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SA9605A 参数 Datasheet PDF下载

SA9605A图片预览
型号: SA9605A
PDF下载: 下载PDF文件 查看货源
内容描述: 三相功率/电能计量与瞬时脉冲输出IC [THREE PHASE POWER/ENERGY METERING IC WITH INSTANTANEOUS PULSE OUTPUT]
分类和应用: 脉冲输出元件
文件页数/大小: 14 页 / 110 K
品牌: SAMES [ SAMES ]
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SA9605A  
The only changes which now have to be implemented to interface the device to different  
rated systems are: change the current sense resistors; and select the required PGM0  
and PGM1.  
No change to the post divider or micro-controller software is required if the FOUT2 pin  
is used as described.  
TYPICAL APPLICATION  
In the Application Circuit (Figure 1), the components required for a three phase power  
metering application are shown.  
Terminated current sensors (current transformers) are connected to the current sensor  
inputs of the SA9605A through current setting resistors (R8 ..R13).  
The resistor values for standard operation are selected for an input current of 16µA into  
the SA9605A, at the rated line current.  
The values of these resistors are calculated as follows:  
Phase 1:  
R8 = R9 = (IL1/16µA) * R18/2  
Phase 2:  
R10 = R11 = (IL2/16µA) * R19/2  
Phase 3:  
R12 = R13 = (IL3/16µA) * R20/2  
Where ILX  
=
=
Secondary CT current at rated conditions.  
R18, R19 and R20  
Current transformer termination resistors for the three phases.  
R1 + R1A, R4 and R15 set the current for the phase 1 voltage sense input. R2 + R2A, R5 +  
P5 andR16 setthecurrentforphase2andR3+R3A,R6 +P6 andR17 setthecurrentforphase  
3. The values should be selected so that the input currents into the voltage sense inputs  
(virtual ground) are set to 14µA for rated line voltage. Capacitors C1, C2 and C3 are for  
decoupling and phase compensation.  
R14 + P14 defines all on-chip bias and reference currents. With R14+ P14 = 24k, optimum  
conditions are set. R14 + P14 may be varied within ± 10% for calibration purposes. Any  
changes to R14 + P14 will affect the output quadratically (i.e: R= +5%, f = +10%).  
The formula for calculating the Output Frequency (f) is given below:  
FOSC  
(II1 IV1) + (II2 IV2) + (II3 IV3)  
f = 11.16  
FOUTX  
*
*
*
2
3.5795MHz  
3 I  
*
R
Where FOUTX = Nominal rated frequency (1160Hz)  
FOSC = Oscillator frequency (2MHz ...... 4MHz)  
II1, I , II3 = Input currents for current inputs (16µA at rated)  
I2  
IV1, IV2, IV3 = Input currents for voltage inputs (14µA at rated)  
IR  
= Reference current (typically 50µA)  
9/14  
sames