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Hi,
No, the ring happens before the high side sync MOSFET turns on.
I'm using the shortest ground wire (the spring ground wire). I don't have a thermal camera, so I don't know the thermal dissipation. but I think I can measure the power efficiency later.
When i remove the 1.5nF capacitor on...
Hi,
I have an issue with the BOOST circuit. with the MOSFET of NVMFS5C670NL, there is no ring on the VDS (Low side MOSFET T53201 and T53202)). But when I change to NVMFS5C646NLAFT1G, the ring on VDS is observed. I also could observe the ring on Vgs.
Could you let me know why it happened? How to...
I measured the V-I characteristic curve of parasitic diode on MOSFET, seems the slope isn't steep like a diode.
I just use a power supply to power the diode, increase the voltage of power supply, and measure the drop voltage and current flow the diode, then i get the V-I curve.
here is my...
The converter is ISL78227, here is the datasheet.
https://www.intersil.com/content/dam/Intersil/documents/isl7/isl78227.pdf
The forward current of ABS6 is too low. I tried to increase the caps to 820uF, but there is no improvement.
thanks for your reply.
I will double check the ground to make the current return loop as short as possible.
that is not 1.2MHz, actually, it is 1.152MHz, it is not the 3rd harmonic of 400KHz, it is the harmonic of classD amplifier. we have fixed it.
Hi everyone,
I have a conducted emission voltage failure at the switching frequency of BOOST circuit.
below circuit is the power rail filter, and the UBATT was connected to the BOOST input. the switching frequency of BOOST is 400KHz, it has two phase and delayed 180 degree, so i get the failure...
Hi All,
I have a question about the layout of Crystal, do i need to add more GND vias on the yellow round mark to GND layer? or keep one via on the left side to GND layer? which one is better?
Thank you so much.
Hi,
I have a basic question while reading the datasheet of MCU.
the BALL RESET STATE means that the status of the ball while reset. the BALL RESET REL. STATE means that the status of the ball after release reset, right?
and what's the meaning of drive 0 (OFF), what's the difference between PD...
For a Hardware Engineer, while we use a chip based on ARM or MIPS platform, is there some technical knowledge we should know? And is there some point we should pay more attention between this two different architecture?
Thank you very much.
Hi Everyone,
Please refer to the attached pic, I add a Zener diode D27 on the +VBATT trace to protect the ICs after it, I just want to know is it OK?
The +VBATT was provided by a external power supply, if the +VBATT is higher than the break voltage of the Zener diode, the diode will clamp the...
HI ,
you mean that if I divide a capacitor into several different value of capacitors, it would cause some problem? such as a 330uF capacitor, divide into 220uF+100uF+10uF, it would create ringing effect or distortion. right?
could you explain more detailed about the ringing and distortion? If...
Hi Everyone,
I have a quesion about parellel-capacitor, if I need 2200uF on the trace, what if I place 10 pcs of 220uF cap instead of one 2200uF?
You know, every cap has ESL and ESR, if I place 10 pcs of cap parelleled instead of one 2200uF cap, the ESL and ESR should get much smaller, and it...
Hi Everyone,
I am design a OVP and OCP circuit, and the input voltage is 3.7V~4.2V, max current is 3A.
Here are some requirements:
1. The total impedance of the trace should be less than 0.1ohm.
2. OVP threshold is 6V and OCP threshold is 3A.
3. the OVP and OCP circuit can not draw current from...
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