Product category:
Power Supply ICs and Controllers
News Release from: International Rectifier | Subject: IR2161
Edited by the Electronicstalk Editorial
Team on 31 May 2004
Intelligent approach to driving halogen
lamps
The IR2161 is heralded as the world's first intelligent control IC specifically designed for electronic transformers that drive low voltage halogen lamps.
The IR2161 is heralded as the world's first intelligent control IC specifically designed for electronic transformers that drive low voltage halogen lamps All necessary features are integrated into a single 8-pin DIP or SOIC, reducing parts count, simplifying circuits and increasing reliability
This article was originally published on Electronicstalk on 30 Sep 2004 at 8.00am (UK)
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The new IR2161 control IC can adapt to changing supply voltage, frequency conditions, and lamp conditions enabling the introduction of highly reliable halogen transformers while streamlining their design and manufacture.
Featuring IR's rugged high voltage IC technology, this compact 8-pin device incorporates a 600V half-bridge driver, advanced overload and short-circuit protection circuitry with high temperature shutdown and adaptive control techniques offering a reliable alternative to the traditional approach based upon self-resonating, bipolar transistor half-bridge circuits.
The IR2161 also accommodates external dimming with a standard phase-cut, triac-based dimmer.
Further reading
MOSFETs improve 12V-input converter efficiency
Two new 20V HEXFET power MOSFET families from International Rectifier are designed to increase efficiency by up to 4% in 12V-input DC/DC convertors.
MOSFETs improve power density on both sides
New from International Rectifier are two TO-220-packaged HEXFET power MOSFETs that maximise power density and performance in primary- and secondary-side DC/DC convertor circuits.
Rad-hard MOSFETs protect and survive
With high radiation hardness and unparalleled single event effect (SEE) immunity, International Rectifier's new R5 MOSFETs are well suited for systems that must survive penetrating gamma rays.
Compared with similar circuits using discrete components, the IR2161 can reduce component count by 20%.
Adaptive dead-time control is a key feature of the IR2161, which increases transformer reliability by continually maintaining soft switching.
The IC has an active dead-time circuit that detects the point at which the DC bus voltage in the half bridge slews to 0V and sets the low-side driver (LO output) high.
An internal sample and hold system allows approximately the same delay to be used to set the high-side driver (HO output) high after LO has gone low.
Adaptive dead-time control reacts on a cycle-by-cycle basis of the oscillator and adjusts dead time as necessary to maintain soft switching regardless of external conditions.
The IR2161 is based upon International Rectifier's high-voltage junction-isolation (HVJI) IC technology.
This proprietary technology allows high-voltage circuits to be isolated from low-voltage circuitry, so that both high- and low-side drive functions can be housed on a single, compact chip for controlling various switching convertor topologies.
As halogen lighting requires both high- and low-voltage circuits to function, components made with IR's HVJI technology are particularly well suited to the application.
"We're applying an array of technologies and techniques to respond to some of the toughest challenges confronting engineers in our markets".
"The combination of IR's adaptive control techniques with leading edge HVJI silicon delivers a simple and superior solution to lighting manufacturers", said David Tam, International Rectifier Vice President, Consumer and Industrial Sector Business.
Key specifications for the IR2161 include output drive capability of 250/400mA, 15.6V Zener diode clamp on Vcc, micropower startup of less than 300uA and a built-in 30 to 125kHz oscillator.
Datasheets are posted on the International Rectifier website.
In addition, an entire suite of application notes, technical papers, design software and reference designs are available.
The IR2161 convertor IC is available immediately in 8-pin DIP, 8-pin SOIC, and 8-pin SOIC tape and reel.
Pricing for the IR2161 begins at US $0.73 each (IR2163S) in 100,000-piece quantities.
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