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參數(shù)資料
| 型號(hào)： | NCP4300ADR2G |
| 廠商： | ON Semiconductor |
| 文件頁(yè)數(shù)： | 5/7頁(yè) |
| 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
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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