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PDF NCP4300ADR2 Data sheet ( Hoja de datos )
| Número de pieza | NCP4300ADR2 | |
| Descripción | Dual Operational Amplifier and Voltage Reference | |
| Fabricantes | ON | |
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NCP4300A
Dual Operational Amplifier
and Voltage Reference
The NCP4300A is a monolithic integrated circuit specifically
designed to control the output current and voltage levels of switch
mode battery chargers and power supplies. This device contains a
precision 2.6 V shunt reference and two operational amplifiers.
Op−Amp 1 is designed to perform voltage control and has its
non−inverting input internally connected to the reference. Op−Amp 2
is designed for current control and has both inputs uncommitted. The
NCP4300A offers the power converter designer a control solution that
features increased precision with a corresponding reduction in system
complexity and cost. This device is available in an 8−lead surface
mount package.
Features
• This is a Pb−Free Device
Operational Amplifier
• Low Input Offset Voltage: 0.5 mV
• Input Common Mode Voltage Range Includes Ground
• Low Supply Current: 210 mA/Op−Amp (@VCC = 5.0 V)
• Medium Unity Gain Bandwidth: 0.7 MHz
• Large Output Voltage Swing: 0 V to VCC − 1.5 V
• Wide Power Supply Voltage Range: 3.0 V to 35 V
Voltage Reference
• Fixed Output Voltage Reference: 2.60 V
• High Precision Over Temperature: 1.0%
• Wide Sink Current Range: 80 mA to 80 mA
Typical Applications
• Battery Charger
• Switch Mode Power Supply
Output 1
Inputs 1
1
+
2
3
2.6 V
GND 4
+
8 VCC
7 Output 2
6
Inputs 2
5
8
1
http://onsemi.com
MARKING
DIAGRAM
SOIC−8
D SUFFIX
CASE 751
8
N4300
ALYWA
G
1
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
A = Option Code
G = Pb−Free Package
PIN CONNECTIONS
Out 1 1
In 1− 2
In 1+ 3
GND 4
8 VCC
7 Out 2
6 In 2−
5 In 2+
(Top View)
ORDERING INFORMATION
Device
NCP4300ADG
Package
SOIC−8
(Pb−Free)
Shipping†
98 Units / Rail
NCP4300ADR2G SOIC−8 2500/Tape & Reel
(Pb−Free)
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
Figure 1. Functional Block Diagram
© Semiconductor Components Industries, LLC, 2009
August, 2009 − Rev. 4
1
Publication Order Number:
NCP4300A/D
1 page  
NCP4300A
65
VCC = 3.0 V to 35 V
60
105°C
55
25°C
0°C
50
0 10 20 30 40
VCC, SUPPLY VOLTAGE (V)
Figure 8. Common Mode Rejection Ratio
vs. Supply Voltage
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.
http://onsemi.com
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