参数资料
| 型号： | NCP4300ADR2 |
| 厂商： | ON Semiconductor |
| 文件页数： | 6/7页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP/VOLT REF DUAL 8SOIC |
| 产品变化通告： | Product Obsolescence 11/Feb/2009 |
| 标准包装： | 2,500 |
| 放大器类型： | 通用 |
| 电路数： | 2 |
| 转换速率： | 0.5 V/µs |
| 增益带宽积： | 700kHz |
| 电流 - 输入偏压： | 50nA |
| 电压 - 输入偏移： | 500µV |
| 电流 - 电源： | 420µA |
| 电流 - 输出 / 通道： | 25mA |
| 电压 - 电源，单路/双路(±)： | 3 V ~ 35 V |
| 工作温度： | 0°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 带卷 (TR) |
| 其它名称： | NCP4300ADR2OS |
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP4300ADR2G | 功能描述:运算放大器 - 运放 2.6V Ref. Dual Op AMP RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| NCP4302 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Secondary Side Synchronous Flyback Controller |
| NCP4302ADR2G | 功能描述:初级与次级侧 PWM 控制器 SYNCHRONOUS RECTFICTION CONTRLLR RoHS:否 制造商:ON Semiconductor 输出端数量:1 开关频率:250 KHz 工作电源电压:- 0.3 V to + 28 V 最大工作温度:+ 85 C 最小工作温度:- 5 C 封装 / 箱体:SOIC-8 Narrow 封装:Reel |
| NCP4302ADR2G | 制造商:ON Semiconductor 功能描述:Off-Line Controller IC |
| NCP4302BDR2G | 功能描述:初级与次级侧 PWM 控制器 SYNCHRONOUS RECTFICTION CONTRLLR RoHS:否 制造商:ON Semiconductor 输出端数量:1 开关频率:250 KHz 工作电源电压:- 0.3 V to + 28 V 最大工作温度:+ 85 C 最小工作温度:- 5 C 封装 / 箱体:SOIC-8 Narrow 封装:Reel |
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