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SG2540

Description
0.1 A SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDIP8
CategoryPower/power management   
File Size80KB,6 Pages
ManufacturerMicrosemi
Websitehttps://www.microsemi.com
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SG2540 Overview

0.1 A SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDIP8

SG1540/SG2540/SG3540
OFF-LINE START-UP CONTROLLER
DESCRIPTION
The SG1540 is an integrated circuit designed to efficiently provide
start-up power from a high-voltage DC bus to a PWM control circuit
in a switching power supply. When used on the primary side, it
reduces start-up current to less than 1mA and allows any standard
PWM control circuit to be used as a primary-side controller. When
used to power a controller on the secondary side, it efficiently
eliminates the need for a heavy 50/60Hz line transformer with its
associated low frequency magnetic fields.
The circuit consists of three sections: a micropower bandgap
comparator/power switch referenced to 2.5 volts which isolates the
start-up capacitor from its load; a high frequency square-wave
oscillator with 200mA totem-pole output for driving an isolation
transformer; and a second bandgap comparator with latching
crowbar to protect against overvoltage faults while starting or
running.
The SG1540 is specified for operation over the full military ambient
temperature range of -55°C to 125°C. The SG2540 is character-
ized for the industrial range of -25°C to 85°C, and the SG3540 is
designed for the commercial range of 0°C to 70°C.
FEATURES
Useable with primary and secondary side PWM
controllers
Micropower comparator / switch
- Internal 2.5V bandgap reference
- 50mA power switch
Squarewave oscillator
- 500Hz to 200KHz operation
- 200mA totem pole outputs
Eliminates bulky, expensive 50/60 Hz transformer
Minimizes high voltage bleeder current
Programmable start-up voltage and hysteresis
Internal and programmable overvoltage crowbar
latch
Available in 8 pin DIP, 10 pin flat pack, and 16 pin
widebody SOIC
HIGH RELIABILITY FEATURES - SG1540
Available to MIL-STD - 883
LMI level "S" processing available
BLOCK DIAGRAM
4/90 Rev 1.1 2/94
Copyright
©
1994
1
11861 Western Avenue
Garden Grove, CA 92841
(714) 898-8121
FAX: (714) 893-2570
L
INFINITY
Microelectronics Inc.

SG2540 Related Products

SG2540 SG2540Y SG2540M SG2540DW SG1540Y/883B SG1540Y SG1540
Description 0.1 A SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDIP8 0.1 A SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, CDIP8 0.1 A SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDIP8 0.1 A SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDSO16 0.1 A SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, CDIP8 0.1 A SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDIP8 0.1 A SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDIP8
Parts packaging code - - DIP SOIC DIP DIP -
package instruction - - DIP, SOP, DIP, DIP, -
Contacts - - 8 16 8 8 -
Reach Compliance Code - - compli compli unknow compli -
ECCN code - - EAR99 EAR99 EAR99 EAR99 -
Analog Integrated Circuits - Other Types - - SWITCHING CONTROLLER SWITCHING CONTROLLER SWITCHING CONTROLLER SWITCHING CONTROLLER -
control mode - - VOLTAGE-MODE VOLTAGE-MODE VOLTAGE-MODE VOLTAGE-MODE -
Control Technology - - PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION -
Maximum input voltage - - 35 V 35 V 35 V 35 V -
Minimum input voltage - - 7 V 7 V 7 V 7 V -
Nominal input voltage - - 15 V 15 V 15 V 15 V -
JESD-30 code - - R-PDIP-T8 R-PDSO-G16 R-CDIP-T8 R-CDIP-T8 -
Number of functions - - 1 1 1 1 -
Number of terminals - - 8 16 8 8 -
Maximum operating temperature - - 85 °C 85 °C 125 °C 125 °C -
Minimum operating temperature - - -25 °C -25 °C -55 °C -55 °C -
Maximum output current - - 0.2 A 0.2 A 0.2 A 0.2 A -
Package body material - - PLASTIC/EPOXY PLASTIC/EPOXY CERAMIC, METAL-SEALED COFIRED CERAMIC, METAL-SEALED COFIRED -
encapsulated code - - DIP SOP DIP DIP -
Package shape - - RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR -
Package form - - IN-LINE SMALL OUTLINE IN-LINE IN-LINE -
Certification status - - Not Qualified Not Qualified Not Qualified Not Qualified -
Maximum seat height - - 5.308 mm 1.75 mm 5.08 mm 5.08 mm -
surface mount - - NO YES NO NO -
Switch configuration - - SINGLE SINGLE SINGLE SINGLE -
Maximum switching frequency - - 400 kHz 400 kHz 400 kHz 400 kHz -
Temperature level - - OTHER OTHER MILITARY MILITARY -
Terminal form - - THROUGH-HOLE GULL WING THROUGH-HOLE THROUGH-HOLE -
Terminal pitch - - 2.54 mm 1.27 mm 2.54 mm 2.54 mm -
Terminal location - - DUAL DUAL DUAL DUAL -
width - - 7.62 mm 3.9 mm 7.62 mm 7.62 mm -
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