Other Parts Discussed in Thread: BQ2002T I have a BQ2002T battery charger management IC with the TM pin biased at Vcc/2. The thermistor has been replaced by a 10 K resistor to determine if the timer actually ends the charge cycle. It does not. I have…
Now I'm charging at 1C in fast charging mode because I connected the TM pin to GND, but I'm still missing something. In the BQ2002T datasheet at page 4, when it is described the starting of charge cycle, the point 2 says "Voltage at the BAT pin falling…
Other Parts Discussed in Thread: BQ2002T I am using BQ2002T board http://www.ti.com/lit/ug/sluu007b/sluu007b.pdf using 6 cells. Depending on the batteries the charger can sometime get stuck in this loop:
Vbat <2 volts then full charge
Vbat>2 volts…
I have a circuit just like http://www.ti.com/lit/ug/sluu007b/sluu007b.pdf using 4 cells. Pin voltages are DC as follows:
1=2.5V, 2=0V, 3=2.1V, 4=0V, 5=1.61V, 6=5V, 7=0V, 8=4.3V
Can anyone think of a reason why the CC pin 8 is in high impedance when…
Other Parts Discussed in Thread: BQ2002T The Data sheet for the BQ2002T states that if the Voltage at Vts is greater than Vtco then fast charge will occur as long as Vbat is less than 2V per cell. And conversely, if Vts is less than Vtco, then fast charge…
Other Parts Discussed in Thread: BQ2002T , BQ2002 I've been developing a charger for a pack of NiMH batteries using the BQ2002T and a switching constant current boost converter. The charge current is 600mA (~C/4 for 2300mAH AA Batteries).
I'm having…
Other Parts Discussed in Thread: BQ2002T , LM317 Hi There,
I'm using the BQ2002T for a battery circuit, and I have no problems making it work and figuring our how to make it charge the batteries. The one problem I do have is in figuring out how to connect…
Other Parts Discussed in Thread: BQ2002T , LM317 I have 6 BQ2002T's idependently charging 6 9V NiMH's. Sometimes the CC pin will go from Fast chage (Steady VCC) to some randomly pulsating state and either stay in that state, or some time later going to…
Either IC will work fine. The bq2000T is a switching charger while the bq2002 is a linear charger. It just depends on whether you want a simpler design (bq2002) with more power dissipation in the main transistor (less efficiency). This would also depend…
Other Parts Discussed in Thread: BQ2002T , LM317 , BQ2002 bq2002T Fast Charge Management IC: Fast charge times out & goes to the top-off mode in less than one minute (about 55 seconds). If I momentarily disconnect and reconnect the charger input it charges…
