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Application Note 1049
this power supply is available, the charger takes about 200
TIME (1m s/div)
V IN (2V/div)
V2P8 (2V/div)
STATUS (5V/div)
FAULT (5V/div)
FIGURE 2. V2P8, STATUS, FAULT WAVEFORMS DURING POR
LED Indications
A green LED (D1) and a red LED (D2) are used to indicate
the charger status. When it is charging, the green LED lights
up. When a fault occurs, the red LED turns on. Refer to the
datasheet for more information.
Evaluation
Various evaluation of the ISL6291 can be carried out with
this evaluation board. The following evaluations demonstrate
typical behaviors of the power-on reset, a complete charge
and recharge cycle, the TIMEOUT accuracy examination,
and the charge current thermal foldback feature.
Power-On Reset
Figure 2 shows how the charger response to the power-on.
As the input voltage rises to the POR threshold, the V2P8
pin starts to output a 2.8V supply. This pin can usually be
used as an input power presence indication. The 2.8V also
supplies power to the internal control and logic circuit. After
TIME (1ks/div)
ms to reset all internal logic and for the control circuit to
stabilize. During this 200 ms, the FAULT pin outputs a logic
LOW, and the STATUS pin stays HIGH. Once the power-on
reset is finished, the charger starts a new charge cycle. The
STATUS pin outputs a LOW signal and the FAULT pin jumps
to HIGH since there is no fault situation.
A Complete Charge and Recharge Cycle
Figure 3 shows a complete charge cycle and a recharge
cycle. The battery being charged was completely
discharged, to the extent that the internal over-discharge
protection circuit was triggered, before the charge began. At
t1, the charger is powered. The charger quickly goes
through the trickle mode and the charge current rises to a 1A
set constant current. At t2, the battery voltage rises to 4.2V
and the charge current starts to fall. The charge cycle
finishes at t3 when the charge current falls to the end-of-
charge current set by the IMIN pin. The battery voltage
maintains at 4.2V during t2 and t3. At t4, a 500mA current is
applied to the battery, and the battery starts to drop. As the
battery voltage drops to 4.0V in the middle of t4 and t5, the
charger starts to re-charge the battery. At t5, the 500mA load
is removed, and this portion of the current is removed from
the charger, causing a step drop of the charge current. At the
end of Figure 3, the charge current once again reaches the
end-of-charge current and stops charging.
TIME Pin Waveform
The waveform on the TIME pin can give an accurate
TIMEOUT calculation. Figure 4 shows the TIME pin
waveform. The TIME-pin waveform is a triangular waveform.
The amplitude is 1V with a 0.5V valley and 1.5V peak
voltage. When a 15pF timing capacitor is used, the typical
oscillation period is 3ms and the typical TIMEOUT period is
3.5 hours with the internal 22-stage binary counter.
Fully
Discharged
Battery
Pack
Apply
5V Input
Charge Current
(200mA/div)
V BAT (1V/div)
t 1
t 2
t 3
t 4
t 5
500mA Load Current
FIGURE 3. A COMPLETE CHARGE AND RECHARGE CYCLE
2
AN1049.1
May 5, 2009
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