u2402b ETC-unknow, u2402b Datasheet - Page 9

• Manufacturer Part Number: u2402b
• Description: Fast Charge Controller Nicd/nimh Batteries
• Manufacturer: ETC-unknow

TELEFUNKEN Semiconductors
Rev. A3, 14-Nov-96
Temperature Control, Figure 7
When the battery temperature is not inside the specified
temperature windows, the overal temperature control will
not allow the charge process. Sensor short circuit or
interruption also leads to switch-off.
Differentiation is made whether the battery exceeds the
maximum allowable temperature, T
charge phase or the battery temperature is outside the
temperature window range before battery connection.
A permanent switch-off follows after a measurement
period of 20.48 s, if the temperature exceeds a specified
level, which is denoted by a status of a red LED
sequence will start only when the specified window
temperature range is attained. In such a case, the green
LED
readiness, even though there is no charge current flow.
The temperature window is specified between two
voltage transitions. The upper voltage transition is
2
starts blinking immediately showing a quasi charge
V
sensor
NTC
Ref
R
T1
R
R
T2
max
T3
Sensor
, during the
Figure 7. Temperature window
T
V
1
max
Ref
14
. A charge
7
8
7 V
7 V
specified by the internal reference voltage of 4 V, and the
lower voltage transition is represented by the external
voltage divider resistances R
NTC sensors are normally used to control the temperature
of the battery pack. If the resistance values of NTC are
known for maximum and minimum conditions of
allowable temperature, then other resistance values, R
R
suppose R
If NTC sensors are not used, then select the circuit
configuration according to figure 10.
T2
V
and R
Ref
R
R
T1
T3
+
+
= 4 V
–
–
T3
T2
+
+
are calculated as follows:
= 100 k
R
R
NTCmax
NTCmin
W
, then
R
R
V
temperature
temperature
T2
T1
Ref
High
Low
4V
– 4V
T2
94 8682
and R
U2402B
T3
.
9 (17)
T1
,