Tool/software:
Hi Teams,
I would like to know about the design of the UVP resistor divider.
In the following thread, it was mentioned that the design should ensure the voltage is above 1.4V.
[FAQ] How to design the UVP resistor divider for TPS922055 / TPS922054 / TPS922053 / TPS922052?
However, section 8.3.6 of the manual states the following:
>> When VUVP is above the CC threshold VCC_TH determined by users,
>> the device performs as a controllable constant current source and generates a relatively low output current controlled by a low-duty-cycle PWM signal at ADIM/HD pin for pre-charge.
>> When VUVP is below VCC_TH but above 1.4 V, the device generates a relatively high output current controlled by a high-duty-cycle PWM signal at ADIM/HD pin for CC operation.
I would like to ask the following questions:
1. What is the voltage of VCC_TH?
2. Should VCC_TH be considered?
3. Given the following specifications, according to the guideline, if R_UVP1=1MegΩ and R_UVP2=1MegΩ, VUVP would be 2.4V (>1.4V). Is this correct?
- VIN: 12V
- Total Vf (LEDs): Maximum 7.2V
Thanks,
Maru