MANHASSET, NY -- iWatt, Inc., has expanded its family of dc/dc LED
backlight drivers with its iW7032 which can power up to 32 parallel
strings of LEDs.
The mixed-signal IC features iWatt’s digital adaptive switching
technology with integrated MOSFETs. Adaptive switching reduces thermal
overhead and power consumption, while the integrated MOSFETs reduce
component count, form factors and costs for dynamic backlighting. iWatta
targets the chip for mainstream direct or segment-edge-dimmed TVs.
With high voltage support (up to 56V) and adaptive switching to overcome
thermal problems, the iW7032 is capable of driving up to 32 parallel
strings, numbering 15 LEDs per string, to power 480 total LEDs from one
iWatt’s proprietary digital adaptive switching technology senses the
mismatch of the varying forward voltages (Vf) of the multiple strings of
LEDs and adjusts appropriately for each string. This reduces the wasted
power by up to 90 percent. iWatt projects it saves 2-5W per IC.
The iW7032 features an integrated MOSFET for each string of LEDs which
can reduce driver printed-circuit-board form factors by up to 50 percent
compared to solutions relying on external MOSFETS, according to the
iWatt projects LED TV manufacturers can save $1 to $3 in
bill-of-material (BOM) costs for each iW7032 used. A typical 46-in.
direct-lit LED TV might use two to four iW7032 drivers, saving the
manufacturer up to $12.
"By overcoming the thermal problems of driving large numbers of LEDs
together, our engineers have made a large contribution towards cutting
costs for the dynamic backlighting industry," said Gyan Tiwary, senior vice president and general manager of the DC/DC group at iWatt.
The iW7032 comes in 64-pin QFP package with an exposed pad for optimum
reliability. Samples are available at $3.80 in 1000-piece quantities.
One of the first sets to incorporate iWatt’s new driver is a new Chinese
name brand 52-in 3-D LED TV with local dimming, according to iWatt.
Privately-held iWatt, Inc. is a power control IC company that designs,
develops, and markets semiconductor products for the communication and
consumer market segments. It is backed by VantagePoint Capital Partners
and Sigma Partners, two leading CleanTech investors, and Horizon