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SG1540

LINFINITY
Part Number SG1540
Manufacturer LINFINITY
Description OFF-LINE START-UP CONTROLLER
Published Oct 29, 2017
Detailed Description SG1540/SG2540/SG3540 OFF-LINE START-UP CONTROLLER DESCRIPTION The SG1540 is an integrated circuit designed to efficien...
Datasheet PDF File SG1540 PDF File

SG1540
SG1540

Overview
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...


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