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參數(shù)資料
| 型號： | MC33153 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Single IGBT Gate Driver(單IGBT門驅(qū)動器) |
| 中文描述： | 單IGBT柵極驅(qū)動器（單IGBT的門驅(qū)動器） |
| 文件頁數(shù)： | 9/15頁 |
| 文件大?。?/td> | 194K |
| 代理商： | MC33153 |
MC33153
http://onsemi.com
9
the IGBT is in the off
state, it will be subjected to changes
in voltage caused by the other devices. This is particularly
a problem when the opposite transistor turns on.
When the lower device is turned on, clearing the upper
diode, the turn
on dv/dt of the lower device appears across
the collector emitter of the upper device. To eliminate
shoot
through currents, it is necessary to provide a low sink
impedance to the device that is in the off
state. In most
applications the turn
off resistor can be made small enough
to hold off the device that is under commutation without
causing excessively fast turn
off speeds.
Figure 30. Using a Single Gate Resistor
Output
V
CC
V
EE
5
V
EE
V
EE
3
R
g
IGBT
Figure 31. Using Separate Resistors
for Turn
On and Turn
Off
Output
V
CC
V
EE
5
V
EE
V
EE
3
R
on
IGBT
R
off
D
off
A negative bias voltage can be used to drive the IGBT into
the off
state. This is a practice carried over from bipolar
Darlington drives and is generally not required for IGBTs.
However, a negative bias will reduce the possibility of
shoot
through. The MC33153 has separate pins for V
EE
and
Kelvin Ground. This permits operation using a +15/
5.0 V
supply.
INTERFACING WITH OPTOISOLATORS
Isolated Input
The MC33153 may be used with an optically isolated
input. The optoisolator can be used to provide level shifting,
and if desired, isolation from ac line voltages. An
optoisolator with a very high dv/dt capability should be
used, such as the Hewlett Packard HCPL4053. The IGBT
gate turn
on resistor should be set large enough to ensure
that the opto’s dv/dt capability is not exceeded. Like most
optoisolators, the HCPL4053 has an active low
open
collector output. Thus, when the LED is on, the output
will be low. The MC33153 has an inverting input pin to
interface directly with an optoisolator using a pull up
resistor. The input may also be interfaced directly to 5.0 V
CMOS logic or a microcontroller.
Optoisolator Output Fault
The MC33153 has an active high fault output. The fault
output may be easily interfaced to an optoisolator. While it
is important that all faults are properly reported, it is equally
important that no false signals are propagated. Again, a high
dv/dt optoisolator should be used.
The LED drive provides a resistor programmable current
of 10 to 20 mA when on, and provides a low impedance path
when off. An active high output, resistor, and small signal
diode provide an excellent LED driver. This circuit is shown
in Figure 32.
Figure 32. Output Fault Optoisolator
Short Circuit
Latch Output
7
V
EE
V
CC
V
EE
Q
UNDERVOLTAGE LOCKOUT
It is desirable to protect an IGBT from insufficient gate
voltage. IGBTs require 15 V on the gate to achieve the rated
on
voltage. At gate voltages below 13 V, the on
voltage
increases dramatically, especially at higher currents. At very
low gate voltages, below 10 V, the IGBT may operate in the
linear region and quickly overheat. Many PWM motor
drives use a bootstrap supply for the upper gate drive. The
UVLO provides protection for the IGBT in case the
bootstrap capacitor discharges.
The MC33153 will typically start up at about 12 V. The
UVLO circuit has about 1.0 V of hysteresis and will disable
the output if the supply voltage falls below about 11 V.
PROTECTION CIRCUITRY
Desaturation Protection
Bipolar Power circuits have commonly used what is
known as “Desaturation Detection”. This involves
monitoring the collector voltage and turning off the device
if this voltage rises above a certain limit. A bipolar transistor
will only conduct a certain amount of current for a given
base drive. When the base is overdriven, the device is in
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