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Application Circuit Description
The ACPL-P349/ACPL-W349 is an isolated Gate Driver which provides 2.5 A output current. The voltage and high peak
output current supplied by this optocoupler make it ideally suited for direct driving of IGBT or SiC/GaN Mosfet with rat-
ings up to 1000V/100W. It is also designed to drive different sizes of buffer stage that will make the class of IGBT or SiC/
GaN MOSFET scalable. ACPL-P349 (& ACPL-W349) provides a single isolation solution suitable for both low and high
power ratings of motor control and inverter applications.
Each of the ACPL-P349/ACPL-W349 evaluation boards, as shown in Figure 5, accommodates 2 ACPL-P349/ACPL-W349
IC’s. Therefore, each board is capable of driving top and bottom arms of the half-bridge Inverter. It allows the designer
to test the performance of the gate driver in an actual application under real-life operating conditions. Operation of the
evaluation board requires a common 5V DC isolated Supply1 on the input side and an isolated DC supply2 (range from
15V ~ 30V) for the bottom arm of Inverter IGBT or SiC/GaN MOSFET, while the DC supply needed for the top arm is easily
generated through bootstrapping included in the evaluation board.
Figure 5. Top & Bottom Views of ACPL-P349/W349 Evaluation Board
Note: As can be seen on the board, the isolation circuitry (at the far left) is contained within a small area while maintaining adequate spacing for good
voltage isolation and easy assembly.
