参数资料
| 型号： | NCP4300AD |
| 厂商： | ON Semiconductor |
| 文件页数： | 5/7页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP/VOLTAGE REF DUAL 8-SOIC |
| 产品变化通告： | LTB Notification 03/Jan/2008 |
| 标准包装： | 98 |
| 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： | 管件 |
NCP4300A
http://onsemi.com
5
55
50
60
65
Figure 8. Common Mode Rejection Ratio
vs. Supply Voltage
VCC, SUPPLY VOLTAGE (V)
CMRR,
COMMON
MODE
REJECTION
RA
TIO
(dB)
030
20
10
40
VCC = 3.0 V to 35 V
105°C
25°C
0°C
DETAILED OPERATING DESCRIPTION
INTRODUCTION
Power supplies and battery chargers require precise
control of output voltage and current in order to prevent
catastrophic damage to the system connected. Many present
day power sources contain a wide assortment of building
blocks and glue devices to perform the required sensing for
proper regulation. Typical feedback loop circuits may
consist of a voltage and current amplifier, summing circuitry
and a reference. The NCP4300A contains all of these basic
functions in a manner that is easily adaptable to many of the
various power sourceload configurations.
OPERATING DESCRIPTION
The NCP4300A is an analog regulation control circuit that
is designed to simultaneously close the voltage and current
feedback loops in power supply and battery charger
applications. This device can control the feedback loop in
either constantvoltage (CV) or constantcurrent (CC)
mode with smooth crossover. A concise description of the
integrated circuit blocks is given in below. The functional
block diagram of the IC is shown in Figure 1.
Internal Reference
An internal precision band gap reference is used to set the
2.6 V voltage threshold and current threshold setting. The
reference is initially trimmed to a
±0.5% tolerance at
TA = 25_C and is guaranteed to be within ±1.0% over an
ambient temperature range of 0
_C to 105_C.
Voltage Sensing Operational Amplifier (OpAmp 1)
The internal OpAmp 1 is designed to perform the voltage
control function. The noninverting input of the opamp is
connected to the precision voltage reference internally. The
inverting input of the opamp monitors the voltage
information derived from the system output. As the control
threshold is internally connected to the voltage reference,
the voltage regulation threshold is fixed at 2.6 V. For any
output voltage from 2.6 V up to the maximum limit can be
configurated with an external resistor divider. The output
terminal of OpAmp 1 (pin 1) provides the error signal for
output voltage control. The output pin also provides a means
for external compensation.
Independent Operational Amplifier (OpAmp 2)
The internal OpAmp 2 is configurated as a general
purpose opamp with all terminals available for the user.
With the low offset voltage provided, 0.5 mV, this opamp
can be used for current sensing in a constant current
regulator.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP4300ADG | 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 |
| NCP4300ADR2 | 功能描述:运算放大器 - 运放 2.6V Ref. 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 |
| 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 |
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