TLC5957

• 48 Constant-Current Sink Output Channels
• Sink Current Capability with Max BC/CC data
  • 1~20mA (VCC = 3.3V)
  • 1∼25mA (VCC = 5V)
• Global Brightness Control (BC): 3-Bit (8 Step)
• Global Brightness Control (CC) for Each Color Group:
  9-Bit (512 Step), Three Groups
• LED Power Supply Voltage up to 10V
• VCC = 3.0 to 5.5V
• Knee Voltage Vout = 0.24V at 10mA
• Constant Current Accuracy
  • Channel to Channel = ±1%(Typ), ±3%(Max)
  • Device to Device = ±1%(Typ), ±2%(Max)
• Data Transfer Rate : 33MHz
• Grayscale Control Clock : 33MHz
• Pre-charge FET for Ghost Cancelling
• Enhanced Circuit for Caterpillar Cancelling
• Selectable Data Transfer Bit and PWM Bit (9 bit to 16 bit)
• Selectable Traditional PWM and ES-PWM
• LED Open Detection (LOD)
• Thermal Shut Down (TSD)
• Auto Display Repeat/Auto Data Refresh
• Delay Switching to Prevent Inrush Current
• Operating Temperature : –40°C to +85°C

The TLC5957 is a 48-channel constant current sink driver. Each channel has an individually-adjustable, 65536-step, pulse width modulation (PWM) grayscale (GS) brightness control.

The output channels are divided into three groups, each group has a 512 step color brightness control (CC), CC adjusts brightness between colors. The maximum current value of all 48 channels can be set by 8-step global brightness control (BC). BC adjusts brightness deviation between LED drivers. GS, CC and BC data are accessible via a serial interface port.

TLC5957 has one error flag: LED open detection (LOD), which can be read via a serial interface port. Each constant-current has a pre-charge field- effect transistor (FET), which can remove ghosting and improve display performance on the multiplexing LED display. Besides, TLC5957 has an enhanced circuit, it can cancel the caterpillar effect caused by LED open.

TLC5957 has a poker data transmission mode; GS data length can be configured from 9 bit to 16 bit according to PWM bits in each sub-segment. Poker Mode can significantly increase visual refresh rate in multiplexing applications.