U2405B
| Model | U2405B |
| Description | Fast Charge Controller for Drained NiCd/NiMH Batteries |
| PDF file | Total 17 pages (File size: 313K) |
| Chip Manufacturer | TEMIC |
U2405B
Status Control
Status control inside and outside the charging process are designated by LED
1
and LED
2
outputs given in the table
below:
LED1 (red)
OFF
OFF
ON
Blinking
ON
OFF
LED2 (green)
ON
Blinking
OFF
OFF
Blinking
OFF
Status
Top-off charge, trickle charge
Quick charge
Temperature out of the window
Drained battery (0.1 V < V
Batt
> 1.6 V, if t > 10 min.)
Battery break, short circuit
Temperature out of window before battery insertion or power on
No battery (V
Batt
> 5 V)
The blink frequency of LED outputs can be calculated as
follows:
f
(LED)
frequency,
+
Oscillator 1024
f
osc
Oscillator
Time sequences regarding measured values and
evaluation are determined by the system oscillator. All
the technical data given in the description are with the
standard frequency 800 Hz.
It is possibe to alter the frequency range in a certain
limitation. Figure 9 shows the frequency versus
resistance curves with different capacitance values.
10000
Oscillation Frequency Adjustment
Recommendations:
0.5C charge
1C charge
2C charge
3C charge
2
3
500 Hz =
500 Hz =
0.5
500 Hz =
250 Hz
500 Hz
1000 Hz
1500 Hz
C
O
=2.2nF
1000
R
O
( k
W
)
C
O
=10nF
100
C
O
=4.7nF
10
0.1
95 11408
1
f
O
( kHz )
10
Figure 9. Frequency versus resistance for different capacitance values
TELEFUNKEN Semiconductors
Rev. A2, 14-Nov-96
11 (17)
