IXBD4410PI datasheet(11/11 Pages) IXYS

11 / 11 page

IXBD4410

IXBD4411

Fig. 11: Ferrite bead dimensions

Fig. 12: Transmitter/Receiver Waveforms

DS96528E(05/04)

The nominal electrical specifications of

the transformer are as follows:

Open circuit inductance

(100 kHz; 20 mV):

µH

Interwinding capacitance:

2 pF

Primary leakage inductance: 0.1

µH

Turns ratio:

6:2

Primary-to-secondary isolation

(1min):

1500 V~

Core permeability (

i):

125

The recommended ferrite bead is Fair

Rite Products part number 2661000101,

which is manufactured by:

Fair-Rite Products Corp.

Wallkill, NY

Phone: (800) 836-0427

Web site: www.fair-rite.com

As seen in the application drawings

(Fig. 6, 9 and 12) a coupling capacitor

(22 nF) and a damping resistor (22

Ω)

are added in series with the primary

side of the transformer. The capacitor

will control the small amount of energy

needed to transfer the signal to the

companion driver. The resistor will

control the damping of the signal and

limit the peak transmitter output current.

The receiver is designed to operate

over a wide common mode input range.

To reduce noise pickup, the receiver

has

±250 mV of input hysteresis.

If the signal is being distorted at the

transmitter, the transmitter is probably

running into current limit. A decrease in

the coupling capacitance or an increase

in the damping resistance should solve

this problem. The receiver operates

over a wide input range. The minimum

amplitude for one side of the receiver is

about 1 V and a maximum of about 3 V.

It is critical that there be no overshoot

on the transformer secondary wave-

form. Each signal should be slightly

overdamped. If significant overshoot

exists, the received signal may be

logically inverted. An increase of the

damping resistor will solve this problem.

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