Other Parts Discussed in Thread: TPS92691
Hello, we are using TPS92691-Q1 chip to dim the LED. Need to reduce the LED brightness (corresponding to the LED current is 10mA), choose the analog and PWM mode dimming. How do I set it up?
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Hello, we are using TPS92691-Q1 chip to dim the LED. Need to reduce the LED brightness (corresponding to the LED current is 10mA), choose the analog and PWM mode dimming. How do I set it up?
Hello,
Depending on the dimming mode you choose and whether it's analog or PWM dimming. Please see section 7.3.7 for analog dimming and 7.3.8 for PWM dimming.
Thanks Tuan
hello,You mean that the dimming method is either analog dimming or PWM dimming. The two cannot be used together, right?
Hello,
You can use both PWM dimming and Analog dimming methods together.
Thanks Tuan
Hello, I designed the circuit according to the above figure. I designed fixed resistors Radj1 and Radj2 to make Iled=500mA. The output range of Iled is 20mA~1000mA through PWM dimming method, there are the following questions:
1. Is this design reasonable?
2. How to determine the minimum and maximum of Iled?
3. Can you fill out and send me the TPS92691_Boost_Design_Calculator.xls file according to my needs (see the figure below) and your suggestions?
4. Thank you very much.
Hello,
I can help you answer your questions and provide information along with design equations in the data sheet for you to do your own design. We will not do the design directly for you.
If you have issue please follow the data sheet...There are equations and information in there to help you with the design. We also have an evaluation board that you can get and use to help you with the design.
https://www.ti.com/tool/TPS92692EVM-880?keyMatch=TPS92692&tisearch=Search-EN-everything&usecase=GPN
Thanks Tuan