| ??? 07/16/05 08:31 Modified: 07/16/05 08:34 Read: times |
#97475 - Reducing parts count with many MOSFETs Responding to: ???'s previous message |
Given your input, I just found the SN74AS757N octal buffer/line driver also having the open-collector output and a slightly greater sink current.
http://focus.ti.com/lit/ds/sdas040b/sdas040b.pdf If everything I was driving was on-board, I would use logic level MOSFETs and use low-side switching, but... I need simplified connection to off-board power oriented components. This board will be part of a work tool where my fellow workers would greatly benefit from a more "traditional" low voltage interface. The high-side switching requires half the wire or cable. P-channel MOSFETs might still be an option, unfortunately I'm not yet aware of maximum current draw, maybe 12 amps each line. P-channels have a higher on-state resistance than a typical N-channel. High-side switching: positive terminal ---> fuse ---> board ---> wire to external light ---> external light ---> ground instead of: Low-side switching: positive terminal ---> fuse(s) ---> wire to external light ---> external light ---> RETURN WIRE TO BOARD ---> board ---> ground Dan |
| Topic | Author | Date |
| Parts count when driving many MOSFETs | 01/01/70 00:00 | |
| Logic Level MOSFET? | 01/01/70 00:00 | |
| Reducing parts count with many MOSFETs | 01/01/70 00:00 | |
| Much more information needed | 01/01/70 00:00 | |
| Reducing parts count | 01/01/70 00:00 | |
| Automotive drivers | 01/01/70 00:00 | |
| Mosfet driver | 01/01/70 00:00 | |
| I drive optoisolators directly from port | 01/01/70 00:00 | |
| digital optos | 01/01/70 00:00 | |
| parts count | 01/01/70 00:00 | |
Simply | 01/01/70 00:00 |