DEI EVDD404 Datasheet

EVDD404

IXDD404 Gate Driver IC Evaluation Board

General Description

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.

Circuit Operation

The schematic diagram for the evaluation board is shown in
Figure 4. The control gate is applied to R4 then on the input
pins 2 and 4 of the IC U1 (or to pins 2 and 7 of U2, if loaded
in place of U1). This signal input is followed in time by the
output pins 5 and 7 of U1 (or pins 10, 11, 14 and 15 of U2, if
loaded). Pins 1 and 8 of U1 and U2 are attached to +VCC
via a de-coupling network comprised of R1, C3 and R10,
C4. Pin 3 of U1 and pins 4 and 5 of U2 are attached to the
circuit ground plane. This is the preferred arrangement of
the bypassing for the Vcc input power. The enable pins 1
and 8 of U1 and U2 are attached to the drain of Q4. This
device is used to level translate and provide an invert
function for the Tri-State mode. The drain of Q4 is also
attached to the gate of the MOSFET thru RA1 and DA1. In
the Tri-State mode the turn off time of the power MOSFET is
determined by the time constant of the input gate
capacitance C
IXDD404 data sheet for additional information on this mode
of operation.

The U1 output is available at pins 5 and 7 of U1 (or pins 10,
11, 14 and 15 of U2, if loaded). These are attached to the
MOSFET via the two one-Ohm resistors R5 and R7. The
values of these resistors may be changed to optimize the
performance of the specific device being driven. The board
is designed to parallel the two outputs of the IXDD404 IC,
generating up to 8A of output current. If only one output
channel is desired, the other channel may be disabled by
removing either R5 or R7, thereby disconnecting that

and the value of the resistor RA1. See the

iss

channel's output from the MOSFET gate.
There are three test points on the board: Control, Gate and

Drain. These allow the user to easily attach an oscilloscope
probe and the associated ground to the circuit to verify
performance.

Figure 1 - EVDD404 Evaluation Board
SOT-227 Device Installed For Illustration Purposes Only

Evaluation PCB
TO-220, TO-247,

TO-264, or SOT-227

Heat Sink

Figure 2 - EVDD404 Side View Showing Power Device
Installed In A High-Power Configuration

INPUT FUNCTION

CONTROL Control Input - 3V into 1K Ohms

GND1 Ground 1

ENABLE LOW = True, HIGH = Tri-State Mode

GND2 Ground 2

VCC-IN VCC input - 8V to 25V

GND 3 Ground 3

Figure 3 - Input Pin-Out Table

Kapton Insulator

The EVDD404 is supplied with the IXDD404PI DIP-8 device
installed. To use the evaluation board with a different
package type, the installed device must be removed, and
the new device installed in the appropriate location.

Ordering Information

Part Number Installed Device

EVDD404 IXDD404PI DIP-8

Copyright © IXYS CORPORATION 2001

First Release

Figure 4 - EVDD404 Schematic Diagram

EVDD404

NOTES: 1) The schematic shows all three output switches, however only one device can be installed at any one time.

2) U1 reflects the DIP- 8 package type (PI), and U2 reflects the SO-16 (SI-16) package type. However only one device
may be installed and used in the evaluation board at one time.

Figure 5 - IXDD404 10ns Gate Rise Time

CL=1800pF

Figure 6 - IXDD404 Typical Output Waveform

F=500KHz, CL=1800pF

IXYS Corporation
3540 Bassett St; Santa Clara, CA 95054
Tel: [phone]; Fax: [phone]
e-mail: [e-mail]

IXYS Semiconductor GmbH
Edisonstrasse15 ; D-68623; Lampertheim
Tel: [phone]; Fax: [phone]
e-mail: [e-mail]

2

Directed Energy, Inc.
An IXYS Company
2401 Research Blvd. Ste. 108
Ft. Collins, CO 80526
Tel: [phone]; Fax: [phone]
e-mail: [e-mail]

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