SG1842_1 Datasheet, PDF (1/14 Pages) Microsemi Corporation – CURRENT MODE PWM CONTROLLER

SG1842/SG1843 Series
TM
®
CURRENT MODE PWM CONTROLLER
PRODUCTION DATA SHEET
DESCRIPTION
The SG1842/43 family of control IC's provides all lockout, current limiting circuitry and start-up
the necessary features to implement off-line fixed current of less than 1mA. The totem-pole output
frequency, current-mode switching power supplies is optimized to drive the gate of a power
with a minimum number of external components. MOSFET. The output is low in the off state to
Current-mode architecture demonstrates improved provide direct interface to an N channel device.
line regulation, improved load regulation, pulse- The SG1842/43 is specified for operation over
by-pulse current limiting and inherent protection the full military ambient temperature range of -
of the power supply output switch. The bandgap 55°C to 125°C. The SG2842/43 is specified for
reference is trimmed to ±1% over temperature. the industrial range of -25°C to 85°C, and the
Oscillator discharge current is trimmed to less SG3842/43 is designed for the commercial range
than ±10%. The SG1842/43 has under-voltage of 0°C to 70°C.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
PRODUCT HIGHLIGHT
R_ST
AC
INPUT
I_ST
V_CC
SG3842
KEY 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
HIGH RELIABILITY
FEATURES
„ AVAILABLE TO MIL-STD-883B AND
DSCC
„ SCHEDULED FOR MIL-M38510
QPL LISTING
„ RADIATION DATA AVAILABLE
„ Microsemi LEVEL "S" PROCESSING
AVAILABLE
Plastic DIP
Plastic DIP
T_A (°C) ^M 8-Pin
N _14-Pin
RoHS / Pb-free Transition DC: 0503
0 to 70
SG3842M
SG3843M
SG3842N
SG3843N
-25 to 85
SG2842M
SG2843M
SG2842N
SG2843N
-55 to
125
MIL-
STD/883
DESC
PACKAGE ORDER INFO
Plastic SOIC
Plastic SOIC
Ceramic Dip
DM _8-Pin
D _14-Pin
Y _8-Pin
RoHS / Pb-free Transition DC:0440
SG3842DM
SG3842D
SG3843DM
SG3843D
SG3842Y
SG3843Y
SG2842DM
SG2843DM
SG2842D
SG2843D
SG2842Y
SG2843Y
SG1842Y
SG1843Y
SG1842Y/883B
SG1843Y/883B
SG1842Y/DESC
SG1843Y/DESC
Ceramic DIP
J _14-Pin
SG3842J
SG3842J
SG2842J
SG2843J
SG1842J
SG1843J
SG1842J/883B
SG1843J/883B
SG1842J/DESC
SG1843J/DESC
Cer Flatpack
Ceramic LCC
F _10-Pin
L _20-Pin
SG1842F
SG1843F
SG1842F/883B
SG1843F/883B
SG1842F/DESC
SG1843F/DESC
SG1842L
SG1842L
SG1842L/883B
SG1843L/883B
SG1842L/DESC
SG1843L/DESC
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. SG2843DM-TR)
Plastic packages are RoHS compliant
Copyright © 2000
Rev. 1.6b 2010-03-15
Microsemi
Analog Mixed Signal Group
1
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]