The EVDD404 evaluation board is a general-purpose circuit board designed to simplify the evaluation of the IXYS IXDD404 gate drive IC, as well as to provide a building block for power circuit development. Either the DIP-8 (IXDD408PI) or SO-16 (IXDD408SI-16) gate driver package types may be installed in the driver (the DIP-8 package is factory installed). The board enables the user to drive MOSFETs or IGBTs in TO-220, TO-247, TO-264 or SOT-227 packages. The evaluation board design allows these MOSFETS to be attached to a heat sink, and in so doing the board assembly can be used as a ground referenced, low side power switch for both single-ended and push-pull configurations. Circuitry for the Tri-State function is included on the evaluation board. Figure 1 is a photograph of the IXDD404 Evaluation Board loaded with an IXDD404PI DIP-8 driver and a SOT-227 MOSFET. The low level inputs are shown on the left side of the board. CONTROL is a TTL high true input which controls the on or off state of the power switch Q1, Q2, or Q3. ENABLE is a low true input, which controls the Tri-State output. VCC-IN is the low voltage, (8-25V) power input, (see Figure 3 below). Figure 2 illustrates the MOSFET mounting of a TO-220, TO-247, or TO-264 device. The MOSFET is mounted on the back side of the PCB. A large through hole is provided so that the device can be attached to a heat sink. The SOT-227 (shown in the photograph) is mounted in a similar manner.