Hi Mario,
Maybe I wasn't clear. The TPS61081 that drives the backlight is connected as a LED driver, so it will output a constant current. The question is are the backlights of the two displays identical regarding number of LEDs used and their configuration…
Hi Biser,
As you said "
It's a PWM signal, like shown on the TPS61081 datasheet, Figure 24 ( http://www.ti.com/lit/ds/symlink/tps61081.pdf ). It's driven by the processor signal eCAP2_in_PWM2_out (pinmux Mode 4) on pin C12. "
how could I drive…
You can have a look at TPS61080 and TPS61081, The Vin also disconnect with Vout if EN is off. The device have a internal recitify diode.
yes, my calculation result is almost the same as yours according to datasheet.
Jasper li
Hi Shane,
First off, thank you for your interest and evaluation of TI's TPS61081.
As for your EVM modifications, you are on the right track. I am not sure if you require the POT for if you have a wide variety of resistors you can possibly just do…
Hi Andrew,
The LMR36015 is internally compensated. The feed forward capacitor (Cff) placed across the top feedback resistor is used to as a way to boost phase margin and increase transient performance. For more information on the role of Cff please…
Hi,
Maybe you can add more output capacitors and add a suitable feedforward capacitor to get faster loop response. Thanks.
8737.Design Feedforward Capacitor for LMR14020.pdf
7288.Optimizing Transient Response of Internally Compensated DC-DC Converters…
Thanks Jeff for clarifying that.
Colin,
If you need 240 mA through your LEDs, we cannot recommend using the TPS61166. Will the TPS61081 meet your needs?
Another option, if you don't need PWM dimming, is to bypass the OLP FET by connecting Vo…
Part Number: LMR33630CRNXEVM
Hi Expert
I tried to understand the CFF calulate and I have some question need your help
the equation shows below in datasheet : my Cout : 66uF, VREF=1V, Vout=3.3V, RFBT=100K , chip freq=2MHz , Loading current from 150mA…
