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SA9602HPA Datasheet(PDF) 8 Page - Sames |
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SA9602HPA Datasheet(HTML) 8 Page - Sames |
8 / 14 page SA9602H 8/14 sames R 3, R6 and R4 set the current for the voltage sense input. The values should be selected so that the input current into the voltage sense input (virtual ground) is set to 14µA RMS. R 7 defines all on-chip bias and reference currents. With R7 = 24kΩ, optimum conditions are set. R 7 may be varied within ±10% for calibration purposes. Any change to R7 will affect the output quadratically (i.e.: R 7 = +5%, fP = +10%). The formula for calculating the output frequency is given below: f = 11.16 * FOUTX * FOSC * I I .IV 3.58MHz I R 2 Where FOUTX = Normal rated frequency (1160Hz) FOSC = Oscillator frequency (2MHz ...... 4MHz) I I = Input current for current input (16µA RMS at rated) I V = Input current for voltage input (14µA RMS at rated) I R = Reference current (typically 50µA) XTAL is a colour burst TV crystal (f = 3.5795 MHz) for the oscillator. The oscillator frequency is divided down to 1.7897 MHz on-chip, to supply the digital circuitry and the A/ D converters. TYPICAL APPLICATIONS In the Application Circuits (Figures 1 and 2), the components required for power metering applications, are shown. In Figure 1 a shunt resistor is used for current sensing. In this application, the circuitry requires a +2.5V, 0V, -2.5V DC supply. In the case of Figure 2, when using a current transformer for current sensing, a +5V, 0V DC supply is sufficient. The most important external components for the SA9602H integrated circuit are: R 2, R1 and RSH are the resistors defining the current level into the current sense input. The values should be selected for an input current of 16µA RMS into the SA9602H at maximum line current. Values for RSH of less than 200µ Ω should be avoided. R 1 = R2 = (IL/16µA)RMS * RSH/2 Where I L = Line current RSH = Shunt resistor/termination resistor |
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