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SG2540 - OFF-LINE START-UP CONTROLLER

General 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.

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Datasheet Details

Part number SG2540
Manufacturer LINFINITY
File Size 73.52 KB
Description OFF-LINE START-UP CONTROLLER
Datasheet download datasheet SG2540 Datasheet

Full PDF Text Transcription for SG2540 (Reference)

Note: Below is a high-fidelity text extraction (approx. 800 characters) for SG2540. For precise diagrams, and layout, please refer to the original PDF.

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 bu...

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signed 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.

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