ILA19002 datasheet(8/12 Pages) INTEGRAL

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ILA19002

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FMO

tMAINS

Due to comparator offset, the FMO low to high transition can be occur within a range as

shown above. The time between successive low to high transitions will be equal to the mains

voltage period.

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 ILA19002 integrated circuit are:

R2, 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 16µARMS into the ILA19002 at maximum line

current.

Values for RSH of less than 200µ

Ω should be avoided.

R 1 = R 2 = (I L /16µA)RMS * RSH /2

Where

I L

Line current

RSH =

Shunt resistor/termination resistor

R3, 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 14µARMS.

R7 defines all on-chip bias and reference currents. With R7 = 24kΩ, optimum conditions are

set. R7 may be varied within ±10% for calibration purposes. Any change to R7 will affect the

output quadratically (i.e.: R7 = +5%, fP = +10%).

The formula for calculating the output frequency is given below:

MHz

FOSC

FOUTX

⋅

∗

Where FOUTX = Normal rated frequency (1160Hz)

FOSC

= Oscillator frequency (2MHz ...... 4MHz)

ILA19002 Datasheet(PDF) 8 Page - Integral Corp.

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