參數(shù)資料
型號: NCP4300ADR2G
廠商: ON Semiconductor
文件頁數(shù): 6/7頁
文件大?。?/td> 0K
描述: IC OPAMP/VOLT REF DUAL 8SOIC
標(biāo)準(zhǔn)包裝: 2,500
放大器類型: 通用
電路數(shù): 2
轉(zhuǎn)換速率: 0.5 V/µs
增益帶寬積: 700kHz
電流 - 輸入偏壓: 50nA
電壓 - 輸入偏移: 500µV
電流 - 電源: 420µA
電流 - 輸出 / 通道: 25mA
電壓 - 電源,單路/雙路(±): 3 V ~ 35 V
工作溫度: 0°C ~ 105°C
安裝類型: 表面貼裝
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 8-SOICN
包裝: 帶卷 (TR)
其它名稱: NCP4300ADR2GOS
NCP4300A
http://onsemi.com
6
The above circuit demonstrates the use of the NCP4300A in a constantcurrent constantvoltage 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 resist-
ors 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 constantcurrent 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 constantvoltage
mode. The formulas for programming the output current and voltage are given below.
Figure 9. ConstantCurrent ConstantVoltage 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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