IRS2336D International Rectifier Corp., IRS2336D Datasheet - Page 28

• Manufacturer Part Number: IRS2336D
• Description: High Voltage 3 Phase Gate Driver Ic
• Manufacturer: International Rectifier Corp.

The difference between the PW
Figure 21; the careful reader will note the scale of the y-axis. The x-axis of Figure 21 shows the duration of PW
while the y-axis shows the resulting PW
of this input filter.
Integrated Bootstrap Functionality
The new IRS2336xD family features integrated high-voltage bootstrap MOSFETs that eliminate the need of the
external bootstrap diodes and resistors in many applications.
There is one bootstrap MOSFET for each high-side output channel and it is connected between the V
its respective floating supply (i.e., V
The integrated bootstrap MOSFET is turned on only during the time when LO is ‘high’, and it has a limited source
current due to R
C
wheeling diode drop.
The bootstrap MOSFET of each channel follows the state of the respective low-side output stage (i.e., the bootstrap
MOSFET is ON when LO is high, it is OFF when LO is low), unless the V
110% of V
concept is illustrated in Figure 23.
BS
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1000
capacitor, the drain-source (collector-emitter) drop of the external IGBT (or MOSFET), and the low-side free-
800
600
400
200
120
100
80
60
40
20
0
0
0
0
CC
. In that case, the bootstrap MOSFET is designed to remain off until V
Filtered
Short
Pulse
PW
PW
BS
200
200
OUT
IN
. The V
Figure 21: Difference between the input pulse and the output pulse
Narrow Pulse ON
Narrow Pulse ON
BS
400
400
voltage will be charged each cycle depending on the on-time of LO and the value of the
Time (ns)
Time (ns)
OUT
Figure 20: IRS2336xD input filter characteristic
B1
600
600
and PW
, V
OUT
B2
, V
–PW
B3
IN
800
800
); see Figure 22 for an illustration of this internal connection.
signals of both the narrow ON and narrow OFF cases is shown in
IN
PW
duration. This data illustrates the performance and near symmetry
OUT
-PW
1000
1000
IN
28
120
100
80
60
40
20
1000
800
600
400
200
0
0
0
0
Filtered
Short
Pulse
PW
PW
200
OUT
IN
200
B
voltage is higher than approximately
IRS2336xD Family
B
Narrow Pulse OFF
Narrow Pulse OFF
returns below that threshold; this
400
400
Time (ns)
Time (ns)
© 2008 International Rectifier
600
600
CC
800
800
supply and
PW
OUT
-PW
1000
1000
IN
IN
,