Applying Fairchild Power Switch FSL1x7 to Low-Power Supplies Application Note

This application note describes the application of Fairchild Power Switch (FPS™) FSL1x7 in low-power supplies. It includes external components minimization, green mode, peak-current-mode control, open-loop/overload protection, over-voltage protection and over-temperature protection.

Brand: Fairchild
Document type: Application Note
Language: English
Pages: 12
File format: PDF
File size: 620 KB
Published: 12 July, 2012
Updated: 30 September, 2023
Model: FSL1X7
MD5 checksum: C8B05437271A8E82FE54536128B0B7D9
PDF: Applying Fairchild Power Switch FSL1x7 to Low-Power Supplies Application Note PDF

About this manual

The document introduces the Fairchild Power Switch (FPS) FSL-series, which integrates a current-mode Pulse Width Modulator and an avalanche-rugged 7000V SenseFET. Key features include proprietary green-mode function for off-time modulation to minimize standby power consumption, built-in synchronized slope compensation, and integrated protection functions such as open-loop/overload (OLP), over-voltage (OVP), and over-temperature (OTP) protection.

What's inside

Introduction
Device Block Description
Startup Circuit
Soft-Start
Green Mode Operation
Constant Power Control
Protection Functions
Design Example

Frequently asked questions

What is the typical startup current of the FSL-series?

The typical startup current is 3.5mA.

At what voltage does the Vpp over-voltage protection trigger?

The OVP is triggered when Vpp reaches 28V.

What happens when the junction temperature exceeds approximately 142°C?

Thermal shutdown is activated to protect the device.

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