Semelab Plc IP3842D, IP3842AN-200, IP3842AN, IP3842AD-8, IP3842AD-14 Datasheet

V

CC

Supply Voltage (low impedance source)

(ICC< 30mA)

I

O

Output Current
Output Energy (capacitive load)
Analog Inputs (pins 2 and 3)
Error Amp Output Sink Current

P

D

Power Dissipation T

amb

= 25°C J, N Packages

Derate @ T

amb

> 50°C

P

D

Power Dissipation T

case

= 25°C D Package

Derate @ T

amb

> 50°C

P

D

Power Dissipation T

case

= 25°C J, N Packages

Derate @ T

case

> 25°C

T

STG

Storage Temperature Range

T

L

Lead Temperature (soldering, 10 seconds)

+30V

Self limiting

±1A

5µJ

–0.3V to +V

CC

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

RT/C

T

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

T/CT

I

SENSE

N/C

N/C N/C

V

CC

V

FB

V

C

ABSOLUTE MAXIMUM RATINGS (T

case

= 25°C unless otherwise stated)

LAB

SEME

IP1842A SERIES
IP1843A SERIES

Semelab plc. Telephone [phone]. Telex: 341927. Fax [phone].

Prelim. 2/95

CURRENT MODE

REGULATING

PULSE WIDTH

MODULATORS

FEATURES

• Guaranteed ±1% reference voltage tolerance

• Accurate oscillator discharge current

• 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 IP and UC1842/3 series for
improved operation

• 500kHz Oscillator operation

Part J–Pack N–Pack D–8 D–14 Temp.
Number 8 Pin 8 Pin 8 Pin 14 Pin Range

IP1842A ✔ -55 to +125°C
IP2842A ✔✔✔✔-25 to +85°C
IP3842A ✔✔✔✔0 to +70°C
IP1843A ✔ -55 to +125°C
IP2843A ✔✔✔✔-25 to +85°C
IP3843A ✔✔✔✔0 to +70°C

Order Information

Note:

To order, add the package identifier to the
part number.

eg. IP1842AD–14

IP3843AJ

* 1844A and 1845A series only.
Values in brackets are for IP1845 series.

3.6V

ERROR

AMP

OSCILLATOR

2R

R

1V

R

S

PWM

LATCH

CURRENT
SENSE
COMPARATOR

16V

(8.4V)

6V

(0.5V) 2.5V

UNDER–VOLTAGE

LOCKOUT

ENABLE

REFERENCE
REGULATOR

5V

INTERNAL

BIAS

34V

REG

R

S

V STATUS

LATCH

REF

PIN NUMBERS
1st Number
2nd Number

– N, J and 8 Pin D Packag es
– 14 Pin D Package.

C

OMP

G

ND

V

CC

I

SENSE

V

FB

/CR

TT

OUTPUT

POWER
GROUND

V

REF

V

C

3/5

5/9

7/12

2/3

1/1

4/7 6/10

7/11

5/8

8/14

TOGGLE

FLIP

FLOP *

T

Q

LAB

SEME

IP1842A SERIES
IP1843A SERIES

Semelab plc. Telephone [phone]. Telex: 341927. Fax [phone].

Prelim. 2/95

V

CC

Supply Voltage

1

I

O

Output Current
Analog Inputs (pins 2 and 3)
Error Amp Output Sink Current

IP1842A , IP1843A

Operating Ambient Temperature Range IP2842A , IP2843A

IP3842A , IP3843A

≤ 30V

0 to ±200mA

–0.3V to 3V

0 to 2mA

–55 to 125°C
–25 to 85°C

0 to 70°C

Notes:

1. Lower limit set by under voltage lockout specification.

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

RECOMMENDED OPERATING CONDITIONS