L4938EP datasheet(9/20 Pages) STMICROELECTRONICS

9 / 20 page

L4938ED, L4938EPD

Electrical specifications

Doc ID 17243 Rev 2

9/20

Table 7.

OUT1, OUT2

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

VOLi 1,2

Line regulation

VS = 6 to 28 V; IO1 = 1 mA,

IO2 = 5 mA,

(after regulation setting)

Table 8.

Enable input

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

VENL

Enable input low voltage

(output 2 active)

-20

VENH

Enable input high voltage

1.4

VENhyst

Enable hysteresis

IEN LOW

Enable input current low

VEN = 0

-20

-8

-3

µA

IEN HIGH

Enable input current high

VEN = 1.1 to 7 V;

TJ < 130 °C;

-1

µA

VEN = 1.1 to 7 V;

TJ = 130 to 150 °C;

-10

µA

Table 9.

Reset circuit

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

VRT

Reset threshold voltage(1)

The reset threshold can be programmed continuously from typ 3.8 V to 4.7 V by changing a value of an

external resistor from pin PR to GND.

RPR = ∞

4.5

VO1-

0.3

VO1-

0.2

RPR = 0

3.65

3.8

3.95

VRTH

Reset threshold hysteresis

RPR = ∞

120

tRD min

Reset pulse delay

CRES = 47 nF; t r ≤ 30 µs

(2)

This is a minimum reset time according to the hysteresis of the comparator. Delay time starts with VOUT1

exceeding VRT.

100

tRD nom

Reset pulse delay

CRES = 47 nF

(3)

This is the nominal reset time depending on the discharging limit of CT (saturation voltage) and the upper

threshold of the timer comparator. Delay time starts with VOUT1 exceeding VRT.

100

140

tRR

Reset reaction time

CRES = 47 nF

150

µs

ICT

Pull down capability of the

discharge circuit

VOUT1 < VRT

ICT

Charge current

VOUT1 > VRT

-1.3

-1

0.7

µA

VRESL

Reset output low voltage

RRES = 10 KΩ to VOUT1

VOUT1 ≥ 1.5 V

0.4

VRESH

Reset output high leakage

current

VRES = 5 V

µA

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