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SA4106ASAR Datasheet(PDF) 9 Page - Sames |
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SA4106ASAR Datasheet(HTML) 9 Page - Sames |
9 / 18 page SPEC-1587 (REV. 5) 9/18 29-09-2017 SA4106A INPUT SIGNALS Voltage Reference (VREF) A bias resistor of 47k sets optimum bias and reference conditions on chip. Calibration of the SA4106A should be done on the voltage input and not on the VREF input. Current Sense Inputs (IIP and IIN) Figure 7 shows the typical connections for the current sensor input when using a shunt or a current transformer as a current sensing element. At maximum rated mains current (IMAX) the resistor values should be selected for an input current of 16µARMS. The current sense inputs saturate at an input current of ±17.6μARMS (±25μAPEAK), so this allows about 10% headroom until saturation occurs. The resistor RSH is the shunt resistor. The voltage drop across RSH at maximum rated mains current (IMAX) should not be less than 5mVRMS and not exceed 100mVRMS. The resistors RA and RB form the current transformers termination resistor. The reference level is connected in the centre of the termination resistor to achieve purely differential input currents. The voltage drop across the termination resistors at maximum rated mains current (IMAX) should be in the order of 100mVRMS. The termination resistance should also be significantly smaller than the DC resistance of the current transformers secondary winding. The resistors R1 to R4 define the current flowing into the device. For best performance the SA4106A requires anti- alias filters on the current sense inputs. These filters are realized by means of the capacitors C1 and C2. The typical cut-off frequency of these filters should be between 10kHz and 20kHz. The optimum input network is achieved by setting the input resistors equal, i.e. setting R1 = R2 = R3 = R4 = RC. This sets the equivalent resistance associated with each capacitor to RC/2. Figure 7: Current sense input configuration Voltage Sense Input (IVP) Figure 8 shows the voltage sense input configuration. The voltage sense input saturates at an input current of ±17.6μARMS (±25μAPEAK). The current into the voltage sense input should therefore be set between 11μARMS and 12μARMS at nominal mains voltage (VNOM) to allow for a mains voltage variation of up to +30% and –50% without saturating the voltage sense input. Typical VNOM values and the corresponding IVP input currents are shown in the following table. Table 1: IVP input current for typical values of VNOM VNOM (V) IVP Input Current (μARMS) 110 / 220 11 115 / 230 11.5 120 / 240 12 For best performance the SA4106A also requires an anti- alias filter on the voltage sense input. Referring to Figure 8, the capacitor C1 is used to implement the anti-alias filter. If a current transformer is used as a current sensing element then C1 is also used to compensate for any phase shift caused by the current transformer. The resistor R4 defines the input current into the device. The optimum input network is achieved by setting R4 smaller than 100k . If R4 is made too large the capacitor C1 will be very small and the phase shift of the input network could be affected by stray capacitances. The potentiometer P1 is used for calibration purposes. Figure 8: Voltage sense input configuration R3 R1 IIN IIP GND Current In I MAX 16µA RMS R4 R2 Current Out GND GND C1 C2 R3 R1 RA IIN IIP GND CT1 Current In I MAX 16µA RMS R4 R2 RB Current Out C1 C2 RSH R4 R3 IVP GND C1 R2 R1 GND V NOM (220V) (11µA RMS) Voltage In Neutral GND R5 P1 (P1 + R5) << R4 << (R1 + R2 + R3) |
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