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AN2390 датащи(PDF) 31 Page - STMicroelectronics

номер детали AN2390
подробное описание детали  A flexible universal battery charger
PDF  42 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2390 датащи(HTML) 31 Page - STMicroelectronics

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AN2390
How to use the evaluation board
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The total time was around 99 minutes in which the constant current phase remained for
around 30 minutes. Figure 20 shows the graph of the output current versus time.
Figure 20.
Output Current vs. Time
The variation in the output current was around +/- 10mA and the variation in output voltage
was +/- 20 mV.
3.3.3
NiMH battery charger
The following parameter values are used for the NiMH charger.
The following values are programmed for the different phases:
1) Pre-charging Phase:
Here Vbat <= 1.0 V and charging current: 0.1 C = 200 mA
Charging time taken by the battery: 10 minutes (approximately)
2) Constant Current Phase:
Charging Current = 1 A and Programmed charging time = 2 Hr
Output Current (mA) Vs Time (Minutes)
0
200
400
600
800
1000
1200
Tim e (Minutes)
Table 8.
Table 8: NiMH battery charger parameters
SL No
Parameter name
Value
Input Parameter
1
Input Supply Voltage
5 V
2
Max Input Supply Current
2 A
Output Parameter
3
Max Battery Output Voltage
1.7 V / cell
4
Output Current
1000 mA



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