| Electronics > Beginners |
| How to choose a resistor? |
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| tggzzz:
--- Quote from: redgear on November 02, 2019, 06:48:07 am --- --- Quote from: tggzzz on November 01, 2019, 11:46:33 am ---V2/R, where R is the supply voltage. For R2/R7, reduce V by one LED forward voltage drop. --- End quote --- Do you mean V is the supply voltage? --- Quote from: tggzzz on November 01, 2019, 11:46:33 am ---RNTC is interesting; NTC may mean negative temperature coefficient, which implies a thermistor. Unfortunately thermistors are made with differing tempcos, so the best bet would be one with a tempco in the middle of the possible values. --- End quote --- Yep, RNTC is a thermistor and they are 100K @ 25deg with a material constant of 4200 --- Quote from: tggzzz on November 01, 2019, 11:46:33 am ---Google can be useful when looking at foreign language datasheets. --- End quote --- I have been using Google Translate. But a lot of information is given as a image and I am not able to translate them. --- End quote --- Yes, V :( Given that information, use DigiKey to find a thermistor. Bummer. |
| PA0PBZ:
--- Quote from: redgear on November 02, 2019, 06:48:07 am ---I have been using Google Translate. But a lot of information is given as a image and I am not able to translate them. --- End quote --- Try the Google translate app for IOS/Android, it translates using the camera. I tried it on the text in the diagram and it works fine. |
| Gallardo:
Hope it helps you ;) R1 to VOUT1, R1 to VOUT2, R1 to VBUS, R1 to VIN four lines need to be separated from the R1 pad, the current path of the four lines can not have any coincidence, otherwise it will affect the multi-port change single port is automatic recovery fast charge function . Note that the power path traces need to be as short and wide as possible, and the line width needs to be at least 80 mils. When the NTC function is not used, R12 is replaced with 51KOhm, and RNTC does not need to be installed. |
| Gallardo:
for reference |
| redgear:
--- Quote from: Gallardo on November 08, 2019, 05:19:31 am ---Hope it helps you ;) R1 to VOUT1, R1 to VOUT2, R1 to VBUS, R1 to VIN four lines need to be separated from the R1 pad, the current path of the four lines can not have any coincidence, otherwise it will affect the multi-port change single port is automatic recovery fast charge function . Note that the power path traces need to be as short and wide as possible, and the line width needs to be at least 80 mils. When the NTC function is not used, R12 is replaced with 51KOhm, and RNTC does not need to be installed. --- End quote --- Thanks. But from the connections shown R1 is not connected to either of VIN, BUS, VOUT1 or VOUT2. :-// I still have few more questions on the same project. Would be great if you can help me. I have created a new thread for the same. |
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