Other Parts Discussed in Thread: TPSM843521, TPSM84338, TPSM843321,
Tool/software:
Hello
- When reviewing the TPSM data sheet on page 15 (https://www.ti.com/lit/ds/symlink/tpsm84538.pdf?ts=1745956747811#page=15), I noted the table comparing Fsw to Voltage Output. To get the max voltage (5V) for this part fSW has to be set to 1400kHz or higher. This doesn't match up with the typical application where fSW is set to 1000kHz via the 0 ohm resistor on page 23 (www.ti.com/.../tpsm84538.pdf. Even though the part used in the typical application is TPSM843521(www.ti.com/.../tpsm843521.pdf it still has the same requirement of setting Fsw to 1400kHz to get a 5V output. Could this clarified or is this a typo? I think this is a typo and all the parts should all be TPSM84338 which can get up to 5V output at 1MHz Fsw.
- Could further information be provided on the resistance column in Table 6.2 (www.ti.com/.../tpsm84538.pdf. Is this the value of the external resistor from RT to ground? Again there seems (to me) some discontinuity between this table and the typical app which has a 0k to ground.
- This document of TPSM843321 (https://www.ti.com/lit/ds/symlink/tpsm843321.pdf?ts=1742441842160#page=24) has C7 and C10 removed. Is this the most recent? Should that apply to all the other Typical Application sections in the corresponding documents?
- What is the purpose of R3 the 49.9ohm resistor on page 23 www.ti.com/.../tpsm84538.pdf
- The WEBench hasn't been updated for either the TPSM84538 or the TPSM843521 so it seems odd to link to it and mention that a custom design could me made with the specific part. I think it only applies to the TPSM84338.
- To be picky, the recommended RFBB is 10kohm www.ti.com/.../tpsm84538.pdf yet the Typical application uses an RFBB of 30kohm https://www.ti.com/lit/ds/symlink/tpsm84538.pdf?ts=1745956747811#page=24
