TLC5925 Low-Power 16-Channel Constant-Current LED Sink Driver
1 Features
- 16 Constant-Current Output Channels
- Constant Output Current Invariant to Load Voltage Change
- Excellent Output Current Accuracy:
- Between Channels: < ±4% (Max)
- Between ICs: < ±6% (Max)
- Constant Output Current Range:
3 mA to 45 mA - Output Current Adjusted By External Resistor
- Fast Response of Output Current, OE (Min): 100 ns
- 30-MHz Clock Frequency
- Schmitt-Trigger Inputs
- 3.3-V to 5-V Supply Voltage
- Thermal Shutdown for Overtemperature Protection
- ESD Performance: 1-kV HBM
2 Applications
- Gaming Machine and Entertainment
- General LED Applications
- LED Display Systems
- Signs LED Lighting
- White Goods
3 Description
The TLC5925 is designed for LED displays and LED lighting applications. The TLC5925 contains a 16-bit shift register and data latches, which convert serial input data into parallel output format. At the TLC5925 output stage, 16 regulated-current ports provide uniform and constant current for driving LEDs within a wide range of VF variations. Used in system design for LED display applications (such as, LED panels), the TLC5925 provides great flexibility and device performance. Users can adjust the output current from 3 mA to 45 mA through an external resistor, Rext, which gives flexibility in controlling the light intensity of LEDs. TLC5925 is 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 serial data is transferred into TLC5925 via SDI, shifted in the shift register, and transferred out via SDO. LE can latch the serial data in the shift register to the output latch. OE enables the output drivers to sink current.
Device Information (1)
| PART NUMBER | PACKAGE | BODY SIZE (NOM) |
|---|---|---|
| TLC5925 | SSOP (24) | 8.65 mm × 3.90 mm |
| SOIC (24) | 15.40 mm × 7.50 mm | |
| TSSOP (24) | 7.80 mm × 4.40 mm |
- For all available packages, see the orderable addendum at the end of the datasheet.
Typical Application
4 Revision History
Changes from A Revision (March 2013) to B Revision
- Added Pin Configuration and Functions section, ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section Go
5 Pin Configuration and Functions
Pin Functions
| PIN | I/O | DESCRIPTION | |
|---|---|---|---|
| NAME | NO. | ||
| CLK | 3 | I | Clock input for data shift on rising edge |
| GND | 1 | — | Ground for control logic and current sink |
| LE | 4 | I | Data strobe input Serial data is transferred to the respective latch when LE is high. The data is latched when LE goes low. LE has an internal pull-down resistor. |
| OE | 21 | I | Output enable When OE is active (low), the output drivers are enabled. When OE is high, all output drivers are turned OFF (blanked). OE has an internal pullup resistor. |
| OUT0 | 5 | O | Constant-current outputs |
| OUT1 | 6 | ||
| OUT2 | 7 | ||
| OUT3 | 8 | ||
| OUT4 | 9 | ||
| OUT5 | 10 | ||
| OUT6 | 11 | ||
| OUT7 | 12 | ||
| OUT8 | 13 | ||
| OUT9 | 14 | ||
| OUT10 | 15 | ||
| OUT11 | 16 | ||
| OUT12 | 17 | ||
| OUT13 | 18 | ||
| OUT14 | 19 | ||
| OUT15 | 20 | ||
| R-EXT | 23 | I | Input used to connect an external resistor (Rext) for setting output currents |
| SDI | 2 | I | Serial-data input to the Shift register |
| SDO | 22 | O | Serial-data output to the following SDI of next driver IC or to the microcontroller |
| VDD | 24 | I | Supply voltage |