Product category:
Power Supply ICs and Controllers
News Release from: International Rectifier | Subject: IR3623
Edited by the Electronicstalk Editorial
Team on 28 April 2006
PWM controller cuts convertor complexity
A high performance dual synchronous buck PWM control IC helps reduce component count and footprint in nonisolated DC/DC buck convertors delivering up to 80A.
International Rectifier has introduced the IR3623, a high performance dual synchronous buck PWM control IC Designed to be used with iP2003A iPowir integrated driver-MOSFET power building blocks, the chipset reduces component count and footprint in nonisolated DC/DC buck convertors delivering up to 80A in embedded networking and communications systems, point-of-load (POL) regulator modules and high-density blade servers
This article was originally published on Electronicstalk on 15 Feb 2001 at 8.00am (UK)
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The chipset can be configured to operate either as a high current (80A), single output convertor, or as two independent 40A convertors, switching 180 degrees out of phase.
For example, in a 12V input, 1.75V output application with 500kHz switching frequency and a dual-channel configuration, the IR3623/iP2003A chipset achieves greater than 90% efficiency at 25A per channel without a heatsink.
compared with a similar convertor made with a discrete power stage, the chipset requires 32% less board area as component count shrinks from eleven active devices to only three.
The new PWM control IC offers a full array of protection features.
For startup, the IR3623 features a dedicated enable pin, an input under-oltage lockout circuit, and the ability to start up into a prebiased output voltage.
In addition, the device features hiccup mode overcurrent protection, output overvoltage protection and thermal shutdown.
For true dual-channel operation, the chipset offers two independent programmable soft starts, and two independent power-good outputs.
The IR3623 offers full support for output voltage tracking and power sequencing for multiple-rail applications.
Flexibility is included to allow for sequential, ratio metric or simultaneous voltage tracking of both channels without the need for any external components.
The iP2003A power stage block integrates a synchronous gate driver, high- and low-side power MOSFETs, a synchronous Schottky diode and passive components required for each convertor phase, simplifying design and layout.
The devices are lead-free and are compliant with the Restriction of Hazardous Substances Directive (RoHS).
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