Analog Evaluation
13
SLVUBT6A – October 2019 – Revised May 2020
Copyright © 2019–2020, Texas Instruments Incorporated
Using the TPS8804EVM
Figure 12. LED Power Supply Settings
Configure the PWM pulse settings for the LED driver. The default setting 201 ms pulse rate and 1 ms
pulse width sufficiently tests the LED driver. This setting controls the PWM signal from the USB2ANY
adapter to the EVM.
Configure the LED current for each driver. The default EVM CSA resistance is 10
Ω
and the default EVM
CSB resistance is 1.3
Ω
. These resistors can be switched on the EVM to change the LED current and
temperature compensation. Set the DAC voltage to fine tune the LED current. Set the temperature
coefficient to the required setting. Click
SETUP TEST
after configuring the photo amplifier, LED power
supply, and LED driver.
