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NCP4300A Fiches technique(PDF) 6 Page - ON Semiconductor

No de pièce NCP4300A
Description  Dual Operational Amplifier and Voltage Reference
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Fabricant  ONSEMI [ON Semiconductor]
Site Internet  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP4300A Fiches technique(HTML) 6 Page - ON Semiconductor

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NCP4300A
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The above circuit demonstrates the use of the NCP4300A in a constant−current constant−voltage switch mode battery char-
ger application. The charging current level is set by resistors R3, R4, and R5. The reference voltage is divided down by resis-
tors R3 and R4 to create an offset voltage at pin 6. This results in a high state at the op amp output, pin 7. As the battery pack
charge current increases, a proportional increasing voltage is developed across R5 that will eventually cancel out the pin 6
offset voltage. This will cause the op amp output to sink current from the opto isolator diode, and control the SMPS block
in a constant−current mode. Resistors R1 and R2 divide the battery pack voltage down to the 2.6 V reference level. As the
battery pack voltage exceeds the desired programmed level, the voltage at pin 2 will become slightly greater than pin 3. This
will cause the op amp output to sink current from the opto isolator diode, and control the SMPS block in a constant−voltage
mode. The formulas for programming the output current and voltage are given below.
Figure 9. Constant−Current Constant−Voltage Switch Mode Battery Charger
Iout +
Vref
R3
R4
) 1 R5
With : R3
+ 30 k
R4
+ 1.2 k
R5
+ 0.1
Iout + 1.0 A
Vout +
R1
R2
) 1 Vref
With : R1
+ 4.7 k
R2
+ 3.6 k
Vout + 6.0 V
+
+
12
3
4
76
5
8
2.6 V
AC
Line
SMPS
Opto
Isolator
R4
R5
Current
Sense
R3
R2
R1
Vout
Iout
Battery
Pack
+


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