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TLC5916IPWR Datasheet(PDF) 1 Page - Texas Instruments |
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TLC5916IPWR Datasheet(HTML) 1 Page - Texas Instruments |
1 / 30 page www.ti.com FEATURES APPLICATIONS DESCRIPTION/ORDERING INFORMATION TLC5916, TLC5917 8-BIT CONSTANT-CURRENT LED SINK DRIVERS SLVS695 – JUNE 2007 • Eight Constant-Current Output Channels • 30-MHz Clock Frequency • Output Current Adjusted Through External • Schmitt-Trigger Input Resistor • 3.3-V or 5-V Supply Voltage • Constant Output Current Range: • Thermal Shutdown for Overtemperature 5 mA to 120 mA Protection • Constant Output Current Invariant to Load Voltage Change • General LED Lighting Applications • Open Load, Short Load and Overtemperature Detection • LED Display Systems • LED Signage • 256-Step Programmable Global Current Gain • Automotive LED Lighting • Excellent Output Current Accuracy: • White Goods – Between Channels: < ±3% (Max) • Gaming Machines/Entertainment – Between ICs: < ±6% (Max) • Fast Response of Output Current The TLC5916/TLC5917 is designed for LED displays and LED lighting applications with constant-current control and open-load, shorted-load, and overtemperature detection. The TLC5916/TLC5917 contains an 8-bit shift register and data latches, which convert serial input data into parallel output format. At the output stage, eight regulated current ports are designed to provide uniform and constant current for driving LEDs within a wide range of VF variations. Used in system design for LED display applications, e.g., LED panels, it provides great flexibility and device performance. Users can adjust the output current from 5 mA to 120 mA through an external resistor, Rext, which gives flexibility in controlling the light intensity of LEDs. The devices are designed for up to 17 V at the output port. The high clock frequency, 30 MHz, also satisfies the system requirements of high-volume data transmission. The TLC5916/TLC5917 provides a Special Mode in which two functions are included, Error Detection and Current Gain Control. There are two operation modes and three phases: Normal Mode phase, Mode Switching transition phase, and Special Mode phase. The signal on the multiple function pin OE(ED2) is monitored to determine the mode. When an one-clock-wide pulse appears on OE(ED2), the device enters the Mode Switching phase. At this time, the voltage level on LE(ED1) determines the mode to which the TLC5916/TLC5917 switches. In the Normal Mode phase, the serial data can be transferred into TLC5916/TLC5917 via the pin SDI, shifted in the shift register, and transferred out via the pin SDO. LE(ED1) can latch the serial data in the shift register to the output latch. OE(ED2) enables the output drivers to sink current. In the Special Mode phase, the low-voltage-level signal OE(ED2) can enable output channels and detect the status of the output current, to determine if the driving current level is sufficient. The detected Error Status is loaded into the 8-bit shift register and shifted out via the pin SDO along with the CLK signal. The system controller can read the error status and determine whether or not the LEDs are properly lit. In the Special Mode phase, the TLC5916/TLC5917 allows users to adjust the output current level by setting a runtime-programmable Configuration Code. The code is sent into the TLC5916/TLC5917 via SDI. The positive pulse of LE(ED1) latches the code in the shift register into a built-in 8-bit configuration latch, instead of the output latch. The code affects the voltage at the terminal R-EXT and controls the output-current regulator. The output current can be finely adjusted by a gain ranging from 1/12 to 127/128 in 256 steps. Therefore, the current skew between ICs can be compensated within less than 1%. This feature is suitable for white balancing in LED color display panels. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCT PREVIEW information concerns products in the Copyright © 2007, Texas Instruments Incorporated formative or design phase of development. Characteristic data and other specifications are design goals. Texas Instruments reserves the right to change or discontinue these products without notice. |
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