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bq24650
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  • Forum Post: Using bq24650 as system supply

    David Petticord
    I am designing a system that intermittently draws around two amps from a 3.3v LiFePo4 battery. The system has a solar panel attached in order to charge the battery. The solar panel may or may not have sufficient power to power the system. For other BQ241xx Battery Charger ICs , TI indicates...
    on Sep 12, 2010

  • Forum Post: Re: BQ24650 - question regarding MPPT

    Michael Day
    The bq24650 can accept an input voltage up to 28V. The resistor divider R17 & R19 are used to set the MINIMUM voltage on the input to the charger. With a highly resistive input source or a solar cell, pulling more current from the source makes the source voltage drop. If the source voltage drops...
    on Dec 17, 2010

  • Forum Post: Re: Bq24650

    Michael Day
    I would like to suggest that you use the bq24650 EVM for your design. The typical application circuit in the datasheet provides the basic functionality. The EVM design includes additional components for noice reduction and circuit protection that you are likely to need in your actual design. If not needed...
    on Feb 10, 2011

  • Forum Post: Bq24650

    Cebrail Haluk Gorgulu
    Hello dear desingers. i wonder that does anybody use Typical System Schematic in the datasheet of bq24650. I'm planing to create a circuit which contain this circuit too . I can hear that ti already made it. But i want to hear from customers. Have a good day.
    on Feb 10, 2011

  • Forum Post: bq24650 - Lead Acid Equalization Charge

    Michael Day
    Is there a way for the bq24650 to achieve the " equalization charge" as specified in IEA Task III report in §7.1 To summarize, this charging state is used to equalize the capacity of each individual cell inside a multicell battery. It is implemented by increasing the voltage per cell to...
    on Mar 11, 2011

  • Forum Post: Re: bq24650 - Lead Acid Equalization Charge

    Michael Day
    The bq24650 allows the use of an equalization charge mode. The bq24650 uses an external resistor divider to set the charge voltage, which gives the user flexibility to charge batteries with different maximum charge voltages. Equalization charge mode is easily implemented by switching in a resistor in...
    on Mar 11, 2011

  • Forum Post: bq24650 - Poor line regulation

    Michael Day
    I'm using the bq24650 EVM to charge a 7.2V sealed lead acid battery. I've noticed the charge current increases over 10% as I increase the input voltage from 15V to 25V. Why is the charge current not constant with changing input voltage?
    on Apr 3, 2011

  • Forum Post: Re: Solar to SuperCap Charger

    Pete Goudreau
    It's possible to use the bq24650 and bypass the precharge problem with supercaps by the addition of a resistor between the 3.3V output and the VFB input. The resistors in the feedback divider along with this added resistor allow the VFB pin to be at ~1.6V at startup with discharged supercaps...
    on May 21, 2011

  • Forum Post: GPRS module powered by Li-Ion battery, charged by solar panel: bq2403x or bq24650?

    Christian Obkircher
    Hello, I need to power a GPRS module which accepts an input voltage from 3.4 up to 4.8 V - it is mainly designed to be powered from a Li-Ion battery. My solar panel delivers 330 mA at 6 V. My first approach was to follow the slua394 App Note. The problem is, MPP Tracking won't work if...
    on Jun 10, 2011

  • Forum Post: SLUA586 - Spreadsheet Tool request

    Santiago Gutierrez
    Hi, SLUA586 talks about a “Spreadsheet Tool” for calculating the thermistors and resistors to allow the BQ24650 to track Vmp over temperature. Can I get a copy of the Spreadsheet Tool?
    on Jul 11, 2011

  • Forum Post: Re: BQ24650 in Solar Battery Charger at >28V

    Tahar Allag
    Please take a look at the draft app note. This may help you select you charger. -Tahar (Please visit the site to view this file)
    on Aug 24, 2011

  • Forum Post: Re: BQ24650 Spreadsheet error

    Michael Day
    I read the numbers in your picture as 20, 0.529, 0.631, -0.002, 100, 4456, 20, 80, 5 and entered them into the spreadsheet. The spreadsheet recommends Rp=9.18k, Rs=305k, Rb=40k. I am using Microsoft Office Excel 2003. What version are you using? Texas Instruments provides a bq24650 Evaluation...
    on Oct 18, 2011

  • Forum Post: BQ24650 Spreadsheet error

    Ahmed Belgana69308
    Hy I need to calculate resistance for BQ24650 resistor, i also want to know if TI can do test for me. Thank's.
    on Oct 18, 2011

  • Forum Post: Bq24650 Power Path??

    Jordan Gamble
    Does the Bq24650 have Power Path functionality integrated or do I need to add an external circuit. And if I do need to add one, is there an app note on it? -Jordan
    on Nov 30, 2011

  • Forum Post: Bq24650 EVM

    Agatha Oliveira97187
    Hello, If I purchase the EVM for the BQ24650, will I be able to use this part regularly with my solar cell and charge my battery? I don't have experience making PCB layouts and the packaging of the part is too small, so I was hoping that by buying the EVM, I could overcome this problem. ...
    on Feb 28, 2012

  • Forum Post: Re: BQ24650 STAT1 Pin Usage

    Michael Day
    The bq24650 datasheet shows the STAT1 and STAT2 pins to be open collector. You can connect them to any voltage of your choice as long as you don't violate the pins' the abs max specs in the datasheet. Your uP supply voltage would be a good choice. TI's gas gauge ICs are designed to monitor...
    on Apr 9, 2012

  • Forum Post: BQ24650 STAT1 Pin Usage

    Jeramie Bianchi
    Hi, I want to interface the bq24650 STAT1 output to a PIC32 microcontroller: The microcontroller does not support anything above a 3.3V level. What is the recommended method of performing this? I was thinking of removing the LED (from the reference schematic) and instead connecting STAT1 directly...
    on Apr 9, 2012

  • Forum Post: BQ24650 Iwake, Ifault, and other operation questions

    Dan Huslig
    I have a few questions stemming BQ24650 specification review and eval board observation. 1. Per the spec, Iwake is 125mA nominal when a 10mOhm sense resistor is used. I presume if a 100mOhm sense resistor is used then Iwake decreases to 12.5mA. Please confirm that Iwake servos such that (SRP...
    on Apr 10, 2012

  • Forum Post: BQ24650 EVM Max Charge Current

    Keith Walls
    On page 3 of the EVM user guide, Table 3 states that the max charge current recommended is 8A. I was wondering if this is due to the copper thickness and trace width of the PCB or if it is due to other components besides R6 and L1. According to the BOM on page 10 of the same document, the FET's are...
    on Apr 4, 2012

  • Forum Post: RE: 10A SLA Charger Based on BQ24650

    john xiao
    Hi Rik: I have designed the 10A Mppt controller unit(six serials LiFePO4) with BQ24650 . The unit's efficiency is over 91%. and all charging functions are great. But I found some questions.For example, The BQ24650 operation circuit is 10mA with the 2A charging current, but the BQ24650 operation...
    on Jul 5, 2012

  • Forum Post: BQ24650 charging at half rated current

    TIM FOSTER
    I have designed a prototype board using the BQ24650 to charge an SLA battery using the SLUSA75 datasheet and basing the design on the SLVA437A Application note. I used the circuit in the App note, except that I removed D1 and D3 and eliminated the connection between the upper node of D3 to C2 (We don't...
    on May 17, 2012

  • Forum Post: PV solar to NiMH charger bq24650

    steve maietta
    Hello I am designing a circuit to charge a large (4Ah) NiMH battery from a small solar array. We have three 6v (at best) solar panels each put out around 100ma. The battery is a 10 cell, 4-5000mAh NiMh pack. The pack will power a small radio designed to remain outdoors, running very intermittently, I...
    on Nov 7, 2012

  • Forum Post: MPPT for TEG application

    Matt Aloisio
    Question relating to MPPT application of the BQ25504 and BQ24650 I have a thermoelectric module with an open circuit voltage of 8.8V and MPP of 4.3V. I am looking for an MPPT device that will be used to charge a 6V rechargeable lead acid battery. Reading over the datasheets of the above mentioned devices...
    on Jan 31, 2013

  • Forum Post: BQ24650 INPUT SOURCES

    naga raja
    Is it possible to charge the Battery charger BQ24650 with an external 5V power supply or is it compatible only with solar charger?
    on Feb 1, 2013

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