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ADDtek Corp. Launched new LED Monitor / TV backlight driver IC
products - a highly integrated low-cost A732, as well as support for
high-power master-slave architecture A728.
A732 built-in boost converter with 60V switch and 8-channel constant
current sinks with 50V MOSFET, it could driving up to 10.8W of the
LED, suitable for use in 17 ", 19" LED Monitor backlight. A728
combined boost converter control circuit which driving external
power switch and built-in 12-channel constant current sinks with 66V
MOSFET, it could driving up to 36W of LED, suitable for use in 19
"to 24" LED Monitor backlight. Through master-slave architecture the
driving capability could extended to over 100W of LED, which is
enough for 30 "to 42" LED TV backlighting.
A732/A728, can control the external power switch to prevent Vin
inrush current, also provided output short circuit protection, and
to achieve true shutdown isolation, to avoid the LED light leakage
caused by the leakage current. A732/A728 supports two type of
dimming: DC voltage and pulse width modulation (PWM)；
PWM dimming could support up to 1000:1 dimming
range. Time shift for constant current sink channels on-and off,
reducing the interference generated by the dimming. Voltage feedback
mechanism to keep the driver IC at best efficiency mode, without
impact of LED forward voltage (VF) of the differences and
temperature change.
A732/A728 series, but also built-in multiple protection mechanisms:
LED open-circuit protection, LED short circuit protection, over
voltage protection, over current protection, thermal protection, and
undervoltage lockout protection (UVLO) and so on. In addition, the
external system can read the Status pin (A728) to understand if the
LED driver circuit protection action has occurred. Additional
information please visit ADDtek Web site (Web site: http://www.addmtek.com/).
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