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LT8500 -48-Channel LED PWM Generator with 12-Bit Resolution and 50MHz Cascadable Serial Interface

The LT®8500 is a pulse width modulation (PWM) generator with 48 independent channels. Each channel has an individually adjustable 12-bit (4096-step) PWM register and a 6-bit (64-step) ±50% correction register. All controls are programmable via a simple serial data interface. Three banks of 16-channels each can be configured such that they operate 120° out-of-phase with each other.

The LT8500 features two diagnostic information flags: synchronization error and open LED. The flags are sent, with additional state information, on the serial data interface during status read back. The 50MHz cascadable serial data interface includes buffering and skew-balancing, making the chip suitable for PWM intensive applications such as large screen LCD dynamic backlighting and mono-, multi- and full-color LED displays. The LT8500 is also ideally suited to control three LT3595A LED drivers.

Features 3V to 5.5V Input Voltage 48 Independent PWM Outputs TTL/CMOS Logic 50MHz Serial Data Interface 12-Bit (4096 Steps) PWM Width Resolution 6-Bit (64 Steps) PWM Correction (±50% of Programmed PWM Width) Up to 6.1kHz PWM Frequency (PWMCK = 25MHz) Phase-Shift Option Reduces Switching Noise Directly Controls Three LT3595A 16-Channel LED Drivers Diagnostic Information: Sync Error/Open LED Flags 56-Pin (6mm × 6mm × 0.78mm) TLA QFN Package Typical Application

Applications Large Screen Display LED Backlighting Mono-, Multi-, Full-Color LED Displays LED Billboards and Signboards Motor Control Industrial Control Automated Test Equipment Robotics Packaging

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