SG2843D Microsemi Corporation, SG2843D Datasheet

SG2843D

Manufacturer Part Number

SG2843D

Description

Current Mode PWMs

Manufacturer

Microsemi Corporation

Datasheet

1.SG2843D.pdf (14 pages)

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Rev. 1.6

H E

MIL-STD/883

-55 to 125

-25 to 85

0 to 70

The SG1842/43 family of control IC's

provides all the necessary features to

implement off-line fixed frequency,

current-mode switching power supplies

with a minimum number of external

components. Current-mode

architecture demonstrates improved

line regulation, improved load

regulation, pulse-by-pulse current

limiting and inherent protection of the

power supply output switch.

±1% over temperature. Oscillator

discharge current is trimmed to less

than ±10%. The SG1842/43 has under-

DESC

The bandgap reference is trimmed to

4/00

(°C)

N F I N I T E

Y P I C A L

SG3842M

SG3843M

SG2842M

SG2843M

Plastic DIP

8-pin

INPUT

—

P P L I C AT I O N O F

O W E R

P R O D U C T H I G H L I G H T

SG3842N

SG3843N

SG2842N

SG2843N

Plastic DIP

14-pin

F O R F U R T H E R I N F O R M A T I O N C A L L ( 7 1 4 ) 8 9 8 - 8 1 2 1

—

D E S C R I P T I O N

O F

S G 3 8 4 2 I

11861 W

Note: All surface-mount packages are available in Tape & Reel.

P A C K A G E O R D E R I N F O R M A T I O N

N N O V A T I O N

SG3842DM

SG3843DM

SG2842DM

SG2843DM

Plastic SOIC

8-pin

voltage lockout, current limiting

circuitry and start-up current of less

than 1mA.

to drive the gate of a power MOSFET.

The output is low in the off state to

provide direct interface to an N

channel device.

operation over the full military ambient

temperature range of -55°C to 125°C.

The SG2842/43 is specified for the

industrial range of -25°C to 85°C, and

the SG3842/43 is designed for the

commercial range of 0°C to 70°C.

—

ESTERN

The totem-pole output is optimized

The SG1842/43 is specified for

SG3842

A F

VENUE

LY B A C K

SG3842D

SG3843D

SG2842D

SG2843D

Plastic SOIC

14-pin

, G

—

ARDEN

O N V E R T E R

SG1842Y/883B SG1842J/883B

SG1843Y/883B SG1843J/883B

SG1842Y/DESC SG1842J/DESC

SG1843Y/DESC SG1843J/DESC

SG3842Y

SG3843Y

SG2842Y

SG2843Y

SG1842Y

SG1843Y

U R R E N T

Ceramic DIP

8-pin

ROVE

R O D U C T I O N

SG1842/SG1843 Series

, CA. 92841

SG3842J

SG3843J

SG2842J

SG2843J

SG1842J

SG1843J

O D E

Ceramic DIP

14-pin

HIGH RELIABILITY FEATURES

OPTIMIZED FOR OFF-LINE CONTROL

LOW START-UP CURRENT (<1mA)

AUTOMATIC FEED FORWARD

COMPENSATION

TRIMMED OSCILLATOR DISCHARGE

CURRENT

PULSE-BY-PULSE CURRENT LIMITING

ENHANCED LOAD RESPONSE

CHARACTERISTICS

UNDER-VOLTAGE LOCKOUT WITH 6V

HYSTERESIS (SG1842 only)

DOUBLE-PULSE SUPPRESSION

HIGH-CURRENT TOTEM-POLE OUTPUT

(1AMP PEAK)

INTERNALLY TRIMMED BANDGAP

REFERENCE

500KHZ OPERATION

UNDERVOLTAGE LOCKOUT

SG1842 - 16 volts

SG1843 - 8.4 volts

LOW SHOOT-THROUGH CURRENT <75mA

OVER TEMPERATURE

AVAILABLE TO MIL-STD-883B AND DESC

SMD

SCHEDULED FOR MIL-M38510 QPL LISTING

RADIATION DATA AVAILABLE

LINFINITY LEVEL "S" PROCESSING AVAILABLE

P W M C

K E Y F E A T U R E S

SG1842F/DESC SG1842L/DESC

SG1843F/DESC SG1843L/DESC

A T A

Cer. Flatpack

10-pin

—

O N T R O L L E R

L I N D

H E E T

SG1842L/883B

SG1843L/883B

O C

SG1842L

SG1843L

Ceramic LCC

20-pin

# : 1842

—

Related parts for SG2843D

SG2843D Summary of contents

Page 1

... Plastic SOIC Plastic SOIC Ceramic DIP 8-pin 14-pin 8-pin SG3842DM SG3842D SG3842Y SG3843DM SG3843D SG3843Y SG2842DM SG2842D SG2842Y SG2843DM SG2843D SG2843Y — — SG1842Y — — SG1843Y — — SG1842Y/883B SG1842J/883B — — SG1843Y/883B SG1843J/883B — — SG1842Y/DESC SG1842J/DESC — — ...

Page 2

SG1842/SG1843 Series ...

Page 3

...

Page 4

SG1842/SG1843 Series ...

Page 5

34V GROUND** 16V (1842) 8.4V (1843) OSCILLATOR ERROR AMP ...

Page 6

SG1842/SG1843 Series GRAPH / CURVE INDEX Characteristic Curves FIGURE # 1. DROPOUT VOLTAGE vs. TEMPERATURE 2. ...

Page 7

FIGURE 1. — DROPOUT VOLTAGE vs. TEMPERATURE 10.0 SG1842 9.6 9.2 8.8 8.4 8.0 SG1843 -75 ...

Page 8

SG1842/SG1843 Series FIGURE 5. — START-UP CURRENT vs. TEMPERATURE 0.7 SG1842 0.6 0.5 0.4 0.3 SG1843 ...

Page 9

FIGURE 9. — OSCILLATOR DISCHARGE CURRENT vs. TEMPERATURE 8.2 8.0 7.8 7.6 7.4 7.2 -75 -50 ...

Page 10

SG1842/SG1843 Series OSCILLATOR The oscillator of the 1842/43 family of PWM's is designed such that many ...

Page 11

Pin numbers referenced are for 8-pin package and pin numbers in parenthesis are for 14-pin package. ...

Page 12

SG1842/SG1843 Series ...

Page 13

...

Page 14

SG1842/SG1843 Series ...

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