DS90UB934-Q1: DS90UB933-Q1 + DS90UB933-Q1 Schematic Review (Extended board)

Can you help update?

hi Jiashow,

I have found that 2 design guides are different, which one should I follow? What is the timing of the use of both designs? (TI 964/TI934 on the system side uses 4.7uH+100uH)

4.7uH+100uH

http://www.ti.com/lit/df/tidrqp8a/tidrqp8a.pdf?ts=1590726809082

http://www.ti.com/lit/df/tidrs06a/tidrs06a.pdf?ts=1590726919961

 Only 47uH

http://www.ti.com/lit/ug/snlu210b/snlu210b.pdf

Hi

How to choose the value of L2? (For Figure 42)

Hello Ben

 Values for L2 are given in the table below Fig.42. I

Thanks

Vijay

hi Vijaya,

If I am using 47uh for my PCB, do you have any suggestions? (There is no 100uh slot reserved.)

Hi

  So L2 can be 4.7uH. We have given two recommended manufacturers that are automotive qualified for L2 values. So that should be OK

Inductor, 4.7 µH, 0.350 Ω maximum, 700 mA minimum (Isat, Itemp) 160-MHz SRF typical, 3.8 mm x 3.8 mm, AEC-Q200 1008PS-472KL Coilcraft Inductor, 4.7 µH, 0.130 Ω maximum, 830 mA minimum (Isat, Itemp), 70-MHz SRF typical, 3.2 mm × 2.5 mm, AEC-Q200 CBC3225T4R7MRV Taiyo Yuden

Thanks

Vijay

hi 

So you suggest to replace 47uH to 4.7uH, Right?

By the way, why is the R2 suggested value of 1k or 2k how to choose it?