Product category:
Power Supply ICs and Controllers
News Release from: International Rectifier | Subject: IR3092
Edited by the Electronicstalk Editorial
Team on 13 October 2004
PWM controller powers up latest
processor families
The IR3092 is an 80A programmable two-phase interleaved PWM control IC that supports AMD Athlon, AMD Athlon64, AMD Opteron and Intel VR10.X processors.
The IR3092 is an 80A programmable two-phase interleaved PWM control IC that supports AMD Athlon, AMD Athlon64, AMD Opteron and Intel VR10.X processors Applications include server and desktop computer motherboards, voltage regulator modules (VRM), video graphics cards and telecomms single inline package (SIP) modules
This article was originally published on Electronicstalk on 15 Feb 2001 at 8.00am (UK)
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The IR3092 is ideal for space-constrained systems with high load current and efficiency requirements.
Compared with competing devices that require external gate drive circuits, the IR3092 includes integrated MOSFET drivers with 3.5A drive capability.
Existing two-phase solutions that are implemented with three ICs can now be replaced with a single IR3092 improving system reliability, reducing board area and simplifying circuit design.
A patent-pending body braking circuit reduces the output capacitance requirement by up to 25% further reducing system costs.
When combined with IR's DirectFET technology HEXFET MOSFETs, circuit designers can realise a highly efficient, space saving solution with the IR3092.
The PWM control IC operates from a single 12V supply and includes a linear regulator to power the gate drivers.
The regulator output voltage can be programmed to minimise switching losses and optimise efficiency.
A programmable oscillator, with a frequency range of 100 to 540kHz, gives the designer additional flexibility to improve system efficiency and transient response.
For system protection and reliability, the IR3092 features programmable soft-start and hiccup overcurrent protection.
Current sensing is achieved with lossless inductor current sensing which gives improved accuracy compared with sensing circuits measuring MOSFET on-resistance.
Dual undervoltage lockout circuits and overvoltage protection ensure reliability of system voltages.
A power-good output signal indicates proper operation.
To meet the stringent power requirements of today's microprocessors, the output voltage can be programmed with either a 5 or 6bit voltage identification (VID) code with 0.5% set-point accuracy.
An adaptive voltage-positioning feature maintains the output voltage tolerance while minimising output capacitor requirements.
The IC is also capable of 100% duty cycle operation to further improve transient response.
In addition, the IR3092 features programmable slew rate response to "on-the-fly" VID code changes.
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