Product category:
Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX16812
Edited by the Electronicstalk Editorial
Team on 27 September 2007
Dimming driver is bright answer for LEDs
Flexible HB LED driver is ideal for applications that require a wide dimming-control range, such as interior and exterior automotive lighting.
The MAX16812 is a high-voltage switch-mode high-brightness LED driver with analogue and PWM dimming control To minimise component count and cost, this device integrates a high-side/differential LED current-sense amplifier and a PWM-dimming MOSFET driver
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
Related stories
Speedy DAC claims dynamic superiority for comms
The MAX5195 is a 14bit 260Msample/s DAC claimed to provide the world's best dynamic performance in spurious-free dynamic range, intermodulation distortion and signal to noise ratio.
Low-power serial ADC runs up to 200Ksample/s
New from Maxim Integrated Products, the MAX1162 serial-interface 16bit A/D convertor connects directly to SPI, QSPI and Microwire devices without additional interface logic.
Additionally, it integrates a 76V-rated, 0.2ohm switching MOSFET and provides a wide, 100 to 500kHz operating-frequency range to ensure maximum flexibility.
The highly integrated, flexible MAX16812 is ideal for compact HB LED driver applications that require a wide, 100:1 dimming-control range such as interior and exterior automotive, emergency, architectural and other lighting applications.
The use of an internal dimming MOSFET driver enhances system reliability by automatically switching off power to the LED strings during automotive load-dump events.
To further enhance reliability and ensure even brightness matching, the MAX16812 provides +/-5% accurate LED-current control.
An onboard, 200Hz ramp generator allows PWM-dimming control with an external analogue signal, or it can be synchronised to an external PWM signal.
Linearly controlled PWM dimming greatly simplifies implementation of two-level brightness control and theatre dimming.
During PWM dimming, the MAX16812 controls the LED current rise and fall times to suppress electromagnetic interference (EMI) and system noise.
To further reduce EMI, an external resistor can be connected between the gate driver and internal switching MOSFET for control of the switching current rise and fall times.
Designed to withstand harsh operating environments, the MAX16812 operates from a 5.5 to 76V supply-voltage range, thus ensuring cold-start and load-dump compliance.
This HB LED driver also features overvoltage protection, undervoltage lockout, soft-start, and thermal shutdown.
The MAX16812 is fully specified over the -40 to +125C automotive temperature range, and is available in a thermally enhanced, 5 x 5mm, 28-pin TQFN package.
Prices start at US $2.10 (1000-up, FOB USA).
• Maxim Integrated Products: contact details and other news
• Email this article to a colleague
• Register for the free Electronicstalk email newsletter
• Electronicstalk Home Page
Search the Pro-Talk network of sites
