Other Parts Discussed in Thread: PMP15037, TPS61175
Hi, I'm trying to use the TPS55340PWPR boost converter. I have to use a Li-ion 3.7V single cell battery input for creating a 30.6V output.
From my previous post, I have received a solution to this.
Just to double check, I wish to ask some questions when using the TPS55340 and these equations.
Q0. V FB of TPS55340 is also 1.229 V, right? I can't find this number from the datasheet's electrical specification, but I guess this from Equation 24: Vout = 1.229V * (1+R1/R2)
Q1. For the SYNC(Switching frequency synchronization pin), this pin should be tied to AGND because I'm not using any external clock signal.
What is the DNC pin in the WEBENCH? I cannot find this from the datasheet.
Q2. Using PMP15037's equations, I get
R1 = 240k, R2 = 14.5k, R3 = 32k for VOUT 6.56 ~ 30.788 V
Can I still apply the same equation when using the TPS55340 and use a DAC (0 ~ 3.3V) to control VOUT?
Q3. Lastly, for the output capacitors, the WEBENCH showed 10uF, 470nF, 470nF. Can I add a single 12uF / 14uF / 15uF / 20uF instead?
When reading these applications, I had a question whether we can replace this to a single capacitor. (For instance in FIgure 16, three 4.7uF to 15uF or 20uF)
