| ??? 03/04/09 07:57 Modified: 03/04/09 08:00 Read: times |
#163052 - What is the tolerence of your 3v3? Responding to: ???'s previous message |
The major question is can the 3v3 device tolerate the Vdd variance caused voltage drop variance across each diode.
There are several factors for voltage drop values across diodes, namely current through the diodes, and temperature. Say, for example, If the allowable Vdd swing is between 3v3-10% and 3v3+10% does the diode volt dropper system stay within these limits across the entire operating temperature range and load characteristic (current draw). If the 3v3 device load is not constant current - then the voltage across each device will vary with load current. If the 3v3 is mission critical - use a 3v3 regulator. How about a dual regulator? Joe |
| Topic | Author | Date |
| Using 3 diodes to derive 3 volts from 5 volts | 01/01/70 00:00 | |
| OK Consider | 01/01/70 00:00 | |
| Also consider temperature | 01/01/70 00:00 | |
| re:3.3 | 01/01/70 00:00 | |
| LM 317 | 01/01/70 00:00 | |
| What is the tolerence of your 3v3? | 01/01/70 00:00 | |
| use a LDO from 5 to 3V3 | 01/01/70 00:00 | |
| Ditto, suggestions | 01/01/70 00:00 | |
I agree | 01/01/70 00:00 |