Hello Hitesh,
The LM5101A datasheet has good guidance on bootstrap capacitor sizing in Section 9.2.2.
First determine Qtotal based on MOSFET and driver quiescent current and switching frequency.
Q total = Qgmax + Ihbs(Dmax/Fsw = 81nC + 1uA(Dmax/50kHz…
Hi Ryan,
Thanks for sharing the waveforms.
I noticed that there is bandwidth limit on all of the waveforms. It is generally a good idea to take waveforms without bandwidth limit and with single ended probe.
Differential probes do not have much of…
Hello Jerry,
I am an application engineer supporting the UCC27211 and will work to help resolve your concerns.
I reviewed the datasheet of the IRFL4315 looking at the gate charge, and the 1st comment I have is to review the HS to HB capacitance.
The…
Hello Tim,
I am an applications engineer with the high power drivers product line in TI and will work to answer your questions. If you are not using the floating high side driver in the application, it is recommended to terminate the driver pins in…
Other Parts Discussed in Thread: TMS320F28335 , LM5101A , LM5113 , CSD87352Q5D , TPS28225 Hello,
I am designing a digitally controlled Synchronous Buck Converter. I have chosen CSD87352Q5D (NexFET Power Block) as the main and synchronous MOSFET. TMS320F28335…
Hello Vishaal,
Thank you for the interest in the UCC27211 gate drivers and LM5107. I support the high power gate drivers and can address the UCC27211 related questions.
With the large capacitance on the HB to HS pins the internal boot diode may not…
Hello Sean Do,
For the questions 1 above regarding the gate resistor and parallel diode. This is a recommendation I make as good practice on a new design to accommodate the ability to optimize the performance of the converter. The gate resistor, and…
Hello Tanvi,
Thank you for the interest in the LM5100, LM5101 family and SM74104. The LM5100, LM5101, LM5101A drivers have two independent inputs for the low side and high side drivers, the LO and HO outputs are controlled by the LI and HI inputs which…
Hello Eggsy,
For a 48V input converter most designers do use 100V-120V Half Bridge drivers such as the UCC27211A, UCC27201A, and LM5101A to drive both the high side and low side Mosfets.
I can make recommendations for the separate drivers as you request…
Hi Johny,
Thanks for your interest in our driver, my name is Mamadou DIallo, I will help answer your question.
LM5101 is a device that is not recommended for new designs, therefore we do not have simulations models available for this device.
However…
