ST1843 datasheet(6/25 Pages) STMICROELECTRONICS

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Electrical characteristics

ST1843 - ST1845

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Doc ID 019049 Rev 1

Electrical characteristics

Maximum package power dissipation limits must be respected; low duty cycle pulse

techniques are used during test maintain TJ as close to TA as possible.

Unless otherwise stated, these specifications apply for - TA = 22 ±3°C, Vi = 15 V, Adjust Vi

above the start threshold before setting at 15 V; RT = 10 kΩ; CT = 3.3 nF.

Table 5.

Electrical characteristics

Symbol

MIL-STD-

883 test

method

Parameter

Test conditions

Values

Unit

Min.

Max.

Reference section

VREF

Output voltage

VI = 15V

(1); R

T = 10kΩ; CT = 3.3nF,

Io = 1mA

4.95

5.05

ΔV

REF_LINE

Line regulation

12V

≤ V

i ≤ 25V, RT = 10kΩ; CT =

3.3nF

0.02

ΔV

REF_LOAD

Load regulation

VI = 15V

(1); R

T = 10kΩ; CT = 3.3nF,

≤ I

o ≤ 20mA

ISC

3011

Output short circuit

-0.18 -0.03

Oscillator section

fOSC

Frequency for ST1843

VI = 15V

(1); R

T = 10kΩ; CT = 3.3nF,

≤ I

o ≤ 20mA

kHz

Frequency for ST1845

24.5

27.5

kHz

Δf

OSC/ΔV

Frequency change with

voltage

12V

≤ V

I ≤ 25V; RT = 10kΩ; CT =

3.3nF

–

Idischg

Discharge current

VI = 15V

(1); R

T = 10kΩ; CT = 3.3nF,

≤ I

o ≤ 20mA, VOSC = 2V

7.8

7.5

8.8

Error amp section

Input voltage

VI = 15V

(1); R

T = 10kΩ; CT = 3.3nF,

VPIN1 = 2.5V

2.45

2.55

4001

Input bias current

VI = 15V

(1); R

T = 10kΩ; CT = 3.3nF,

VFB = 5V

-1

AVOL

VI = 15V

(1); R

T = 10kΩ; CT = 3.3nF,

≤ V

o ≤ 4V

PSRR

4003

Power supply rejec. ratio

12V

≤ V

i ≤ 25V; RT = 10kΩ; CT =

3.3nF

Io_sink

Output sink current

VI = 15V

(1); R

T = 10kΩ; CT = 3.3nF,

VPIN2 = 2.7V, VPIN1 = 1.1V

2mA

Io_source

Output source current

VI = 15V

(1); R

T = 10kΩ; CT = 3.3nF,

VPIN2 = 2.2V, VPIN1 = 5V

-0.5

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