參數(shù)資料
型號(hào)： IR22771STRPBF
廠商： International Rectifier
文件頁數(shù)： 12/16頁
文件大?。?/td> 441K
描述： IC CURRENT SENSE 16SOIC
標(biāo)準(zhǔn)包裝： 500
功能： 電流感應(yīng)
輸入電壓： 8 V ~ 20 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 16-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 16-SOIC
包裝： 帶卷 (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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