Linear Technology’s new LT8500 is a pulse width modulation (PWM) generator with 48 independent channels.
Each channel has an individually adjustable 12-bit (4096 steps) PWM register and a 6-bit (64 step) ±50% correction register. All controls are programmable via a simple TTL/CMOS 50 MHz serial data interface.
The IC can be used in a wide variety of PWM-intensive applications such as LED control, as well as industrial and robotic applications. For example, it can be used with three LT3595As, 16-channel LED drivers, to deliver 48 independently dimmed LED strings for locally dimmed LED backlighting for large LCD displays. The correction resister allows matching the light output of each LED string.
The LT8500 operates from a 3 V to 5,5 V input range, enabling it to operate from a wide range of standard power buses. For LED applications, each channel has individual 6-bit dot correction current adjustment and 12-bit grey scale PWM dimming. The 40 ns on-time of the device offers very wide dynamic contrast ratios. Both correction and grey scale dimming are accessible via a serial interface in TTL/CMOS logic.
The chip offers two diagnostic information flags: synchronisation error and open LED. The flags are sent with additional state information, on the serial data interface during status read back. The 50 MHz cascadable serial data interface includes buffering and skew balancing, easing the design for PWM-intensive applications such as large screen LCD dynamic backlighting. The combination of minimal externals and a 5 x 9 mm QFN package provide a highly compact solution footprint for multichannel PWM applications.
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