INT201
HV+
8
7
6
5
D3
R2
PHASE 2
C2
INT201
Q2
D1
1
8
2
3
4
5
3-PHASE
SRM
V
DD
7
6
PHASE 1
PHASE 3
C1
INT202
CONTROL
HV-
Q1
1
2
3
4
R1
D2
PI-1468-042695
Figure 6. Using the INT202 and INT201 to Drive a Switched Reluctance Motor.
General Circuit Operation (cont.)
The bootstrap capacitor must be large
enough to provide bias current over the
entire on time interval of the high-side
driver without significant voltage sag or
decay. The MOSFET gate charge must
also be supplied at the desired switching
frequency. Figure5showsthemaximum
high-side on time versus gate charge of
the external MOSFET. Applications
controls MOSFET Q1. Unlike the
INT200, the INT202 allows both the
low and high-side drivers to be on at the
same time, as this is required in
applications where the load is placed
between the low and high-side output
MOSFETs.
with extremely long high-side on times
require special techniques discussed in
AN-10.
Athree-phaseswitchedreluctancemotor
example using the INT202/201 is given
in Figure 6. The LS IN signal directly
F
2/96
4
POWERINT [ Power Integrations ]
