Sign up using Email and Password. I noticed that when charging a capacitive load, the current trough M1 is oscillating with the frequency of the charge pump. Retrieved from ” https: Drawback is that capacitor will discharge by leakage currents, so ot need to switch off and on load time-to-time. I’ve used the LTC for a similar function in the past, but it won’t handle 30V.
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It cannot produce higher or lower voltages than its power and ground supply levels. You can’t go too overboard with capacitance, you definitely need a good e. A PLL charge pump is merely a bipolar switched current source.
Look for example at MAX, it is very similar to that you need. Still, Maxim ICs charge pump gate rather expensive. By putting the pujp string at the load side, I reference the charge-pump to the source. charge pump gate
Just choose what exactly fits your pukp. If you want charge pump gate solution, there are lots of ICs named ‘high side n-MOS driver’ all over the world. Please help to improve this article by introducing more precise citations.
Still, I will investigate the circuits you posted. How can I avoid it? Post as a guest Name. Please help me understand how a gate driver is usually build, or point me to a suitable integrated circuit. In industry-made gate charge pump gate push-pull cascade is used, providing gats fast switching thus reducing switching power dissipation and reduce quiescent current through pump.
If charge pump gate holding the voltage high for a long period of time multiple secondsthen a boost is necessary. It has a logic-level control input and provides surge current limiting and overcurrent protection.
If higher gate voltage required more cascades can be added. My first question back to you is “Are you really sure you need a boost to your bootstrap capacitor?
Charge pump – Wikipedia
This article includes charge pump gate list of referencesbut its sources remain unclear because it has insufficient inline citations. Drawback is that capacitor will discharge by leakage currents, so ot need to switch off and on load time-to-time. One solution is to use Villard cascade voltage multiplier.
Arne 2 11 I can increase the rise-time by increasing C1 or lowering R2-R4. Is there an easy way to mitigate this? I think that will result charge pump gate very slow switching: Maybe it would be hard to find find a chip fits exactly charge pump gate your needs voltage, consumption etc. Questions Tags Users Badges Unanswered. Applying the equivalent resistor concept to calculating the power losses in the charge pumps.
The easy way to “just handle” this problem is to get an isolated DC-DC converter to provide a dedicated high-side source, though that is also the most expensive option.
The class of ICs called “hot-swap controllers” are generally quite useful for power management. An external or secondary circuit drives the switching, typically at tens of kilo hertz up to several megahertz.
The pulsing nature of the higher voltage switched output is often smoothed by the use of an output capacitor. Another charge pump gate solution I thought charge pump gate is to disconnect C1 from M1’s source, and relying on the charge pump alone to supply the voltage.