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Comments by Claire
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New Product: 5V, 5A Step-Down Voltage Regulator D24V50F5
- 11 March 2022Hi, Patrick.
We saw your email and responded to it. Hope that helps your issue!
-Claire
New products: DRV8256E/P motor driver carriers
- 15 November 2021Hi
We do not recommend paralleling the outputs of two of our DRV8256E carriers. The datasheet for the chip does not mention any special considerations for it, so there is no guarantee the timing of the two drivers will line up well enough to prevent shoot-through or other issues. Depending on your application, one of our larger drivers like the TB67H420FTG or VNH5019 might be more appropriate.
-Claire
New products: D36V50Fx Step-Down Voltage Regulators
- 26 July 2021Hi, Fed.
Most power sources have some fluctuation on their outputs, so generally we do not recommend using a 48V source with these regulators with 50V maximum input voltages.
-Claire
New Product: 5V, 5A Step-Down Voltage Regulator D24V50F5
- 13 July 2021Hi, Joseph.
It is possible to slightly adjust the output of the D24V50F5 regulator. Please email us for more details.
-Claire
New products: Shunt Regulators
- 6 July 2021Hi.
The shunt resistances are already optimized for the power level and voltage of the available models. You can see in the simplified schematic that the resistors set the maximum current that the shunt regulator will draw for a given voltage, and that's just an Ohm's Law V=IR case. So if you make them too big for a given expected voltage, the regulator might not be able to draw enough current to keep the voltage from spiking. On the flip side, making the resistors too small is a power dissipation issue, where that power is V^2/R. So you have to make sure that for the resistance and voltage you expect, you will not exceed the power the resistors can dissipate.
-Claire
New Product: 5V, 5A Step-Down Voltage Regulator D24V50F5
- 16 June 2021Hi, Timothy.
The D24V50F5 regulator has short-circuit protection, and a supercap looks like a short, so the regulator will just keep trying to restart out of short circuit protection. I tested one on a pair of 150F, 2.7V caps in series, and the regulator did eventually charge them to 5V in about six minutes, for an average output current of about 1A. One thing to be aware of is that once the caps charged enough so that the short-circuit cycle stops triggering, the current jumped pretty drastically before ramping down.
So, overall, it's possible but not recommended since you would be better off with a regulator that doesn't have the short-circuit protection and can continuously deliver its intended current into your supercaps.
-Claire
New product: 24V Step-Up/Step-Down Voltage Regulator S18V20F24
- 14 April 2021Hi, Pieter.
The S18V20F24 regulator could help filter ripple out of a rectified output, depending on how much ripple there is. Note that even with a very steady input, switching regulators have some amount of variation on their outputs. If you need a very clean output, boosting to a slightly higher voltage and then using a linear regulator might be better.
-Claire
New versions of our 500mA D24V5Fx step-down voltage regulators
- 23 March 2021Hi, Matt.
One of the reasons electrolytic capacitors help prevent LC voltage spikes is their relatively high ESR (equivalent series resistance), so a low impedance cap is probably not great. It might just be a marketing term that doesn't mean that much. Adding a small (e.g. 1 ohm) resistor in series should work, as it can for other low ESR capacitors such as ceramics. Our application note about Understanding Destructive LC Voltage Spikes has more information.
-Claire
New D24V150Fx 15A step-down voltage regulator family — our highest-power regulators yet!
- 19 February 2021Hi, Rob.
We have not characterized these regulators with heatsinks, but you could try adding one to see how much improvement you would get. It would probably be most effective on the silkscreen side of the board above the two large FETs. We have also generally found that forced airflow is more effective than a heatsink alone and one of my previous posts has a link to a 3D printable enclosure that fits a fan. Note that for most input and output voltage combinations 8A should not be an issue without additional cooling.
-Claire
New adjustable voltage regulators with multi-turn fine adjustment
- 22 January 2021Hi, kolaCZek.
We would not recommend this for your application since we have many strictly step-down regulators that have a higher maximum input voltage, which would give you more margin on the high side. However, if your 12V source is actually clean and sure to stay under the 16V maximum input of the S9V11F5S6CMA regulator, you'll probably be fine. You might want to put an electrolytic cap on the input to prevent or limit any LC spikes on power-up that could go over 16V.
-Claire