Hi Obinna,
There are no Spice models for those devices. The battery chargers have extremely complicated state machines with some proprietary algorithms. Developing a Spice model would be very costly and it would not support all functionality.
Regards…
Part Number: BQ24125 Hi
I have a question associated with BQ24125. It is based on direct connection topology, In such a system, the maximum power delivered from the external input supply to the system power bus is limited by the charger settings.
…
Hi Jeff,
I took another board and did some measurement more carefully. What I found were:
1) The voltage across sense resistor is 0.1 V, this indicates 1.5 A flow through the resistor 2) very little current (<10 mA) flow into the battery. 3) Voltage…
Part Number: BQ24125 Hello,
The calculations for Riset2 (equation 18 on page 24 of bq24125 datasheet) state that:
Kiset2 = 1000 (confirmed in datasheet)
Rsns = from my schematic, e.g. 0.5 ohms in my case
Icharge = the fast charge current correct…
Part Number: BQ24125 Dear TI community could you please review the schematic.
actually this is quite the same as reference design of bq24125EVM-003
I_charger = 0.23 A
U_charger = 12.6 V
Thanks a lot.
regards,
Mike
Part Number: BQ24125 Hi,
We are using BQ24125 to charge 3 cell Li-ion battery & facing issue in battery charging. Required charging current is 1 Amp, Pre-charge current 0.1Amp.
Input voltage is 15V. Battery current state voltage is 10.8V.
We are…
Lin,
1. The RC Snubber depends on the switching waveform. You can read more about it here: e2e.ti.com/.../calculate-an-r-c-snubber-in-seven-steps
2. The bq24125 does not use the bootstrap circuit, I was just talking in general terms for all chargers…
Part Number: BQ24125 In the case we use for example 665k + 665k as a feedback divider (for 1 cell) and we plug a 12V battery then the FB pin will see 6V. There is no spec for FB pin in the datasheet. except for input bias current (25nA)
Thanks!
Pablo,
It is interesting that there is no post about these before Nov 2016!
I had the same suspicion when I started calculating the resistors for this charger. Indeed, EQ(18) is wrong - whoever made the datasheet simply copied/pasted the previous set…
