Hi,
We are using the MPQ3367GRE-AEC LED driver IC and we need to know that is it possible to use I2C alone for brightness control without using the PWM input??
Becoz our primary goal is to control led brightness using I2C alone and without PWM.
So give me a solution if possible
Hi @dhanush ,
PWM input is required for dimming. Dimming cannot be done through I2C alone, changing some register values cannot change the effective RMS current sent to the LEDs.
Regards,
Jonathan
Hello @Jonathan.Hidalgo
I gave PWM input signal but the IC is not starting to boost up.
the current on the out is very low and VIN voltage(12v) is same as the VOUT voltage(12v)
What will be the basic requirements for the IC to start the boosting process??
Then what is the purpose of I2C lines in the ic ? PWM pin is enough for dimming then purpose of I2C lines are?
We are currently working with this IC (MPQ3367). This IC has internal boost circuit.
I give more details for your understanding,
1)MIX/AD [pin no :2] pin is in floating condition.
2)FREQ/SYNC [pin no :3] pins connected to ground via 44.2k resistor ,in use of 44.2k only we get 500kHz frequency.am I right?
I measure the voltage between SW and GND ,it will show 12V only, I think the internal Mosfet is not switching…
when i will get boosted output (above 18V) at pin SW ??
All the 4 registers are having their default value, then why boosting is not happen??
Dear @Jonathan.Hidalgo &@dhanush In our design also we are facing the same issue we are providing the input as 12V but I have getting same voltage as @dhanush said and also we monitor some other parameters like vcc pin of mpq we are getting 5v which is generated from internal regulator, ff pin is 0V , sd pin is 5.82V,comp is 0V,sth pin is 0.4V, mix / AD pin is 0.58V , we genearating pwm In DIM pin from soc but i cant able to see the waveform which is measured using picoscope it is pulled low and also i have checked continuity between dim pin and gnd it is showing short. If you have solved these kind of issues please support us to rectify it
Note: I have attached my sch and calculation sheet for your reference.
Thanks in Advance
Looking forward for your support
