EVDD408 Просмотр технического описания (PDF) - Directed Energy, Inc. An IXYS Company

Номер в каталоге

Компоненты Описание

производитель

EVDD408

Gate Driver IC Evaluation Boards

Directed Energy, Inc. An IXYS Company 

EVDD408 And EVDD414

IXDD408 And IXDD414 Gate Driver IC Evaluation Boards

General Description

The EVDD408/EVDD414 evaluation boards are general-

purpose circuit boards designed to simplify the evaluation of

the IXYS IXDD408 and IXDD414 gate drive ICs, as well as to

provide a building block for power circuit development. Any of

the four gate driver package types (SO-8, Dip 8, 5pin TO-220

and the 5pin TO-263) may be installed in the driver (the 5-Pin

TO-263 is factory installed. The board enables the user to

drive MOSFETs or IGBTs in the 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. The board layout for the gate driver

in the TO-220 and the TO-263 packages (designator U1B),

allows the ground tab to be soldered to the ground plane for

cooling in high-power, high frequency applications with large

MOSFET devices. Circuitry for the Tri-State function is also

included on the evaluation board.

Figure 1 is a photograph of the IXDD408/414 Evaluation

Board loaded with an IXDD408YI TO-263 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 R6 then on the input

pin 2 of the IC. This signal input is followed in time by the

output pins 7 and 6. Pins 1 and 8 are attached to +VCC via a

de-coupling network comprised of R1, C1 and R2, C2. Pins 4

and 5 are attached to the circuit ground plane. This is the

preferred arrangement of the bypassing for the Vcc input

power. The enable pin 3 is 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 RA and DA. In the Tri-State mode

the turn-off time of the power MOSFET is determined by the

time constant of the input gate capacitance Ciss and the value

of the resistor RA. See the IXDD408 and IXDD414 data

sheets for additional information on this mode of operation.

The U1 output is available at pins 7 and 6. These are

attached to the MOSFET via the two one-Ohm resistors R4

and R5. The values of these resistors may be changed to

optimize the performance of the specific device being driven.

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 - EVDD408/EVDD414 Evaluation Board

SOT-227 Device Installed For Illustration Purposes Only

Heat Sink

Evaluation PCB

TO-220, TO-247,

TO-264, or SOT-227

Kapton Insulator

Figure 2 - EVDD408/EVDD414 Side View Showing Power

Device Installed In A High-Power Configuration

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

Figure 3 - Input Pin-Out Table

The EVDD408/EVDD414 are supplied with either IXDD408YI

or IXDD414YI 5-Pin TO-263 devices 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

EVDD408

IXDD408YI 5-Pin TO-263

EVDD414

IXDD414YI 5-Pin TO-263

Copyright © IXYS CORPORATION 2001

First Release

Share Link: