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| 型号： | IR22771SPBF |
| 厂商： | International Rectifier |
| 文件页数： | 13/16页 |
| 文件大小： | 441K |
| 描述： | IC CURRENT SENSE 16SOIC |
| 标准包装： | 45 |
| 功能： | 电流感应 |
| 输入电压： | 8 V ~ 20 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 管件 |
IR22771S/IR21771S(PbF)
13
www.irf.com
For this particular PWM scheme another suitable
solution is driving the IR2x771 with a half frequency
SYNC signal (f
SYNC
=f
PWM
/2).
In this case the cut frequency of the input filter is
reduced by half allowing zeroes to be put at f
PWM
multiples (i.e. even and odd harmonics cancellation,
no more computational effort needed by the
controller).
Figure 15: Even harmonic cancellation principle
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.
G0 and G1 do not affect the overall current sensor
gain.
f
PWM
G0 G1
> 16 kHz *
V
B
V
B
16 / 10 kHz
V
S
V
B
10 / 6 kHz
V
B
V
S
< 6 kHz
V
S
V
S
* 40 kHz
Table 1: G0, G1 gain settings
Triangular
Phase voltage
Phase current
Current Mean
Fundamental
harmonic
Fundamental
harmonic
Switching level
Third
harmonic
Third
harmonic
SYNC 1
SYNC 2
Sampling
instant
Sampling
instant
Error
Triangular
Phase voltage
Phase current
Current Mean
Fundamental
harmonic
Fundamental
harmonic
Switching level
Third
harmonic
Stage 1 input:
Input signal
components
(1
st
and 2
nd
harmonic only)
Third
harmonic
SYNC 1
SYNC 2
Sampling
instant
Sampling
instant
Error
Stage 1
output
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