Product Overview
16-Channel Constant-Current Sink PWM LED Driver IC HTSSOP-28
Condition
Unused new old stock. Markings legible: TLC5940 with Texas Instruments logo. Visual inspection confirms straight, undamaged surface-mount leads. Sold each.
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Product Overview
Texas Instruments TLC5940PWP is a 16-channel constant-current sink LED driver designed for precision illumination control and display backlighting. Each channel provides individual 12-bit (4096-step) PWM grayscale control alongside 6-bit dot correction with on-chip EEPROM data retention. Output channels sink up to 120 mA each, supporting multi-drop serial cascading at data clock rates up to 30 MHz. Housed in a thermally enhanced 28-pin PowerPAD HTSSOP package for reliable heat dissipation in high-density boards.
Key Features
- 16 constant-current sink output channels rated up to 17 V
- Sink current capability up to 120 mA per channel at VCC above 3.6 V (60 mA below 3.6 V)
- 12-bit (4096-step) PWM grayscale brightness control per output
- 6-bit dot correction per channel with integrated EEPROM memory
- Serial data interface operating at frequencies up to 30 MHz
- Integrated diagnostics including LED open detection (LOD) and thermal error flag (TEF)
- Thermally enhanced 28-pin HTSSOP (PWP) surface-mount package
Applications
- Soldering onto custom control boards for large-format RGB LED matrix video displays
- Driving high-channel-count hobbyist micro-servo arrays or animation rigs via PWM timing
- Replacing failed driver stages in industrial annunciator panels and dynamic backlighting units
Frequently Asked Questions
What logic supply voltage is required for the TLC5940PWP?
Logic supply voltage (VCC) operates from 3.0 V to 5.5 V, allowing direct compatibility with 3.3 V and 5 V microcontroller systems.
Does the TLC5940 require an external current-setting resistor?
Yes. A single external resistor connected from the IREF pin to ground sets the maximum sink current limit across all 16 channels simultaneously.
How many channels does one IC control?
One TLC5940PWP controls 16 individual channels. To control a full 64-channel array, four chips are cascaded together in serial.
Solid PWM control and clean current sinking make this driver an enduring bench favorite for taming dense grids of light. Wire your serial line, trim your IREF resistor, and let the matrix run.
