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www.fairchildsemi.com

FDMF6704V Rev. C

Timing Diagrams

Switch Node Ringing Suppression

Fairchild's DrMOS products have proprietary feature* that minimizes the peak overshoot and ringing voltage on the switch node

(VSWH) output, without the need of external snubbers. The following pictures show the waveforms of an FDMF6704 DrMOS part and

a competitor's part tested without snubbing. The tests were done in the same test circuit, under the same operating conditions.

* Patent Pending

Figure 4. Timing Diagram

PWM

GH to VSWH

GL

VSWH

Timeout

tri-state shutoff

Figure 5. FDMF6704

Figure 6. Competitor Part