Part Number: PTH04000W
There is a phenomenon that the PTH module's output voltage is shifts, At my customer.
Checking the OPEN / SHORT of the pin indicates that the ADJ pin is OPEN or the resistance value is misaligned.Since the occurrence mechanism and the cause of occurrence are investigating , please tell me only about the phenomenon.
＜Question＞· I think that the impedance fluctuation of the ADJ pin influences the output voltage, but is this consideration correct?· If there is a block diagram (may be a simplified diagram) of the internal circuit, please send.※I would like to discuss within the company's internal based on this.
Could you help us?
Best regards,masumi Sekiguchi
PTH04000W Voltage Rset ( Adj) when open ( no external Rset on pin 5 ) impedance to pin 1 (Gnd) is 1MEG Ω.
A . Questions. On this specific application.
A1.I request this complete specific customers schematic on PTH04000W circuit including all external connections.
A2. What is the Rset voltage ?
A3.How are they using the Autotrack pin 2 feature or is it connected directly to Vin (+)
A4. What are the identities external input (types) and total output capacitors( polarized and ceramic plus their capacitance value?
A5. Is the inhibit pin 4 open or controlled with an external open drain FET?
PTH04000Wxx set point voltage tolerance per the product specification electrical characteristics
Is ± 2% when the Rset resistor has a tolerance of 1% with 100PPM /°C or better temperature stability.
The total output voltage variation when using this resistor tolerance characteristics is ±3%.
And note 3 in the product specification.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.