© 2004 IXYS All rights reserved

IXBD4410

IXBD4411

Chipset Overview

integrated circuits providing isolated

high- and low-side drivers for phase-

leg motor controls, or any other

application which utilizes a half bridge,

2- or 3-phase drive configuration. They

consist of two drive control inputs (INL

and INH) for two Power-MOSFET/IGBT

gate-drive outputs. Both inputs operate

from a common ground and are

activated by HCMOS compatible logic

levels. The low-side output operates

near input ground, while the high-side

output operates from a floating ground

that is nominally the source connection

of the high-side phase-leg power

device. Both outputs typically provide 2

A of transient current drive for fast

switching of the phase-leg power

device.

IXBD4410/IXBD4411

chipset incorporates a IXBD4410 as

the low-side driver (Fig. 3) and a

IXBD4411 as the high-side driver (Fig.

2). When input "INL" is set to a positive

logic level, the low-side gate output

goes high (turns on); when "INH" is set

to a positive logic level, the high-side

gate drive output goes high. The high-

side IC is isolated from the low-side IC

by a magnetic barrier, across which the

turn on/off signal is transmitted to the

high-side gate drive. The IXBD4411

fault signal is also transmitted back to

the IXBD4410 driver via these

transformers. This isolation only

depends on the low cost communica-

tions transformer, which is designed to

withstand 1200 V or more.

There are two magnetic transmission

channels between the low- and high-

side IC's for bi-directional communi-

cation. One sends a signal from the

low-side IXBD4410 IC up to the high-

side IXBD4411 IC and the other sends

a signal back from the high-side to the

low-side IC. The signal that is sent up

controls the IXBD4411 gate-drive

output. The signal sent from the

IXBD4411 back to the IXBD4410

indicates a high-side fault has occurred

(overcurrent, or under-voltage of the

high-side +power supplies). This is

detected at the IXBD4410 driver and

sets "FLT" pin low, to indicate the high-

side fault.

The fault signal that is returned from

15

14

13

12

V

EE

V

DD

UV

DD

Fig. 2: IXBD4411, high-side driver block diagram

15

14

13

12

V

DD

V

EE

UV

DD

UV

EE

Fig. 3: IXBD4410, low-side driver block diagram

Fig. 4: Logic representation of IXBD4410 FLT signal

UV

EE