U2402B 데이터 시트보기 (PDF) - Temic Semiconductors

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U2402B

Fast Charge Controller for NiCd/NiMH Batteries

Temic Semiconductors 

U2402B

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, Tmax, during the

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 LED1. A charge

sequence will start only when the specified window

temperature range is attained. In such a case, the green

LED2 starts blinking immediately showing a quasi charge

readiness, even though there is no charge current flow.

The temperature window is specified between two

voltage transitions. The upper voltage transition is

specified by the internal reference voltage of 4 V, and the

lower voltage transition is represented by the external

voltage divider resistances RT2 and RT3.

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, RT1,

RT2 and RT3 are calculated as follows:

W suppose RT2 = 100 k , then

+ RT1

RNTCmax

VRef – 4V

4V

+ RT3

RNTCmin

RT2

RT1

If NTC sensors are not used, then select the circuit

configuration according to figure 10.

VRef

RT1

NTC

sensor

VRef

14

RT2

Tmax

7

RT3

7V

Sensor

8

7V

+

–

VRef = 4 V

+

–

Figure 7. Temperature window

High

temperature

Low

temperature

94 8682

TELEFUNKEN Semiconductors

Rev. A3, 14-Nov-96

9 (17)

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