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| Driver recommendation that has decent performance down to 2.5V... |
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| alank2:
So it would take more voltage than that for any sizeable amount of current to flow? Sounds like the chart/graph might be better to determine how much current for how much voltage... |
| thm_w:
--- Quote from: alank2 on November 29, 2019, 02:39:55 pm ---So it would take more voltage than that for any sizeable amount of current to flow? Sounds like the chart/graph might be better to determine how much current for how much voltage... --- End quote --- Correct, figure 2, 250mA ~4.5V. Or 0.6A at 6V. TN5325N3 bit better at 0.6A 4.5V: http://ww1.microchip.com/downloads/en/DeviceDoc/20005709A.pdf Seems like no TO-92 is going to be ideal though. |
| alank2:
Will a BJT be any better at what I am looking at? Does it depend on the base drive strength? |
| thm_w:
It looks like it would be better at low voltages yeah, at the cost of efficiency and higher IO output current requirement. MPSA05: Vbe = 1.2V Hfe = 100 5mA base current at 2.5V = 260R base resistor Base current at 5V = 15mA |
| mariush:
Would you be able to make a single exception for a SOT-23-5 / SOT-23-6, or maybe you'd consider using a SOT-23 to DIP8 adapter pcb? You could basically use a switching regulator to boost any voltage to 3.3v or 5v and then your hassles are over. Or have the microcontroller or whatever power everything directly if the voltage is higher than 3v (use a mosfet or something to power the rest), or enable a switching regulator to boost to 3.3v if the voltage is below 3v. You can get SOT-23-5 regulators like AP301 or SOT-23-6 regulators like AP1603 or MCP1640 They don't have the same pinouts, but if you make your adapter boards you can easily make your own pinout (rearrange the pins) You can easily find SOT-23 to DIP pre-made boards, here's an example - 20pcs for 2.5$: https://www.ebay.com/itm/20pcs-6-pin-SOT23-TO-DIP-Adapter-PCB-Socket-Breakout-Convertor-Board/332579763865 |
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