This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
LP5024: LP5024_Init or Control
Part Number: LP5024
I got customer complain about TLC5947 flicker issue.
The end customer uses the camera to take light from the TLC5947. The screen light that the user sees the camera will flicker.
My customer are searching whether there is higher frequency than 4M Hz on PWM LED Driver IC, or other solution without PWM dimming. Below IC that has 4MHz Internal Oscillator is used in existing product.
I recommend using the LP5024 because the LP5024 has Phase shift technology. Can PWM Phase shift solve this problem?
Can you share schematic of your typical application circuit? Can you explain it in more details about flicker issues of TLC5947? These information will be helpful for solving problems.
Thanks and best regards, Charles Chen Applications Engineer | LED Drivers
Check out these helpful resources
LED Drivers ICs | LED Drivers Reference designs | LED Driver Basics Training series
We are glad that we were able to resolve this issue, and will now proceed to close this thread.
If you have further questions related to this thread, you may click "Ask a related question" below. The newly created question will be automatically linked to this question.
In reply to Charles-Chen:
- Detailed application specifications:- LED string : Cold: 6LED series/5LED series Amber: 5LED series/ 5LED series- Current : 20 mA- PWM frequency : ~976HzDuty : (1), 1 ON, 4095 OFF ; (2), 2048 ON, 2048 OFF (3), 4000 ON, 96 OFF .
In reply to Kami Huang60:
Do flicker issues happen in all three duty cycles（1/4096，2048/4096，4000/4096)? The PWM frequency of LP5024 is 29 kHz, which may improve the problem. However, Duty cycle of 1/4096 is achieved by dithering in LP5024, which is an approximation result for 12 bits of PWM grayscale control.
PWM phase shift mainly aims to reduce the amplitude of peak load current. Low PWM frequency may be the main reason causing flick issues when you shoot with a camera, even if you use device in a correct way.
I'll close this thread due to inactivity and if you have more questions please reply to it directly and it will open again.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.