The Function (FN, pin 3) is the invert or non-invert select Pin, it is Internally held high.

Microsemi’s products are covered by one or more of U.S. patents 4,895,810 5,045,903 5,089,434 5,182,234 5,019,522 5,262,336 6,503,786 5,256,583

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DRF1203

The Test Circuit illustrated above was used to evaluate the DRF1203 (available as an evaluation Board DRF12XX / EVALSW.) The input

control signal is applied to the DRF1203 via IN(4) and SG(5) pins using RG188. This provides excellent noise immunity and control of the

signal ground currents.

The +V

for this function must be capable of supporting the RMS currents and frequency of the gate load. A 50Ω (R4) load is used to evaluate the

output performance of the DRF1203.

Figure 2, DRF1203 Test Circuit

FN (pin 3)*

IN (pin 4)*

MOSFET

HIGH

HIGH

ON

HIGH

LOW

OFF

LOW

HIGH

OFF

LOW

LOW

ON