DLP4621Q1EVM: Inquiry on ADC measurement at DLP230 Control Program

Jeremiah,

https://www.ti.com/product/TPS99000-Q1

Section 6.3.3 describes the ADC function in the TPS99000.  It will measure the input once per video frame.   How and what are you trying monitor more exactly?

I have asked another colleague to assist.  Please note that most people are not in the office this week.

Jason

Thanks for reply. Is it available that I know conversion equations of ADC measurement related to LED power?

I'm trying to drive Laser diode whose forward voltage and current are ~17V and 2A with the development board based on DLP4621EVM's HL driver. 

So if I know this meaning of conversion equation ADC measurements related to LED driving, it'll help for me to tune my design. 

e.g. In case of that Vf = 17V and If = 2A, ADC measurements of VLED shall be 0.xxx.and ILED control DAC shall be 0.xxx

Jeremiah,

The HL Driver board only support up to around 8-9V forward voltage for driving the LED or Laser.  The entire power supply scheme would need to modified to support higher driver voltage, the design would need to change to have a boost converter power supply.  The design assume today a 13V battery with dips down to ~9V or so.  In the case of 17V driver, the power supply would need to boost up the voltage to 18-19V.  

The ADC sampling should occur to measure the Laser voltage indirectly.  For example, using a voltage divider to reduce the to range of 3V or so.

Let us know if this makes sense.

Jason

Thanks for your feedback. The borad which I'll modify is DLP006-001C_Headlight_LED_Driver which supports 16V and 6A max. Could you let us know how to supply 16V and 6A at DLP4621EVM? It could be measured with 14V and less than 1A with DLP4621EVM at this moment. This is because I'm not using ACP properly.