Product category:
Power Supply ICs and Controllers
News Release from: Allegro MicroSystems Europe | Subject: STR-G6551
Edited by the Electronicstalk Editorial
Team on 30 November 2001
Fixed-off-time flyback switching
regulator IC
The STR-G6551 from Allegro MicroSystems is a fixed-off-time switching regulator integrated circuit capable of handling up to 60W.
The STR-G6551 from Allegro MicroSystems is a fixed-off-time switching regulator integrated circuit capable of handling up to 60W The new TO-220 packaged device uses a hybrid construction incorporating an avalanche rated power mosfet and a fixed-frequency mixed-mode control IC
This article was originally published on Electronicstalk on 30 Aug 2000 at 8.00am (UK)
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The power mosfet is rated at 700V, and is soft switched for low-noise operation.
The control IC operates at 100kHz, and has a built-in oscillator, undervoltage lockout, pulse-by-pulse current-limiting, programmable overcurrent protection, latched overvoltage protection, timer latched overload protection, and latched thermal shutdown.
A digitally controlled built-in soft-start facility limits the switch current at start-up without the need for additional external components.
The fixed 16us off-time at start-up limits dissipation in the power switch.
Maximum frequency of operation is 63kHz.
Noise filtering is by means of a switched-attenuation filter technique that also enhances stability at light load.
The device offers a robust, economical, low-risk solution for offline switch-mode power supplies, particularly where management of electromagnetic interference at the source is a significant element of the system design.
The 5-pin overmoulded TO-220 style package provides dielectric isolation without compromising thermal characteristics.
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