In order to making use of TPS61194 for the Backlight of Automobile. However there are some design issues about the TPS61194-Q1.
Would you like to help me figure out several factors that contribute to the above questions?
Q1: Why LCD screen blink both in the state of PWM<20% and in the state of PWM>70%?
RE: ?
Q2: What’s trigger the table phenomenon?
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The LCD screen |
PC software |
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Normal state (no blinking) |
Step 1、set PWM=75% from PWM=70% Step 2、set EN=0,then set EN=1（3.3V） |
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Off normal state (blinking) |
Step 1、set EN=0,then set EN=1（3.3V） Step 2、set PWM=75% from PWM=70% |
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RE: ?
Framework Diagram:
I need help filling out the question about TPS61194Q .pdf
PC software:
Backlight Unit: （LED：11S4P）
Schematic:
PCB:
