First Release

Copyright © IXYS CORPORATION 2003

General Description

EVDD430S / EVDD430CY

The EVDD430S / EVDD430CY evaluation boards are

general-purpose circuit boards designed to simplify the

evaluation of the IXYS IXDS430, IXDD430, IXDI430, and

IXDN430 MOSFET / IGBT driver, as well as to provide a

building block for power circuit development. Any of three IC

package types, SOIC-28, 5 lead TO-220, and 5 lead TO-263

are available on two different boards. The board layouts

enable the use of MOSFETs or IGBTs in the TO-247, TO-264

or SOT-227 packages and also allow the driven devices to

be mounted to a heat sink. In doing so, the board

assemblies can be used as a ground referenced, low side

power switch for both single-ended and push-pull

configurations. The board layout for all three driver packages

allows the device tabs to be soldered or strapped to a

ground plane for improved cooling in high-power, high

frequency applications with large MOSFET devices. The

layouts have also been optimized for minimal trace routing

and maximized area to reduce inductance and enhance

performance.

Figures 1and 2 are photographs of the front and back of the

EVDD430CY board loaded with an IXDI430CI TO-220 driver

while figures 3 and 4 show the EVDD430S board equipped

with the IXDS430S 28 pin SOIC package. The low level

inputs are shown at various points on the boards. The

'Signal In' is a TTL or CMOS level compatible input which

controls the on or off state of the power device Q1or Q2.

'Disable' is a optional input, depending on which device is

installed, and controls the Tri-State output (IXDD430, and

IXDS430 devices only). The Tri-State mode could be used in

a motor drive circuit in which an over current could be

detected and then a disabling signal fed back, to control the

turn off of an IGBT at a slower rate through a seperate 'bleed

off' resistor. The 'VCC-IN' is the low voltage (8.5-35V) supply

input. Figures 5 and 6 illustrate the mounting of a TO-247,

TO-264, SOT-227 power devices.

30A Ultra Fast MOSFET / IGBT Driver Evaluation Boards

The drive output is attached to the MOSFET / IGBT via the

gate drive resistor positions. The resistors can be replaced

with values to optimize the turn on, turn off performance of

the design. The IXDS430S also includes seperate drive

output source / sink pins and the EVDD430S evaluation

board is arranged such that the turn on rate can be different

from the turn off rate via the seperated output pins of the

device. The IXD_430 C and Y output pins are internally

connected and have just one set of gate resistors.

Finally, the devices are available with an undervoltage trip

point of 8.5V or 11.75V, see order table. If the supply voltage

dips below this fixed point, drive to the power device is

disabled. This feature is selectable on the EVDD430S PCB

by way of JP2 while JP1 provides the option to invert the

drive signal.

Circuit Operation

The schematic diagrams for the evaluation boards are

shown in Figures 8 and 9. The external drive signal is

applied to 'Signal In' test point. The PCBs also provide

solder pads across the 50 Ohm input resistor R4 so that a

coax can be soldered directly to the board.The PCBs have

been designed in an attempt to minimize parasitic

inductance associated with long and narrow traces. Large

attachment points have been provided so that the user can

connect larger wire or copper strap to minimize loop

inductance. The diode, resistor combination of DA and RA

provides a controlled rate discharge path for the gate of the

power device when the Enable function forces the driver into

its Tri-State mode. In this mode, the turn-off time of the

power device is determined by the time constant of the input

gate capacitance C

has not been loaded so that the user may choose the value

which best suits the design.

Ordering Information

Part Number

Companion Device (1)

Options

EVDD430CI

IXDD430CI

TO-220

UV = 11.75

NI with Enable

EVDD430MCI

IXDD430MCI

TO-220

UV = 8.5

NI with Enable

EVDD430YI

IXDD430YI

TO-263

UV = 11.75

NI with Enable

EVDD430MYI

IXDD430MYI

TO-263

UV = 8.5

NI with Enable

EVDI430CI

IXDI430CI

TO-220

UV = 11.75

Inverting

EVDI430MCI

IXDI430MCI

TO-220

UV = 8.5

Inverting

EVDI430YI

IXDI430YI

TO-263

UV = 11.75

Inverting

EVDI430MYI

IXDI430MYI

TO-263

UV = 8.5

Inverting

EVDN430CI

IXDN430CI

TO-220

UV = 11.75

NI

EVDN430MCI

IXDN430MCI

TO-220

UV = 8.5

NI

EVDN430YI

IXDN430YI

TO-263

UV = 11.75

NI

EVDN430MYI

IXDN430MYI

TO-263

UV = 8.5

NI

EVDS430SI

IXDS430SI

28 pin SOIC

UV / Invert = Selectable w/ Enable

UV = Under Voltage Trip Point, NI = Non Inverting

(1) Companion device to be mounted by user.