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NCP4300A Datasheet(PDF) 5 Page - ON Semiconductor |
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NCP4300A Datasheet(HTML) 5 Page - ON Semiconductor |
5 / 7 page NCP4300A http://onsemi.com 5 55 50 60 65 Figure 8. Common Mode Rejection Ratio vs. Supply Voltage VCC, SUPPLY VOLTAGE (V) 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 source−load 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 constant−voltage (CV) or constant−current (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 (Op−Amp 1) The internal Op−Amp 1 is designed to perform the voltage control function. The non−inverting input of the op−amp is connected to the precision voltage reference internally. The inverting input of the op−amp 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 Op−Amp 1 (pin 1) provides the error signal for output voltage control. The output pin also provides a means for external compensation. Independent Operational Amplifier (Op−Amp 2) The internal Op−Amp 2 is configurated as a general purpose op−amp with all terminals available for the user. With the low offset voltage provided, 0.5 mV, this op−amp can be used for current sensing in a constant current regulator. |
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Similar Description - NCP4300A_09 |
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