IR22771S International Rectifier, IR22771S Datasheet - Page 13
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IR22771S
Manufacturer Part Number
IR22771S
Description
1200V Phase Current Sensing IC for AC Motor Control in a 16-Lead SOIC package
Manufacturer
International Rectifier
Datasheet
1.IR22771S.pdf
(16 pages)
Specifications of IR22771S
Family Hvic
General Purpose HVICs
Channels
1
Topology
Current Sense
Application
General Purpose / Motor Control
Voffset
1200
Over Current Protection
Yes
Package
16 Lead
Part Status
Active & Preferred
For this particular PWM scheme another suitable
solution is driving the IR2x771 with a half frequency
SYNC signal (f
In this case the cut frequency of the input filter is
1.6 Input filter gain setting
G0 and G1 pins are used to change the time
constant of the integrators of the high side input
filter.
To avoid internal saturation of the input filter, G0
and G1 must be connected according to SYNC
frequency as shown in Table 1. A too small time
constant may saturate the internal integrator, while
a large time constant may reduce accuracy.
13
SYNC
=f
PWM
/2).
Figure 15: Even harmonic cancellation principle
reduced by half allowing zeroes to be put at f
multiples (i.e. even and odd harmonics cancellation,
no more computational effort needed by the
controller).
G0 and G1 do not affect the overall current sensor
gain.
Third
Third
Third
Third
harmonic
harmonic
harmonic
harmonic
harmonic
harmonic
harmonic
harmonic
SYNC 1
SYNC 1
SYNC 2
SYNC 2
Phase voltage
Phase voltage
Phase current
Phase current
Current Mean
Current Mean
Fundamental
Fundamental
Fundamental
Fundamental
Switching level
Switching level
IR22771S/IR21771S(PbF)
Triangular
Triangular
Error
Error
*
Table 1: G0, G1 gain settings
f
> 16 kHz *
16 / 10 kHz
10 / 6 kHz
< 6 kHz
PWM
40 kHz
instant
instant
instant
instant
Sampling
Sampling
Sampling
Sampling
harmonic only)
Stage 1 input:
Input signal
components
(1
Stage 1
st
output
and 2
nd
www.irf.com
G0
V
V
V
V
B
S
B
S
G1
V
V
V
V
B
B
S
S
PWM