EVDN404【PDF 1/2 页】BOARD EVALUATION IXDN404

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EVDD404

IXDD404, IXDI404 And IXDN404 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, IXDI404 and IXDN404 gate drive ICs, as well as to

provide a building block for power circuit development.

Either the DIP-8 (PI) or SO-16 (SI-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. (The Tri-State output is not used with the IXDI404

and IXDN404 ICs). 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

channel is desired, the other channel may be disabled by

removing either R5 or R7, thereby disconnecting that

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

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

Heat Sink

TO-220, TO-247,

TO-264, or SOT-227

Kapton Insulator

mounted in a similar manner.

Figure 2 - EVDD404 Side View Showing Power Device

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

Installed In A High-Power Configuration

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

INPUT

CONTROL

GND1

ENABLE

GND2

VCC-IN

GND 3

FUNCTION

Control Input - 3V into 1K Ohms

Ground 1

LOW = True, HIGH = Tri-State Mode

Ground 2

VCC input - 8V to 25V

Ground 3

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 iss and the value of the resistor RA1. See the

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,

Figure 3 - Input Pin-Out Table

The EVDD404 is supplied with the DIP-8 (PI) device in-

stalled. 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

EVDI404 IXDI404PI DIP-8

EVDN404 IXDN404PI DIP-8

generating up to 8A of output current. If only one output

First Release

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