LMZM33603: Using SW output pins as a driver of 1MHz sinewave

Avner Ezion

Part Number: LMZM33603

Pin 11 is mentioned and noted as: Do not place any external component on these pins or tie them to a pin of another function.

I intend to use the IC as a driver locked to 1.00MHz sync [DC=50%]. and drive a resonating load with high power pure sine wave.

Vout pin, with a capacitor, is to be used for FB,

Are there limitations on using the SW pins with a serial tuned LCR load?

or even a step up transformer loaded with tuned LCR load

0 J Arrigo over 7 years ago

The SW node of the LMZM33603 is not recommended to drive this LCR load.

As you mentioned, the datasheet states, "Do not place any external component on these pins or tie them to a pin of another function."

0 Avner Ezion over 7 years ago

Dear J Arrigo

Thanks for your remark. explain the difference between the SW output pins and the Vout pins that include the 6.8uH serial inductor.

Is there a similar module that may match my design.

0 J Arrigo over 7 years ago in reply to Avner Ezion

The SW node pins are the connection point of the high-side FET, low-side FET and inductor. The VOUT pins are after the output inductor.

We do not recommend any module to power circuitry directly from the SW node.

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