U2402B
| Model | U2402B |
| Description | Fast Charge Controller for NiCd/NiMH Batteries |
| PDF file | Total 17 pages (File size: 318K) |
| Chip Manufacturer | TEMIC |
U2402B
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
LED2 (green)
ON
Blinking
OFF
OFF
Status
No battery, top off charge, trickle charge
Quick charge, temperature out of the window before battery insertion or power on
Temperature out of the window
Battery break (interrupt) or short circuit
f
(LED)
frequency,
+
Oscillator 1024
f
osc
The blink frequency of LED outputs can be calculated as
follows:
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.
Oscillation Frequency Adjustment
Recommendations:
0.5C charge
1C charge
2C charge
3C charge
10000
0.5
500 Hz =
250 Hz
500 Hz
2
3
500 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. A3, 14-Nov-96
11 (17)
