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參數(shù)資料
| 型號： | IR21381Q |
| 廠商： | International Rectifier |
| 英文描述： | 3-PHASE AC MOTOR CONTROLLER IC |
| 中文描述： | 3相AC電機控制IC |
| 文件頁數(shù)： | 25/30頁 |
| 文件大小： | 1133K |
| 代理商： | IR21381Q |
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IR22381Q
PBF
/IR21381Q
(
P
b
F
)
25
V
ge
*
10%
t
1
,Q
GE
C
RESoff
C
RESon
V
CE
I
C
V
GE
C
RES
10%
90%
C
RES
t
Don
V
GE
dV/dt
I
C
t
2
,Q
GC
t,Q
t
R
t
SW
Figure 24:
Nomenclature
2.2.1
-
Switching-time
For the matters of the calculation included
hereafter, the switching time t
sw
is defined as the
time spent to reach the end of the plateau voltage
(a total
Q
gc
+
Q
ge
has been provided to the IGBT
gate). To obtain the desired switching time the gate
resistance can be sized starting from
Q
ge
and
Q
gc
,
Vcc
,
V
ge
Q
Q
I
=
Sizing the turn-on gate resistor
(see Figure 25):
sw
ge
gc
avg
t
+
and
avg
ge
TOT
I
V
Vcc
R
*
=
Vcc/Vb
R
DRp
R
Gon
C
RES
COM/Vs
I
avg
Figure 25:
R
Gon
sizing
where
Gon
DRp
TOT
R
R
R
+
=
R
Gon
= gate on-resistor
R
DRp
= driver equivalent on-resistance
IR22381Q/IR21381Q HOP/LOP and HOQ/LOQ
pins can be used to configure gate charge circuit.
Fast turn on can be configured using HOP and LOP
pins (up to t
ON1
switching time).
For slower turn on times HOQ and LOQ can be
used.
Current partitioning can be changed acting on the
output resistors.
In particular, shorting HOP to HOQ and LOP to
LOQ,
R
DRp
is defined by
=
DRp
Vcc
,I
O2+
≤
>
+
+
+
+
1
1
t
on1
1
1
2
1
1
1
on
SW
o
on
SW
on
SW
o
o
SW
on
t
t
when
I
t
t
when
t
t
I
Vcc
I
Vcc
t
t
R
(I
O1+
Characteristics”).
Table 1
reports the gate resistance size for two
commonly used IGBTs (calculation made using
typical datasheet values and assuming Vcc=15V).
-
Output voltage slope
Turn-on gate resistor R
Gon
can be sized to control
output slope
(dV
OUT
/dt)
.
While the output voltage has a non-linear
behaviour, the maximum output slope can be
approximated by:
I
dt
inserting
the
expression
rearranging:
V
Vcc
R
out
RESoff
and
from
“static
Electrical
RESoff
avg
out
C
dV
=
yielding
I
avg
and
dt
dV
C
ge
TOT
=
*
As an example, Table 2 shows the sizing of gate
resistance to get
dV
out
/dt=5V/ns
when using two
popular IGBTs, typical datasheet values and
assuming
Vcc=15V
.
NOTICE
: Turn on time must be lower than T
BL
to
avoid improper desaturation detection and SSD
triggering.
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