Product category: Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX8540/1
Edited by the Electronicstalk Editorial Team on 15 May 2003
Controllers cut isolated convertor size
and cost
The MAX8540 is a current-mode PWM controller and the MAX8541 a voltage-mode PWM controller for isolated forward and flyback DC/DC convertor modules.
The MAX8540 is a current-mode PWM controller and the MAX8541 a voltage-mode PWM controller for isolated forward and flyback DC/DC convertor modules These controllers permit common PCB design for voltage-mode and current-mode convertors to reduce engineering, inventory and manufacturing costs
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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The MAX8540/MAX8541 operate at 200kHz to 1MHz switching frequencies and synchronise to an external clock.
These controllers permit optimisation of magnetics design, providing an important performance advantage over competing products.
An adjustable maximum duty cycle with voltage feed-forward reduces transformer size by maintaining a constant maximum primary volt-seconds over the input-voltage range.
Adjustable slope compensation (MAX8540) and adjustable voltage ramp (MAX8541) allow further optimisation of magnetics design.
Both controllers feature cycle-by-cycle, current-limit protection.
The user can program the number of current-limited cycles needed to initiate the hiccup mode while at the same time ensuring startup into high-capacitance loads, which is a critical design challenge.
The number of skipped cycles in hiccup mode can also be programmed to limit the power dissipation during a fault condition.
Alternatively, the MAX8540/MAX8541 can also be programmed to latch off the controllers during fault conditions following a programmable delay or operate continuously in cycle-by-cycle current-limit mode.
The MAX8540/MAX8541 feature active-high and active-low enable controls and programmable undervoltage and overvoltage protection.
They use an integrated 9ohm gate driver for low-power designs or an external gate driver for high-power designs.
The MAX8540EEE/MAX8541EEE are available in space-saving 16-pin QSOP packages and are specified for the extended-industrial temperature range (-40 to +85C).
Prices start at $1.75 (1000-up, FOB, USA).
An evaluation kit is available to speed designs.
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