IP1842 データシートの表示（PDF） - Semelab - > TT Electronics plc

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IP1842

CURRENT MODE REGULATING PULSE WIDTH MODULATORS

Semelab - > TT Electronics plc  

IP1842 SERIES

IP1843 SERIES

DESCRIPTION

The IP1842 and IP1843 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 UC1842 and 1843 series, SEMELAB has incorporated several improvements in

the IP1842 and IP1843 series allowing tighter and more complete specification of electrical performance.

BLOCK DIAGRAM

7/12

VCC

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

S

VREF STATUS

LATCH

R

7/11 VC

3.6V

OSCILLATOR

6 /1 0

OUTPUT

ERROR

AMP

2R

S

R

1V

R

PWM

LATCH

CURRENT

SENSE

COMPARATOR

Values in brackets are for IP1843 series.

5/8 POW ER

GROUND

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

Operating Ambient Temperature Range

IP1842 , IP1843

IP2842 , IP2843

IP3842 , IP3843

Notes:

1. Lower limit set by under voltage lockout specification.

£ 30V

0 to ±200mA

–0.3V to 3V

0 to 2mA

–55 to 125°C

–25 to 85°C

0 to 70°C

Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612.

E-mail: sales@semelab.co.uk Website: http://www.semelab.co.uk

Prelim.3/00

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