TLC5946PWR datasheet by Texas Instruments

TLC5946PWR Frequently Asked Questions (FAQs)

• What is the maximum current that can be sourced by each output?
  The TLC5946PWR can source up to 60mA per output, but it's recommended to limit it to 40mA to ensure reliable operation and prevent overheating.
• How do I properly sequence the GSCLK, SCLK, and XLAT signals during startup?
  During startup, GSCLK should be low, SCLK should be high, and XLAT should be low. Then, bring GSCLK high, followed by SCLK low, and finally XLAT high. This ensures proper initialization of the device.
• What is the purpose of the VPRG pin, and how should it be connected?
  The VPRG pin is used to set the internal voltage reference for the device. It should be connected to a voltage source between 1.2V and 3.3V, or left unconnected to default to an internal 1.2V reference.
• How do I handle thermal shutdown and overheating protection?
  The TLC5946PWR has a built-in thermal shutdown feature that turns off the outputs when the device overheats. To handle this, monitor the THERMAL_SHUTDOWN pin, which goes low when the device overheats. You can also implement external thermal protection using a thermistor or thermal sensor.
• What is the recommended layout and routing for the TLC5946PWR?
  To minimize noise and ensure reliable operation, it's recommended to keep the GSCLK, SCLK, and XLAT signals short and away from the output pins. Also, use a solid ground plane and decouple the power supply pins with capacitors.