IRPT2051 International Rectifier Corp., IRPT2051 Datasheet - Page 11

• Manufacturer Part Number: IRPT2051
• Manufacturer: International Rectifier Corp.

CAUTION:
Capacitor Soft Charge
through an NTC. At power-up, the NTC limits the maximum
inrush current to the rated peak input current, though normal line
impedance will impact the inrush insignificantly. During normal
operation, current through the NTC reduces its resistance, hence
reducing its losses. In the event of a brief power loss, the NTC
will not limit the recharge of the bus because its temperature will
not have time to reduce back to ambient.
System Power Supply
half-bridge driver generates V
and protection circuits. It draws its power from the midpoint of
the dc bus, which si regulated to half of the voltage. Both V
and V
cessor controls. Rated output current is the sum of I
through the bootstrap technique, simplifying power supply re-
quirements.
Gate Drive Circuits
monolithig 3-phase HVIC driver. An under voltage circuit
monitors the local power supply voltage. It will set the FAULT
and inhibit the PWM output in the event of a low power condi-
tion to protect the IGBTs from excessive power loss due to low
gate drive.
across the shunt in the negative dc bus, allowing the device to
have nominal gate voltage during short circuit. This will main-
tain the current to a detectable level.
simple bipolar gate drive circuit is used to drive it.
A dc bus capacitor is connected to the rectifier bridge output
A buck converter designed with the IR2152 self-oscillating
Floating power supplies for high side devices are derived
Gate drive for the inverter is implemented with an IR2233
A short circuit buffer power supply counters the voltage drop
The brake IGBT is generally switched at low frequency, so a
D
are available at the control connector toupply micropro-
All control logic is referenced to the negative power bus,
which is live with respect to earth/ground.
CC
(15V) and V
Functional Information
D
(5V) for drive
CC
and I
CC
D
.
System Protections
bus, which detects phase-to-phase and phase-to-earth short cir-
cuits (when current flows from earth to negative bus). The
voltage drop across teh shunt is compared to a pre-set limit and
when the current exceeds the rated nominal value, this protection
is activated. The shunt signal is available to the user on the con-
trol interface as I
this protection circuit, any external connection should be done
through a high impedance buffer stage.
the shunt in the positive bus and an opto-coupler. When fault
current exceeds the rated nominal value, this protection is acti-
vated.
close to the inverter section in the power module. When the sub-
strate temperature exceeds the nominal rated temperature, this
protection is activated.
voltage with a pre-set reference. When the bus voltage exceeds
the nominal rated value, this protection is activated. The attenu-
ated dc bus voltage is available to the user on the control
interface as V
the reference, any external connections should be done through a
high impedance buffer stage.
goes high activating the internal latch of the IR2233. This turns
off all gate outputs to the inverter and acknowledges the FAULT
to the controller.
Trip Reset
SET pin for 2 µs. This should be done only after all inputs,
IN1...IN6, are inactive. The system protections cannot be dis-
abled by tying this pin to N because the fault logic takes
precedence over the reset.
Short circuit is monitored through a shunt in the negative
Earth/ground fault from positive bus to earth is detected to
Over temperature is measured by a thermistor mounted
Over voltage is detected by comparing attenuated dc bus
If any of the protection features are activated, the TRIP signal
The FAULT signal can be removed by pulling down the RE-
FB
. Since this is the same node that is compared to
FB
. Since this is the same node that is used by
IRPT2051
page 11