| ??? 06/11/11 17:11 Read: times |
#182603 - Circuit Behavior Responding to: ???'s previous message |
This circuit has an interesting behavior. It starts out, when battery is installed normally, by conducting through the body diode. As soon as the battery voltage level gets to the threshold of the FET via the gate to source resistor divider the FET turns on and shorts across the body diode. This prevents normal usage loss due to the drop across the body diode.
For reversed battery you just have to ensure that the Vds rating of the FET can handle a negative 6 volts or so without damage. Michael Karas |
| Topic | Author | Date |
| battery polarity reversal -protection | 01/01/70 00:00 | |
| Better Specifications Needed | 01/01/70 00:00 | |
| parts | 01/01/70 00:00 | |
| Circuit Behavior | 01/01/70 00:00 | |
| Parasitic diode | 01/01/70 00:00 | |
| diode is ok | 01/01/70 00:00 | |
| Why is diode OK? | 01/01/70 00:00 | |
| battery is shown in normal connection | 01/01/70 00:00 | |
| I use a similar circuit | 01/01/70 00:00 | |
| Threshold Note | 01/01/70 00:00 | |
| Gate divider | 01/01/70 00:00 | |
| Another thing to consider... | 01/01/70 00:00 | |
Gate network | 01/01/70 00:00 |