7

EVBD4400

FLT Reset

Vcc

Vcc

(From FLT)(n.h.)

10K

10K

.01uF

.01uF

To Eval bd INH

To Eval bd INL

INH

INL

1

2

3

4

5

6

9

10

8

12

13

11

1 2

34

74HC00 1/4

74HC00 2/4

74HC00 3/4

74HC00 4/4

74HC04 1/6

74HC04 2/6

In Figures 4 & 5, the schematic assumes the de-

signer will be using some type of external control system

for starting the circuit and/or reseting the circuit in the

event a fault occures. As an alternative, Figure 6

demonstrates a simple and inexpensive Start/Reset logic

circuit for manually implementing fault protection.

With the addition of High Current MOSFET Drivers on

the outputs, the IXBD4410/11's typical 2A Peak Output

Current capability can be "boosted" to drive the latest

IXYS MOSFETS & IGBT's.

Figure 6: Simple Fault Protection Logic Circuit

Figure 6 shows the addition of two IXDD414's.

These are CMOS high-speed MOSFET drivers that

have a 14A Peak Output Drive Capability, allowing the

4410/11 chipset to drive a pair of IXFK90N20Q 90A/

200V Power Mosfets. (The 2 ohm gate resistors

shown should be Non-Inductive High Performance Film

resistors such at those available from Caddock. Par-

ticular attention also needs to be paid to Suppy By-

passing, Grounding, and minimizing the Output Lead

Inductance when designing such a high power circuit

layout).