Timeline for Is this regulator a suitable replacement for original one?
Current License: CC BY-SA 4.0
12 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 19, 2020 at 6:51 | vote | accept | Alexey Kamenskiy | ||
| Jan 6, 2020 at 13:26 | comment | added | bobflux | The device that requests 20V could have an internal DC-DC converter to generate 5V or 3V3 that you could use | |
| Jan 6, 2020 at 12:46 | comment | added | Alexey Kamenskiy | @Chupacabras I think you missed the sentence where I explicitly said that this circuit feeds on power passing through between two other devices. What those devices and whether the sink requests PD of 20V - is not part of this specific device. | |
| Jan 6, 2020 at 12:44 | comment | added | Chupacabras | You will get 5V out of USB-C by default. You will receive higher voltage only if you request for that. Are you using some specialized IC for that? No? Don't worry about voltages higher than 5V. | |
| Jan 6, 2020 at 12:05 | comment | added | bobflux | 5W dissipation requires large heatsink, not compatible with portable electronics... A switching regulator would be better. | |
| Jan 6, 2020 at 11:03 | answer | added | Andy aka | timeline score: 2 | |
| Jan 6, 2020 at 10:50 | comment | added | Alexey Kamenskiy | So at the worst case scenario (max 20 V and 300 mA) there would be about 5W of power dissipation. I can't seem to find any numerical reference as at what level will my regulator need a heatsink. However this regulator has a large die pad on the bottom that I already imagine is made for heat dissipation. | |
| Jan 6, 2020 at 10:44 | comment | added | Alexey Kamenskiy | It definitely would not draw more than 300 mA at any circumstances. | |
| Jan 6, 2020 at 10:41 | comment | added | Alexey Kamenskiy | @peufeu that's a fair question, I've picked said TI regulator as it can output at max 500 mA, my circuit draws between 100-200 mA depending on the workload. One thing I seen online is recommendation to use mini-heatsinks for those TO-252 (or is it DPAC2) packages. I may consider adding one if needed though. | |
| Jan 6, 2020 at 10:41 | comment | added | Justme | How much current do you need from the regulator output? Have you calculated power dissipation in that case so the regulator does not overheat and melt? | |
| Jan 6, 2020 at 10:38 | comment | added | bobflux | Power dissipation in your regulator is (Vin-Vout)*Current so the answer will depend on how much output current is required. | |
| Jan 6, 2020 at 10:34 | history | asked | Alexey Kamenskiy | CC BY-SA 4.0 |