Product category:
Power Supplies and Uninterruptible Power Supplies
News Release from: Allegro MicroSystems Europe | Subject: STR-X6400 Series power-supply
Edited by the Engineeringtalk Editorial
Team on 22 June 2001
Multi-mode offline switch-mode
power-supply IC
The STR-X6400 Series from Allegro MicroSystems Europe is a multi-mode offline switch-mode power-supply integrated circuit which automatically changes its operating mode to ensure maximum efficiency
The STR-X6400 Series from Allegro MicroSystems Europe is a multi-mode offline switch-mode power-supply integrated circuit which automatically changes its operating mode to ensure maximum efficiency over different output loads The new circuit can operate in any one of four modes: quasi-resonant; quasi-resonant plus bottom cycle skip, PRC (pulse ratio control with fixed off-time); and burst mode
This article was originally published on Engineeringtalk on 19 Feb 2001 at 8.00am (UK)
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It detects the output load and selects the appropriate mode automatically, achieving an efficiency of up to 90% with 120 W output.
The design of the new circuit means that additional standby power is unnecessary, with the standby input power being one-third less than on existing SMPS power ICs.
A hysteresis function is included to stabilise the bottom cycle operation, and a step-drive function is used to control the turn-on surge current of the MOSFET.
The device incorporates overcurrent, thermal, overvoltage and overload protection.
It is based on a multi-chip structure with a 7-pin isolated inner frame, which allows the MOSFET to be changed to achieve higher output power ratings.
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