L4972AD datasheet(9/23 Pages) STMICROELECTRONICS

9 / 23 page

RESET AND POWER FAIL FUNCTIONS

Symbo l

Parameter

T est Co nd iti ons

Mi n.

T yp.

Max.

Unit

Fig .

V9R

Rising Thereshold Voltage

(pin 9)

Vi = 15 to 50V

V4 = 5.3V

Vref

-130

Vref

-100

Vref

-80

V9F

Falling Thereshold Voltage

(pin 9)

Vi = 15 to 50V

V4 = 5.3V

4.77

Vref

-200

Vref

-160

V2H

Delay High Threshold Volt.

Vi = 15 to 50V

V4 = 5.3V V9 =V13

4.95

5.1

5.25

V2L

Delay Low Threshold Volt.

Vi = 15 to 50V

V4 = 4.7V

V9 =V13

1.1

1.2

I2SO

Delay Source Current

V4 = 5.3V;

V2 = 3V

306080

µA7D

I2SI

Delay Source Sink Current

V4 = 4.7V; V2 =3V

V3S

Output Saturation Voltage

I3 = 15mA; S1 = B V4 = 4.7V

0.4

Output Leak Current

V3 = 50V; S1 = A

100

µA7D

V4R

Rising Threshold Voltage

V9 = V13

4.95

5.1

5.25

V4H

Hysteresis

0.4

0.5

0.6

Input Bias Current

µA7D

ELECTRICAL CHARACTERISTICS (continued)

TYPICAL PERFORMANCES (using evaluation board) :

n = 83% (Vi = 35V ; Vo = VREF ; Io =2A; fsw = 100KHz)

Vo RIPPLE = 30mV (at 1A)

Line regulation = 12mV (Vi = 15 to 50V)

Load regulation = 7mV (Io = 0.5 to 2A)

for component values Refer to the fig. 5 (Part list).

L4972A-L4972AD

9/23

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