LAB

SEME

IP1844 SERIES

IP1845 SERIES

Prelim. 2/95

CURRENT MODE

REGULATING

PULSE WIDTH

MODULATORS

FEATURES

• Guaranteed ±1% reference voltage tolerance

• Guaranteed ±10% frequency tolerance

• Low start–up current (<500

mA)

• Under voltage lockout with hysteresis

• Output state completely defined for all supply

and input conditions

• Interchangeable with UC1844 and UC1845

series for improved operation

• 500kHz Oscillator operation

250kHz Output operation

+30V

Self limiting

±1A

5

µJ

10mA

1W

10mW/°C

725mW

7.25mW/°C

2W

16mW/°C

–65 to 150°C

+300°C

TOP VIEW

J Package – 8 Pin Ceramic DIP

N Package – 8 Pin Plastic DIP

D-8 Package – 8 Pin Plastic (150) SOIC

1

2

3

4

8

7

6

5

COMP

V

REF

GROUND

OUTPUT

R

V

CC

I

SENSE

V

FB

TOP VIEW

D-14 Package – 14 Pin Plastic (150) SOIC

COMP

V

REF

GROUND

OUTPUT

1

2

3

4

POWER

GROUND

5

6

7

14

13

12

11

10

9

8

N/C

R

I

SENSE

N/C

N/C

N/C

V

CC

V

FB

V

C

Supply Voltage

(low impedance source)

Output Current

Output Energy

(capacitive load)

Analog Inputs

(pins 2 and 3)

Error Amp Output Sink Current

Power Dissipation

J, N Packages

Power Dissipation

D Package

Power Dissipation

J, N Packages

Storage Temperature Range

Lead Temperature

(soldering, 10 seconds)

Part

J–Pack

N–Pack

D–8

D–14

Temp.

Number

8 Pin

8 Pin

8 Pin

14 Pin

Range

IP1844

-55 to +125°C

IP2844

-25 to +85°C

IP3844

0 to +70°C

IP1845

-55 to +125°C

IP2845

-25 to +85°C

IP3845

0 to +70°C

Order Information

Note:

To order, add the package identifier to the

part number.

eg.

IP1844D–14

IP3845J