OK, I'm going to ask a stupid question here....
Both those units, the 5v mini usb and the TP5100 ... they both have full LED's. So... do they not stop charging?
Or is the issue that once they've fully charged, they drop down a little and start charging again, and cycle like that?
Or that they are being charged too fast?
These are dedicated intelligent charger, constant current and constant voltage mode.
Please see attached datasheet, please self-translate it.
For the TP5100, need to set to single cells and you can alter the charging current. Read it.
TP5100 is designed for double section 8.4V / single section 4.2V
Lithium-ion battery design and switching of large current charger
Chip, the use of power transistors inside the chip into the battery
Line Trickle, constant current and constant voltage charge. Charge current can be used
External resistor programming, the maximum sustained charge current up
2A, do not need additional anti-reflux diode. TP5100 included
Two open-drain output status indication output, charging
Status indicator CHRG and battery full status indication input
STDBY out. The chip's internal power management circuitry is at
Chip junction temperature exceeds 145 ? automatically reduce the charge
Flow, this feature allows users to maximize the use of the core
Chip power handling capabilities, do not have to worry about the chip overheating and loss
Bad chip or external components.
When the input voltage is greater than the chip start-up threshold voltage and
The chip enable input is tied high (VREG) or left floating
When the TP5100 starts charging the battery, the CHRG pin
Output low, indicating that charging is in progress. If double section
Lithium-ion battery voltage is lower than 5.8V (single-cell lithium battery
Lower than 2.9V), the battery charger with a small current
Trickle precharge (precharge current through external resistor can be
Tune). Constant current charging current from VS pin and VBAT tube
The resistance between the feet is fixed. When the double lithium-ion battery voltage
Close to 8.4V (single lithium-ion battery close to 4.2V)
The charge cut-off voltage is about 50mV (depending on the electricity
Road connection resistance and battery resistance voltage is different), charging electricity
Flow is gradually reduced, TP5100 into constant voltage charging mode. when
Charging current reduced to cut-off current, the charge cycle junction
Bunch, CHRG end output high impedance state, STDBY end lose
Low out.
When the battery voltage drops to the recharge threshold (two lithium-ion
Sub-battery 8.1V / single lithium-ion battery 4.05V), since
Start a new charging cycle. High-precision chip internal
Voltage reference, error amplifier and resistor divider network indeed
Battery-side cut-off voltage accuracy of + -1% or less, to meet
Lithium-ion battery charging requirements. When the input voltage is powered down
Or the input voltage is lower than the battery voltage, the charger goes low
Power down mode, without external anti-back-diode,
Battery leakage from the chip close to 1uA.
The choice of cut-off voltage. When CS is connected to high potential
VREG, 8.4V dual-cell lithium-ion battery charging standard
Quasi, cut-off voltage 8.4V. When CS end vacant, as a single
Lithium-ion battery battery charging standard, cut-off voltage 4.2V.
When CS is tied low GND, the charger stops
Charge.
TP5100's CS-side composite design, you can pass
The external control determines that the TP5100 is in charge mode and downtime
Mode switch.
When the CS side vacant, said TP5100 for a single lithium from
Sub-battery charge.
8.4V dual lithium-ion battery charging status and downtime
Mode switch. Shown in Figure 4, through an open drain input
The output port is connected with the CS terminal if the gate of the NMOS transistor is input
Low, N1 end, this time CS termination high
Charge cut-off voltage of 8.4V, TP5100 for the two-cell lithium from
Sub-battery charge. When the NMOS transistor gate input high,
N1 turns on, at this moment CS end is pulled down to GND, TP5100
For the stop mode. VREG pin can output 5mA drive power
Flow, pull-up resistor optional 1k-100k.