OF

1

Copyright

© 1994

Rev. 1.3a,2005-03-21

SG1825C / SG2825C / SG3825C

DESCRI PTI O N

The SG1825C is a high-performance pulse

width modulator optimized for high frequency

current-mode power supplies. Included in the

controller are a precision voltage reference,

micro power start-up circuitry, soft start, high-

frequency oscillator, wideband error amplifier,

fast current limit comparator, full double-pulse

suppression logic, and dual totem pole output

drivers. Innovative circuit design and an

advanced linear Schottky process result in

very short propagation delays through the

current limit comparator, logic, and output

drivers. This device can be used to

implement either current mode or voltage-

mode switching power supplies. It also is

useful as a series-resonant controller to

frequencies beyond 1MHz. The SG1825C is

specified for operation over the full military

ambient temperature range of -55°C to

125°C.

The SG2825C is characterized for the

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

SG3825C is selected for the commercial

range of 0°C to 70°C.

IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com

PRODUCT H I GHLIGHT

0

5

15

10

390

395

400

405

410

Initial Oscillator Accuracy - KHz

415

Sample Size = 279

Mean 401.661

Std. Dev. = 3.8

KEY FEATUR ES

IMPROVED REFERENCE

INITIAL TOLERANCE (±1%

max.)

IMPROVED OSCILLATOR

INITIAL ACCURACY (±3% typ.)

IMPROVED STARTUP

CURRENT (500µA typ.)

PROP DELAY TO OUTPUTS

(50ns typ.)

10V TO 30V OPERATION

5.1V REFERENCE TRIMMED

TO ±1%

2MHZ OSCILLATOR

CAPABILITY

1.5A PEAK TOTEM-POLE

DRIVERS

U.V. LOCKOUT WITH

HYSTERESIS

NO OUTPUT DRIVER "FLOAT"

PROGRAMMABLE

SOFTSTART

DOUBLE-PULSE

SUPPRESSION LOGIC

WIDEBAND LOW-IMPEDANCE

ERROR AMPLIFIER

CURRENT-MODE OR

VOLTAGE-MODE CONTROL

WIDE CHOICE OF HIGH-

FREQUENCY PACKAGES

KEY FEATUR ES

AVAILABLE TO MIL-STD-883B

MICROSEMI LEVEL "S"

PROCESSING AVAIL.

PACKAGE ORDER INFO

N

Plastic DIP

16-Pin

DW

Plastic SOIC

16-Pin

Q

Plastic LCC

20-Pin

J

Ceramic DIP

16-Pin

L

Ceramic LCC

20-Pin

°C)

RoHS Compliant / Pb-free

Transition DC: 0503

RoHS Compliant / Pb-free

Transition DC: 0516

0 to 70

SG3825CN

SG3825CDW

SG32825CQ

SG3825CJ

-

-25 to 85

SG2825CN

SG2825CDW

SG2825CQ

SG282CJ

-

-55 to 125

-

-

-

SG1825CJ

SG1825CL

MIL-STD-883

-

-

-

SG1825CJ/883B

SG1825CL/883

DESC

-

-

-

SG1825CJ/DESC SG1825CL/DESC

Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. SG3825CN-TR)