Product category:
Power Supply ICs and Controllers
News Release from: Solid State Supplies | Subject: LX1695
Edited by the Electronicstalk Editorial
Team on 21 April 2004
Supervisor provides budget backlight
control
The LX1695 supervisor circuit provides a low-cost way to add advanced digital dimming and fault protection functions to conventional inexpensive switched Royer CCFL inverter modules.
Described as an advanced supervisor integrated circuit for inverter modules used to power single or multiple cold cathode florescent lamps in desktop monitor and LCD TV applications, the new LX1695 supervisor circuit from Solid State Supplies, provides a low-cost way to add advanced digital dimming and fault protection functions to conventional inexpensive switched Royer CCFL inverter modules The LX1695 digital dimming circuitry converts a DC control voltage to a single pulsewidth modulated (PWM) output that is used to turn Royer oscillators on and off at duty cycles from 5 to 100%
This article was originally published on Electronicstalk on 6 Feb 2001 at 8.00am (UK)
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The desired PWM frequency is set by a resistor-programmed internal oscillator, or by an external clock.
The LX1695 design includes a protection circuit that shuts off the Royer oscillator if lamp ignition does not occur in a timely manner, or in the event of one or more faulty lamps.
The output pin is easily expanded with external transistors to drive any number of Royer circuits, giving a single LX1695 device the ability to control very large displays for LCD TV applications.
"I expect this new supervisor chip will find a warm welcome among designers of low-end LCD monitor and television products", said Phil Masters from Solid State Supplies.
"We believe it provides the industry's easiest and lowest cost way to provide wide range dimming for these displays", he added.
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