Product category:
Power Supply ICs and Controllers
News Release from: Vishay Siliconix | Subject: SiP11205 and SiP11206
Edited by the Electronicstalk Editorial
Team on 28 February 2008
Controllers boast better than 95%
efficiency
Devices simplify designs and reduce costs by eliminating the need for separate controller and high-voltage MOSFET driver components for secondary synchronous rectification.
Two new controller ICs for intermediate bus convertor (IBC) applications are the first such single-chip devices on the market to integrate high-voltage (75V) half-bridge MOSFET drivers with a 1.6A peak current driving capability, as well as a full range of current monitoring and control features The new Vishay Siliconix SiP11205 and SiP11206 controllers are designed to work on the primary side of an isolated half-bridge IBC in telecomms and network equipment and in sixteenth- or eighth-brick power modules where standard bus voltages such as 48V need to be converted to 12V or lower intermediate voltages
This article was originally published on Electronicstalk on 17 Jun 2003 at 8.00am (UK)
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The new devices simplify designs and reduce solution costs by eliminating the need for separate controller and high-voltage MOSFET driver components for secondary synchronous rectification, while their half-bridge architecture further reduces costs and space requirements by enabling the use of lower-voltage components.
The SiP11205 and SiP11206 controllers step down voltages with better than 95% efficiency.
They feature an input voltage range of 36 to 75V and comfortably handle 100V transients for 100ms in compliance with ETSI300-132-2.
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Integrated +/-1.6A high-voltage MOSFET drivers allow each IC to drive both the low- and high-side switching devices in a half-bridge convertor.
The oscillator frequency is programmable from 200kHz to 1MHz, the widest such range in the industry, and can be synchronised to an external sync source.
Self-driven synchronous rectification eliminates the requirement for secondary-side MOSFET drivers and isolated pulse drivers, reducing costs and simplifying designs.
The SiP11205 features input-voltage sensing and feed-forward circuitry that keeps the output voltage within a tight range without the use of optocouplers or voltage feedback circuitry.
The SiP11206 differs by allowing the convertor to work at the optimal duty cycle within its full input voltage range in DC transformer mode, which greatly improves system efficiency.
For designs requiring a fully regulated IBC, Vishay offers the Si9122A half-bridge controller with the SiP11203 or SiP11204 secondary synchronous rectifier driver.
The SiP11205 and SiP11206 offer a comprehensive range of protection features.
The controller supply voltage is linearly regulated up to its target voltage with an on-chip pre-regulator circuit.
Advanced current monitoring and control circuitry allows the user to set the maximum current in the primary circuit.
This feature protects against overcurrent conditions, output short circuits, and errors when paralleling power supplies.
Additional features include low input-voltage detection, programmable soft-start, and overtemperature protection.
A reference design for a full implementation of an IBC module capable of handling 15A at a 12V output and operating with greater than 95% efficiency is available for download.
Packaged in the MLP44-16 PowerPAK or TSSOP-16 PowerPAK, samples and production quantities of the SiP11205 and SiP11206 are available now, with lead times of 10 to 12 weeks for larger orders.
Pricing for US delivery in 1000-piece quantities is US $2.25 for the SiP11205 and $1.95 for the SiP11206.
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