TLC5957 Texas instruments

TLC5957

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TLC5957

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Описание

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.

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

Features	48CH LED Driver, Error Flag, Fault Detection, LED Open Detection, LED Short to Ground Detection, LED Short to VLED Detection, PWM LED Driver, Thermal shutdown
Analog dimming steps	512
Data transfer rate (typ) (MHz)	33
Ch to ch accuracy (typ) (±%)	1
Rating	Catalog
Operating temperature range (°C)	-40 to 85