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THE INFINITE POWER OF INNOVATION
SG1825C / SG2825C / SG3825C
HIGH-SPEED CURRENT-MODE PWM
PRODUCTION DATA SHEET
DESCRIPTION
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, highfrequency 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 voltagemode 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 HIGHLIGHT
INITIAL OSCILLATOR ACCURACY
15
Sample Size = 279 Mean 401.661 Std. Dev. = 3.8
10
KEY FEATURES
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
Percentage of Units - %
KEY FEATURES
5 AVAILABLE TO MIL-STD-883B MICROSEMI LEVEL "S"
PROCESSING AVAIL.
0 390 395 400 405 410 415
Initial Oscillator Accuracy - KHz
PACKAGE ORDER INFO
TJ (°C)
N Plastic DIP 16-Pin
DW Plastic SOIC 16-Pin
Q Plastic LCC 20-Pin
RoHS Compliant / Pb-free RoHS Compliant / Pb-free
Transition DC: 0503
Transition DC: 0516
0 to 70 -25 to 85 -55 to 125 MIL-STD-883
DESC
SG3825CN SG2825CN
-
SG3825CDW SG2825CDW
-
SG32825CQ SG2825CQ
-
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. SG3825CN-TR)
J LCeramic DIP 16-Pin
Ceramic LCC 20-Pin
SG3825CJ SG282CJ SG1825CJ SG1825CJ/883B SG1825CJ/DESC
SG1825CL SG1825CL/883 SG1825CL/DESC
Copyright © 1994 Rev. 1.3a,2005-03-21
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
PRODUCT DATABOOK 1996/1997
SG1825C/SG2825C/SG3825C
HIGH-SPEED CURRENT-MODE PWM NOT RECOMMENDED FOR NEW DESIGNS
A B S O L U T E M A X I M U M R AT I N G S (Note 1)
RoHS Peak Package Solder Reflow Temp. (40 sec. max. exp.)......................................................... 260° (+0, -5)
Input Voltage .