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IR2277S/IR2177S (PbF)
Switching level
Triangular
Phase voltage
Phase current
Current Mean
Fundamental
harmonic
Third
harmonic
Fundamental
harmonic
Third
harmonic
Stage 1 input:
Input signal
components
(1 st and 2 nd
harmonic only)
Stage 1
output
SYNC 1
Error
SYNC 2
Sampling
instant
Sampling
instant
Figure 19: Even harmonic cancellation principle
1.6 Input filter gain setting
2
Sizing tips
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 connect 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.
G0 and G1 do not affect the overall current sensor
gain.
2.1 Bootstrap supply
The V BS1,2,3 voltage provides the supply to the high
side drivers circuitry of the IR2277S/IR2177S. V BS
supply sit on top of the V S voltage and so it must be
floating.
The bootstrap method to generate V BS supply can
be used with IR2277S/IR2177S current sensors.
The bootstrap supply is formed by a diode and a
capacitor connected as in Figure 20.
f PWM
G0 G1
> 16 kHz * V B
16 / 10 kHz V S
10 / 6 kHz V B
< 6 kHz V S
V B
V B
V S
V S
*
40 kHz
Table 1: G0, G1 gain settings
Figure 20: bootstrap supply schematic
17
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