参数资料
型号: IR21771STRPBF
厂商: International Rectifier
文件页数: 12/16页
文件大小: 441K
描述: IC CURRENT SENSE 16SOIC
标准包装: 500
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: 带卷 (TR)
 
 
IR22771S/IR21771S(PbF) 
12
      www.irf.com
 
 
Figure 13: Simplified block diagram 
 
Figure 14: Input filter transfer function (10 kHz PWM) 
 
The second stage samples the result of the first
stage at double Sync frequency. This action can be
used to fully remove the odd harmonics from the
input signal.
To perform this cancellation it is necessary a shift of
90 degrees of the SYNC signal with respect to the
triangular carrier edges (SYNC2).
The following timing diagrams show the principle of
odd harmonics cancellation (Figure 15), in which
SYNC2 allows the sampling of stage 1 output
during odd harmonic zero crossings.
Odd harmonic cancellation using SYNC2 (i.e. 90
degrees shifted SYNC signal) signal will introduce
Tsync/4 additional propagation delay.
 
Another way to obtain the same result (odd
harmonics   cancellation)   can   be   achieved   by
controller computing the average of two consecutive
PO results using SYNC1 (SYNC is in this case
aligned to triangular edges, i.e. 0 degree shift).
This method is suitable for most symmetric (center
aligned) PWM schemes.
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