the SW node and output ripple.
