L4977A datasheet(8/21 Pages) STMICROELECTRONICS

8 / 21 page

ELECTRICAL CHARACTERISTICS (continued)

RESET AND POWER FAIL FUNCTIONS

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Fig.

V11R

Rising Threshold Voltage

(pin 11)

Vi = 15 to 50V

V3 = 5.3V

Vref

–120

Vref

–100

Vref

–80

V11F

Falling Threshold Voltage

(pin 11)

Vi = 15 to 50V

V3 = 5.3V

4.77

Vref

–200

Vref

–160

V5H

Delay High Threshold

Voltage

Vi = 15 to 50V

V11 =V14

V3 = 5.3V

4.95

5.1

5.25

V5L

Delay Low Threshold

Voltage

Vi = 15 to 50V

V11 =V14

V3 = 5.3V

1.1

1.2

–I5SO

Delay Source Current

V3 = 5.3V; V5 =3V

µA7D

I5SI

Delay Sink Current

V3 = 4.7V; V5 =3V

V4S

Out Saturation Voltage

I4 = 15mA; S1 = B

V3 = 4.7V

0.4

Output Leak Current

V4 = 50V; S1 = A

V3 = 5.3V

100

µA7D

V3R

Rising Threshold Voltage

V11 =V14

4.95

5.1

5.25

V3H

Hysteresys

0.4

0.5

0.6

Input Bias Current

µA7D

Figure 5: Test and Evaluation Board Circuit

TYPICAL PERFORMANCES (using evaluation board) :

n = 83% (Vi = 35V ; Vo =VREF ;Io =7A ; fSW = 200KHz)

Vo RIPPLE = 30mV (at 7A) with output filter capacitor ESR

≤ 60mΩ

Line regulation = 5mV (Vi = 15 to 50V)

Load regulation = 15mV (Io = 2 to 7A)

For component values, refer to test circuit part list.

L4977A

8/21

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