IHD215 CT-Concept Technologie AG, IHD215 Datasheet - Page 10

• Manufacturer Part Number: IHD215
• Description: Intelligent Half-bridge Drivers For Igbts And Power Mosfets
• Manufacturer: CT-Concept Technologie AG

IHD 215/280/680
Data Sheet & Application Manual
The leads IN1+ and IN1- must run in
parallel and be well coupled (parallel
tracks or twisted pairs).
The minus leads must always be run back
separately for both channels to the input
driver so that reliable operation can be
ensured (see Fig. 3).
Whereas reliable transmission is no
problem in the case of very long pulses,
the entire configuration must be checked
with a view to very short drive pulses:
although many level shifters and most
driver ICs generate a fast and distortion-
free turn-on edge at such short pulses (less
than 100 ns), the turn-off edge that fol-
lows shortly afterwards may be distorted
or slowed down. In such a case, a driver
may be turned on by a short pulse but
may not turn off again due to the distorted
turn-off edge. The input driver upstream
of the IHD must thus be optimized to
ensure that the turn-off edge is always just
as fast and distortion-free - especially with
short pulses - as the turn-on edge. In
(digital) systems that intrinsically preclude
the occurrence of drive pulses shorter than
about 200 ns, this operating case need
not be specially checked.
Page 10
Fig. 3 Correct input driver wiring
I n t e r n e t :
w w w . C T - C O N C E P T . c o m
Pin 1 and 2 pin 15 and
16 : Outputs SO1+ and
SO1- SO2+ and SO2-
The outputs SO1+ and SO1- are used for
the status acknowledgment. These are the
collector (SO1+) and emitter (SO1-) of an
opto-coupler
switched state of this transistor corre-
sponds to an “everything OK“ message. If
the voltage supply is too low or the pro-
tective function is activated, the transistor
opens (see Fig. 4). The outputs are
designed for an operating current of 1
mA. Despite electrical isolation with
respect to all other contact pins, these out-
puts can be used exclusively at the poten-
tial of the control side ( 50V difference to
the drive signal), as there is only a mini-
mum distance to the terminals of the
inputs IN1+ and IN1-.
The capacitive coupling between transmit-
ter and receiver in the optocoupler means
that under certain conditions short spikes
may occur at the outputs SO1/SO2 due
to high level jumps of the power
transistors. It is therefore recommended to
connect an RC network with a time
transistor.
constant of about 5...10
microseconds after
status outputs.
It is further recommended
not to hardwire two or
more status acknowledg-
ment outputs but to feed
their individual signals to
the monitoring electron-
ics. This simplifies diag-
nosis and troubleshooting
in the event of errors to a
very decisive degree.
The
through-
the