Hi Henry,
Regarding using lm25085 that feeds from a 12v battery, in the data sheet p#24, its reccommended to add a bulk capacitor parallel& priore Cin if distance is more than a few inches. Can you please check and advice if a 100uf is enough? if not…
Hi Matt,
Please check your values using the LM251085 quickstart calculator: https://www.ti.com/tool/LM25085-5085QUICK-CALC . The injected ripple to FB should be in the 50-100mV range.
If you suspect noise affecting the circuit, please send the PCB layout…
Part Number: LM25085 Dear members,
we have used LM25085 to control a FAN by changing the duty cycle. I want that this circuit limits the current at 4A. Input voltage will be 0 to 12V according to duty cycle.
Rsense= 0.030 ohm. Having 30mOhm I observed…
Part Number: LM25085 Other Parts Discussed in Thread: LM3102 , LM25011 , LM3100 Hi, I have an urgent issue about the LM25085:
Circuit Description: LM25085, as the first-stage Buck chip, is connected to the supercapacitor through the MOS driven by the LM74701…
Part Number: LM25085
Hi, we make a buck controller topology in which USB PD input. This means input voltages are 5V, 9V, 15V, and 20V. The maximum current is 5A. We want, if the input voltage is 5V, İnput voltage will directly pass to the output. In…
Part Number: LM25085
HEllo,
I'm designing a dynamic Li-ion charger. The user will set the precharging current, the cuttoff voltage, the CC current, the CV threshold and the CV voltage depending on the bateery specs.
for that reason, i have added…
Part Number: LM25085 Hello TI team!
Here are the application details:
Vin= 12.0 - 14.4V
Vout= 12.4V
Load= 5A
Fsw= 300kHz
4 layer PCB (Signal 1, GND, PWR, Signal 2)
We have noticed that when our LM25085 regulator is switching, the digital circuits on…
Hi,
I haven't heard back from you for some time so I'll assume this issue has been resolved on customer end.
If there is an update, please reply back to this thread and I will continue with support.
Thank you for using the E2E forum.
Regards, …
Part Number: LM25085 Hello TI team :)
Here are my application details:
Vin= 13.8V
Vout= 12.4V
Load= 5A
Inductor= 4.7uH
RT= 249kOhm
Rsns= 10mOhm
Radj= 2kOhm
PFET delay delta= 12ns
I wanted to check for current runaway using equation 13 in the datasheet…
Part Number: LM25085 Hi expert,
Customer find that when output current increase from 0 to 400mA, the output voltage increases nearly 1V. Could you please give some suggestions? Thanks.
Please find waveforms and schematic. LM25085芯片电压跳变问题doc.doc
Regards…