Part Number: LM27222 Other Parts Discussed in Thread: UCC27282
What guilde lines should I follow to select the bootstrap capacitor for a LM27222 driving 2 N-Channel FETS switching a 18 AMP load at 30HZ? This is to use the LM27222 as a replacement for…
Hello Gaurav,
It is good to hear the LM27222 with the floating bias is working in your application.
Regarding the multiple LM27222 circuits and the shared bias. The floating high side bias needs to be referenced to the CB and SW pins of each respective…
Other Parts Discussed in Thread: LM27222 The data sheet for the LM27222 is not clear on what to do with LEN pin. It shows it going the the PWM "controller". Can I just tie this to +5V? That is how I have it now and it kinda works, but the MOSFETS…
Hi Yuval,
Sorry about the delayed response. This post slipped through the crack. The peak sourcing and sinking current of each LM27222 drivers(HG and LG) is 3Aand 4.5A respectively. So I don't see a problem driving a 500mA current directly from the…
Can I drive the LEN and the IN inputs from microcontroller?
Are the any restriction in driving the inputs?
Is there any illegal state with the inputs?
INJECT and L_EN are enable & PWM inputs.
U6 & 7 are level shifters.
U2 seems to be burnt depends…
Hi Slavko,
I appreciate your willingness to look at a TI design solution. Using the cross-reference tool on TI.com: http://www.ti.com/sitesearch/docs/universalsearch.tsp?searchTerm=ncp1396#linkId=8 , the UCC25600 might be a good replacement for the NCP1396…
Josh,
Take a look at the datasheets LM5104, TPS28226, and LM27222. These drivers offer adaptive dead time. It is not the same technology as discussed above for the Predictive Gate Drive, but they may meet your needs.
I hope this helps.
- Daniel
Other Parts Discussed in Thread: LM27222 Looking for an 'equivalent' device to the FAN7380, but does not have to be a drop-in replacement. It DOES need to operate at 20V. I'm thinking the LM510x-series might be suitable, or the LM27222. Do…
Other Parts Discussed in Thread: LM27222 Hi, I wonder if it's possible to design some of available buck (or othrer) regulators to work as simple fixed rato dc voltage step down transformer?
Thanks.
Hi Don Dapkus. Thanks for answer. I think I will use this schematic as example e2e.ti.com/.../Visio_2D00_LM27222.pdf .
Can you please advice for how high current should I calculate the floating supply ? I calculated that boost peak current is about 5A…