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Results tagged with power-supply
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user 16497
An electronic device that supplies electrical energy to a load. It can be AC or DC input. Typically DC output.
6
votes
PMOS Inrush Current Limit - Where to place Capacitor
It is usually beneficial to use feedback around an active device, like C4 would provide to M1, when you can. That lets the gain of the amplifier work for you. Let's see how it works out by comparing t …
- 7,273
6
votes
Accepted
What to do about very hot planar inductor?
The problem is that the cores being used have no gap, so the inductor saturates. A topology with Flyback type operation stores energy in the core when the switch is on, moving the core up the BH curve …
- 7,273
1
vote
Power supply overshooting during power up and power down
That there is no output start-up spike with the preregulator in place will be because the soft-start of the LM5118 adds tens of milliseconds to the time allowed for the bias to come up and actively co …
- 7,273
1
vote
MC34063 Current Mode
Make R1 a pull-down. Instead of connecting Q1-c to M1 and Q1-e to ground, connect Q1-c to Vin and Q1-e to M1-gate with R1 pull-down to ground. Make R1 ~ 30 \$\Omega\$ (maybe 100mA will be enough to tu …
- 7,273
2
votes
Accepted
Smoothing current drawn by PWM load
You're talking about two separate issues, the EMI and inrush currents. EMI filtering won't help much with inrush current.
As far as inrush, it looks like you need to slow the charging of that honk …
- 7,273
6
votes
Accepted
How to properly switch between two power sources with a MOSFET?
As Madmanguruman pointed out, the main problem is that if the host board is connected, current will flow through the body diode of the p channel FET into the 3V3_2 output. Knowing nothing of the 12V …
- 7,273
5
votes
Accepted
Pass device selection for bench DC power supply
From fuzzy memory, there are (at least) two grades of 2N3055. There's poor and then really poor. The poor version has higher \$H_{\text{fe}}\$ and \$f_T\$ than the really poor ones. You probably won't …
- 7,273
0
votes
Dual rail switching PSU critique
"What, if anything, am I missing?"
The main thing would be that you are using non-isolated boost regulators. With a non-isolated boost, the minimum output voltage will be Vin-Vd or in this case ~11.6V …
- 7,273
4
votes
Accepted
BJT Puzzler: Common Emitter or Emitter Follower?
I wasn't going to answer this question, since I had already been through it with an earlier question from the OP (scanny). But, it's turned into such a mess, can't help it. I mean, 1 right answer out …
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0
votes
Regulated +5V drops when relays are switched on
The biggest things for load regulation are distribution loss (conductive or copper loss), and specified load regulation. In this case the output is dropping about 2% over your test load range. This is …
- 7,273
2
votes
Accepted
Why sample current via lopsided resistive divider?
The divider of R34 and R27 appears to allow the current limit point to be a function of \$V_{\text{out}}\$. At low \$V_{\text{out}}\$ U4B will perceive closer to the full \$I_o\$. As \$V_{\text{out}}\ …
- 7,273