IG220 datasheet(3/4 Pages) MPD

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Typical Connection

The IG220-xx series is speciﬁcally designed for

use in gate driver circuits. With asymmetrical

outputs of +20 VDC & -4 VDC, an isolation barrier

speciﬁed at 3.5 kVAC, very low isolation capaci-

tance and a wide operating temperature range;

they are an ideal choice for Silicon Carbide (SiC)

MOSFET drive & control circuits.

SiC MOSFETs are often used in high voltage,

very high frequency applications. The figure

above illustrates a typical connection to a driver

circuit. Again, MPD offers a number of power

products that can be used in gate driver circuits

(IGBT and SiC).

The circuit above uses three MPD parts. At the

top, a DC/DC converter is used convert the 24

VDC bus into voltage levels required by the driver

components (if required). This converter also iso-

lates the driver circuit from the power bus. MPD

offers hundreds of standard DC/DC converters

that can be used for this purpose.

The MSR7805-05WUP is a miniature, very low

cost switching regulator. In this circuit, it con-

verts the 24 VDC bus into a regulated 5 VDC that

is used for the input signal pull-up.

7. Recommended values for components are:

Component

12 VIN

15 VIN

24 VIN

4.7 µF/50V

LDM

6.8 µH

4.7 µF/50V

100 µF/35V

The IG220-24 converts the input 24 VDC into

asymmetrical +20 VDC & -4 VDC outputs. These

outputs are used to set up the positive/minus gate

bias required for high and low side switching.

The IG220-24 also provides power isolation for

the gate drive. All models are speciﬁed for 3.5

kVAC I/O isolation. The optocoupler provides

isolation for the control signal.

Some notes on the IG220-xx connection (starting

with the input) are:

1.The IG220-xx DC/DC should be mounted as

close to the SiC driver as possible, to minimize

the length of connecting board traces or wires.

2.The IG220 series does not include overload pro-

tection (typical of most low power DC/DC’s). It

is recommended that an external fuse be used.

The recommended fuse is shown in the model

chart on page two.

3.The addition of the input ﬁlter components (C4,

C5 and LDM) will typically bring the IG220-xx cir-

cuit to within the limits of EN 55022 Class B. The

recommended values for these components are

shown in the table at right.

If meeting EN 55022 class A or B is not a con-

cern, the inductor (LDM) and one capacitor (C4)

can be eliminated.

4.The recommended values for the decoupling

capacitors C6 and C7 are shown in the table

below. These low ESR capacitors should be

mounted as close to the driver circuit as pos-

sible.

5.Input ﬁltering components (C4, C5 and LDM)

should be mounted as close to the unit as pos-

sible. The PC board trace (or wire) between the

DC/DC and the driver circuit should be as short

as possible.

6.The use of tantalum capacitors in this circuit

should be avoided.

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