IR22141 International Rectifier, IR22141 Datasheet - Page 15

• Manufacturer Part Number: IR22141
• Description: HALF-BRIDGE GATE DRIVER IC
• Manufacturer: International Rectifier

The undervoltage on the V
the floating driver. Undervoltage on V
prevent the low side driver to activate its output
nor generate diagnostic signals. V
condition (V
output stage in the low state. V
reestablished higher than UV
normal operating mode. To turn on the floating
driver H
event on H
4.2 Power devices desaturation
Different causes can generate a power inverter
failure: phase and/or rail supply short-circuit,
overload conditions induced by the load, etc…
In all these fault conditions a large current
increase is produced in the IGBT.
The IR2214 fault detection circuit monitors the
IGBT emitter to collector voltage (V
www.irf.com
DesatHS/LS
on/off
IN
must be re-asserted high (rising edge
IN
BS
is required).
< UV
One Shot
tss
VBS-
) latches the high side
BS
works disabling only
P
P
Blanking
r
r
filter
e
e
t
Figure 13: high and low side output stage
t
DS
BL
D
D
r
VBS+
r
i
i
v
v
e
BS
e
ADVANCE DATA
r
r
undervoltage
CE
BS
to return in
) by means
BS
must be
does not
comparator
desat
SHOT
(t
ONE
on
1)
V
DESAT
of an external high voltage diode. High current in
the IGBT may cause the transistor to desaturate,
i.e. V
Once in desaturation, the current in power
transistor can be as high as 10 times the nominal
current. Whenever the transistor is switched off,
this high current generates relevant voltage
transients in the power stage that need to be
smoothed out in order to avoid destruction (by
over-voltages). The IR2214 gate driver accomplish
the transients control by smoothly turning off the
desaturated transistor by means of the SSD pin
activating a so called Soft ShutDown sequence
(SSD).
4.2.1 Desaturation detection: DSH/L function
Figure 13 shows the structure of the desaturation
sensing and soft shutdown block. This configu-
ration is the same for both high and low side
output stages.
CE
to increase.
IR2214/IR22141(SS)
HON/LON
VB/Vcc
SSDH/L
DSH/L
VS/COM
HOP/LOP
sensing
diode
15