M57161L-01

Powerex, Inc., 200 E. Hillis Street, Youngwood, Pennsylvania 15697-1800 (724) 925-7272

M57161L-01

Hybrid IC for IGBT Gate Driver

6

sufficiently high ripple current rating.

Theexample circuit inFigure5uses

a

150µF

low

impedance

type

electrolytic for the input decoupling

capacitor.

The

driver’s

built-in

DC-DC

converter produces isolated +17.4V

and -6.5V outputs at pins 19 and 17

with respect to the common pin 18.

These

voltages

are

supplied

to

driver’s output stage on pins 22 and

24 to provide high current gate drive

with on and off driving voltages of

+15.5V and –5V. In order to deliver

the pulse current necessary for efficient switching, the output of the isolated DC-DC converter (pins 17, 18 and 19)

must be decoupled using a combination of low impedance electrolytic and film capacitors. In Figure 5 the 150µF

low impedance electrolytics and a 2.2µF stacked film or multi-layer ceramic are included for this purpose. These

capacitors should be located as close as possible to the pins of the hybrid gate driver.

When driving small

modules it is usually acceptable to use smaller capacitors provided that that they have sufficient ripple current

capability and low enough impedance. However, very large modules and parallel module applications may require

500µF or more to achieve low enough impedance and high enough ripple current capability.

The back-to-back zener diodes from G to E that are normally recommended are not required with F-Series IGBT

modules because they are included as part of the modules internal RTC circuit.

Pin 28 is used to adjust the RTC detection time and total shut-down time. This adjustment was described in

be located as close as possible to the pins of the gate driver.

Pin 27 is an active low fault status signal. When a fault (short circuit or undervoltage) is detected this pin is

feedback signal. The optocoupler is connected from the common of the isolated power supply (pin 18) to the fault

signal pin using a 470

Ω current limiting resistor. When a fault occurs a current of approximately 10mA will flow in

the optocoupler’s LED. A 3.3k

Ω resistor connected across the opto’s photodiode helps to improve noise immunity.

6. Control Power Supply Requirements

The control power supply current

required for the M57161L-01 is primarily a

IGBT

module

being

driven

and

the

switching frequency.

Figure 6 shows the

function of IGBT module gate charge for

various switching frequencies. This curve

provides

an

estimate of

the

required

current.

The actual current will vary

depending on the operating conditions of

the IGBT module. To accommodate these

variations, it is recommended that the 15V

supply be designed to provide 150% - 200% of the value indicated in Figure 6.

Figure 5 M57161L-01 Typical Application Circuit

M57161L-01

150

µF

+

+

1

6

24

22

17

19

+

RTC

29

27

+

FO

+

150

µF

2.2

µF

150

µF

G

E

IGBT Module

3.3k

470

Ω

-

Figure 6 Supply Current versus Gate Charge

0

100

200

300

400

500

0

2

468

10

5kHz

10 kHz

15 kHz

20 kHz