IR2214 Просмотр технического описания (PDF) - International Rectifier
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IR2214 Datasheet PDF : 28 Pages
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ADVANCE DATA IR2214/IR22141(SS)
The undervoltage on the VBS works disabling only
the floating driver. Undervoltage on VBS does not
prevent the low side driver to activate its output
nor generate diagnostic signals. VBS undervoltage
condition (VBS < UVVBS-) latches the high side
output stage in the low state. VBS must be
reestablished higher than UVVBS+ to return in
normal operating mode. To turn on the floating
driver HIN must be re-asserted high (rising edge
event on HIN is required).
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 (VCE) by means
of an external high voltage diode. High current in
the IGBT may cause the transistor to desaturate,
i.e. VCE to increase.
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.
on/off
DesatHS/LS
tss
One Shot
PreDriver
tBL
Blanking
tDS
filter
ONE
SHOT
(ton1)
desat
comparator
VDESAT
VB/Vcc
HOP/LOP
HON/LON
SSDH/L
sensing
diode
DSH/L
VS/COM
Figure 13: high and low side output stage
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