SKHI24 Datasheet, PDF (7/8 Pages) Semikron International – Hybrid Dual IGBT Driver

SKM 100GB173D
SKM 150GB173D
SKM 200GB173D
12 12 470 36
1
10 10 470 36
1
8,2 8,2 470 36
1
Fig. 4 Typical values for external components
A typical interlocking time value is 3,25 µs (P14 = GND;
P13 and P15 open).
ATTENTION: If the terminals TDT1, TDT2 and SELECT
are not connected, eventually connected track on
PC-board may not be longer than 20 mm in order to avoid
interference.
Fig. 5 shows the recommended maximum switching
frequencies for SEMIKRON Semitrans IGBT modules.
1600
Ra
ted ¹⁴⁰⁰
IG
BT ¹²⁰⁰
Cu
rre ¹⁰⁰⁰
nt
@ ⁸⁰⁰
25
°C 600
/A
m 400
pe
re ₂₀₀
0
0
SKHI24 Recommended Application Range
600V
1200V
1700V
5
10
15
20
25
30
35
f/kHz
SEMIKRON recommends to start-up operation using the
values recommended by SEMIKRON and to optimize the
values gradually according to the IGBT switching
behaviour and overvoltage peaks within the specific
circuitry.
Driver performance and application limits
The drivers are designed for application with halfbridges
and single modules with a maximum gate charge Q_GE <
5 µC.
The charge necessary to switch the IGBT is mainly
depending on the IGBT's chip size, the DC-link voltage
and the gate voltage.
This correlation is also shown in the corresponding
module datasheet curves.
Fig. 5 Maximum switching frequency in dependence of
rated current @ 25°C heatsink temperature.
Further application notes
The CMOS-inputs of the hybrid driver are extremely
sensitive to overvoltage. Voltages higher than V_S + 0,3 V
or below – 0,3 V may destroy these inputs. Therefore,
control signal overvoltages exceeding the above values
have to be avoided.
Please provide for static discharge protection during
handling. As long as the hybrid driver is not completely
assembled, the input terminals have to be short-circuited.
Persons working with CMOS-devices have to wear a
grounded bracelet. Any synthetic floor coverings must not
be statically chargeable. Even during transportation the
input terminals have to be short-circuited using, for
example, conductive rubber. Worktables have to be
grounded. The same safety requirements apply to
MOSFET- and IGBT-modules!
It should, however, be considered that the SKHI 24 is
turned on at + 15 V and turned off at – 8 V. Therefore, the
gate voltage will change by 23 V during each switching
cycle.
Unfortunately, most datasheets do not indicate negative
gate voltages. In order to determine the required charge,
the upper leg of the charge curve may be prolonged to
+ 23 V for an approximately determination of
approximate charge per switch.
The medium output current of the driver is determined by
the switching frequency and the gate charge. For the SKHI
24 the maximum medium output current is Iout_AVmax < ± 80
mA.
The maximum switching frequency f_MAX may be calculated
with the following formula, the maximum value however
being 50 kHz due to switching losses:
f_MAX(kHz)
=
----8-----^â‹---1---0---⁴----
Q_GE(nC)
The connecting leads between hybrid driver and the
power module should be as short as possible, the driver
leads should be twisted.
Any parasitic inductances within the DC-link have to be
minimized. Overvoltages may be absorbed by C- or
RCD-snubbers between the main terminals for PLUS and
MINUS of the power module.
When first operating a newly developed circuit,
SEMIKRON recommends to apply low collector voltage
and load current in the beginning and to increase these
values gradually, observing the turn-off behaviour of the
free-wheeling diode and the turn-off voltage spikes
generated accross the IGBT. An oscillographic control will
be necessary. In addition to that the case temperature of
the module has to be monitored. When the circuit works
correctly under rated operation conditions, short-circuit
testing may be done, starting again with low collector
voltage.
It is important to feed any errors back to the control circuit
and to switch off the device immediately in such events.
Repeated turn-on of the IGBT into a short circuit with a
high frequency may destroy the device.
© by SEMIKRON 22-08-2003
Driver Electronic – PCB Drivers 1921