Timeline for Electronic load, Problem turning MOSFET on
Current License: CC BY-SA 4.0
8 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jul 20, 2019 at 16:26 | vote | accept | Benjamin | ||
| Jul 10, 2019 at 22:49 | answer | added | Jack Creasey | timeline score: 3 | |
| Jul 10, 2019 at 22:08 | answer | added | Marko Buršič | timeline score: 1 | |
| Jul 10, 2019 at 22:08 | comment | added | rdtsc | "...the load to be variable [by] removing the heat sink from the MOSFET" - page 9 of the datasheet says the tab is connected to the Drain. Is the heat sink shorting out the MOSFET? | |
| Jul 10, 2019 at 21:53 | comment | added | TimWescott | To what value did you raise R6? R4 and R5 are sized to deliver about 450mV to the \$V_+\$ terminal of the amp; R6 should be sized so that at maximum design current its voltage is about the same. Then you should check for oscillation -- usually when I do a circuit like this my op-amp to gate resistance is about 1k-ohm, and (for an LM358) I'll have about a 470pF cap from the amp output to it's \$V_-\$ terminal for compensation. | |
| Jul 10, 2019 at 21:43 | comment | added | sstobbe | Is the circuit oscillating? | |
| Jul 10, 2019 at 21:37 | answer | added | Voltage Spike♦ | timeline score: 2 | |
| Jul 10, 2019 at 21:19 | history | asked | Benjamin | CC BY-SA 4.0 |