TLV7031 datasheet(26/69 Pages) TI2

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At this time the comparator output trips pulling down the output to the negative rail. The value of VA at this point

is calculated by Equation 8.

A 2

(R IIR )

R + R IIR

(8)

If R1 = R2 = R3, then VA2 = VCC/3

The C1 now discharges though the R4, and the voltage VCC decreases until reaching VA2. At this point, the

output switches back to the starting state. The oscillation period equals the time duration from 2VCC / 3 to VCC / 3

then back to 2VCC / 3, which is given by R4C1 × ln2 for each trip. Therefore, the total time duration is calculated

as 2R4C1 × ln2. The oscillation frequency can be obtained by Equation 9:

1 / 2 R 4

C1 I n2

(9)

7.2.3.3 Application Curve

Figure 7-9 shows the simulated results of an oscillator using the following component values:

• R1 = R2 = R3 = R4 = 100kΩ

• C1 = 100pF, CL = 20pF

• V+ = 5V, V– = GND

• Cstray (not shown) from VA to GND = 10pF

Figure 7-9. Square-Wave Oscillator Output Waveform

TLV7031, TLV7032, TLV7041, TLV7042, TLV7034, TLV7044

SLVSE13J – SEPTEMBER 2017 – REVISED NOVEMBER 2024

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TLV7031 Datasheet(PDF) 26 Page - Texas Instruments