IP1842AJ Ver la hoja de datos (PDF) - Semelab - > TT Electronics plc

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componentes Descripción

Fabricante

IP1842AJ

CURRENT MODE REGULATING PULSE WIDTH MODULATORS

Semelab - > TT Electronics plc  

SEME

LAB

IP1842A SERIES

IP1843A SERIES

DESCRIPTION

The IP1842A/IP1843A series of switching regulator control circuits contain all the functions necessary to

implement off-line, current mode switching regulators, using a minimum number of external parts. Functions

included are voltage reference, error amplifier, current sense comparator, oscillator, totem-pole output driver and

under-voltage lockout circuitry.

Although pin compatible with the standard IP1842/3 parts these devices offer improved performance in several

areas. They also offer tighter specification and improved performance over the IP and UC1842/3 series, whilst

retaining complete compatibility.

BLOCK DIAGRAM

VCC7/12

GND 5/9

R T /CT 4/7

VFB 2/3

COMP 1/1

ISENSE 3/5

34V

16V

(8.4V)

UNDER–VOLTAGE

LOCKOUT

ENABLE

REFERENCE 5V

REGULATOR

6V

(0.5V) 2.5V

REG

INTERNAL

BIAS

8/14 VREF

OSCILLATOR

ERROR

AMP

2R

R

S

VREF STATUS

LATCH

R

7/11 VC

3.6V

6 /1 0

OUTPUT

Q

T

TOGGLE

FLIP

FLOP *

5/8 POW ER

GROUND

S

1V

R

PWM

LATCH * 1844A and 1845A series only.

CURRENT

Values in brackets are for IP1845 series.

SENSE

COMPARATOR

PIN NUMBERS

1st Number – N, J and 8 Pin D Packages

2nd Num ber – 14 Pin D Package.

RECOMMENDED OPERATING CONDITIONS

VCC

Supply Voltage 1

IO

Output Current

Analog Inputs

(pins 2 and 3)

Error Amp Output Sink Current

Notes:

Operating Ambient Temperature Range

IP1842A , IP1843A

IP2842A , IP2843A

IP3842A , IP3843A

1. Lower limit set by under voltage lockout specification.

Semelab plc. Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.

≤ 30V

0 to ±200mA

–0.3V to 3V

0 to 2mA

–55 to 125°C

–25 to 85°C

0 to 70°C

Prelim. 2/95

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