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Two-channel boost LED driver from Supertex allows channel-independent PWM dimming of LCDs
Supertex has introduced HV9880, a two-channel, boost LED driver with LED wire fault detection and channel-independent pulse width modulated (PWM) dimming, that enables separate LED strings to be operated at different PWM duty cycles for colour mixing in LCD applications.
The HV9880 is a current mode control LED driver IC designed to control two boost LED drivers in constant frequency mode. The controller uses a peak current-mode control scheme and includes internal transconductance amplifiers to accurately control the output currents over all line and load conditions. The IC also provides disconnect switch gate drivers, which can be used to achieve good PWM rise and fall times for the LED currents using external disconnect FETs.
HV9880 also provides two, independent TTL compatible, low-frequency PWM dimming inputs which can accept external control signals with a duty ratio of 0-100% and a frequency of up to a few kilohertz.
HV9880 includes a wiring fault detection function that sends a flag to the boost input power supply in case of an LED wiring fault, and features a peak mode current control scheme that controls output current within +/-3% accuracy over all line and load conditions.
“Supertex’s HV9880 allows independent control of dimming and colour mixing, resulting in better picture resolution and higher contrast ratio,” states Stephen Lin, Vice President of Marketing for Supertex. “It also features wiring fault protection, meaning that no high side current sensor is needed in the circuit, thus reducing system cost and complexity.”
HV9880 is available in a 24-lead SOW package (HV9880WG-G) and is RoHS compliant.
For more information, or details on the full range of Supertex products available from Anglia, please call +44 (0)1945 474747 or email info@anglia.com
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This news article was originally published in April 2011.
