Product category:
Power Supply ICs and Controllers
News Release from: Allegro MicroSystems Europe | Subject: STR-X6400 Series
Edited by the Electronicstalk Editorial
Team on 22 June 2001
Power supply chip changes mode to raise
efficiency
The STR-X6400 Series from Allegro MicroSystems Europe is a multimode offline switch-mode power-supply IC that automatically changes its operating mode to ensure maximum efficiency.
The STR-X6400 Series from Allegro MicroSystems Europe is a multimode offline switch-mode power-supply IC that 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 Electronicstalk on 30 Aug 2000 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 120W output.
The design of the new circuit means that additional standby power is not necessary, 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 multichip 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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