TL7700CPWR datasheet(9/17 Pages) TI

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TL7700

SUPPLY VOLTAGE SUPERVISOR

SLVS220C − JULY 1999 − REVISED NOVEMBER 2004

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

TYPICAL CHARACTERISTICS

Figure 17. VCC vs Output Test Circuit 3

VCC

GND

RESET

2.2 k

Ω

30 k

Ω

510 pF

Test

Point 1

240 k

Ω

100 pF

Test

Point 2

SENSE

Figure 18. VCC vs Output Waveform 3

X-Axis = 0.2 ms/Division

TP1

TP2

detailed description

sense-voltage setting

The SENSE terminal input voltage, Vs, of the TL7700 typically is 500 mV. By using two external resistors, the

circuit designer can obtain any sense voltage over 500 mV. In Figure 19, the sensing voltage, Vs’, is calculated

as:

Vs’ = Vs × (R1 + R2)/R2

Where:

Vs = 500 mV, typically at TA = 25°C

At room temperature, Vs has a variation of 500 mV ± 5 mV. In the basic circuit shown in Figure 19, variations

of [

±5 × (R1 + R2)/R2] mV are superimposed on Vs.

VCC

GND

RESET

VCC

RESET

GND

SENSE

Figure 19

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