ON NCP4300ADR2 Dual operational amplifier and voltage reference Datasheet

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.
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MARKING
DIAGRAM
8
SO−8
D SUFFIX
CASE 751
8
1
N4300
ALYWX
1
Features
A
L
Y
W
X
Operational Amplifier
•
•
•
•
•
•
Low Input Offset Voltage: 0.5 mV
Input Common Mode Voltage Range Includes Ground
Low Supply Current: 210 µA/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
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Option Code = A
PIN CONNECTIONS
Voltage Reference
• Fixed Output Voltage Reference: 2.60 V
• High Precision Over Temperature: 1.0%
• Wide Sink Current Range: 80 µA to 80 mA
Out 1 1
8
VCC
In 1− 2
7
Out 2
In 1+ 3
6
In 2−
GND 4
5
In 2+
Typical Applications
• Battery Charger
• Switch Mode Power Supply
(Top View)
ORDERING INFORMATION
Device
1
−
Output 1
VCC
7
Output 2
6
2.6 V
4
Package
Shipping†
SO−8
2500/Tape & Reel
†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.
−
+
3
GND
NCP4300ADR2
+
2
Inputs 1
8
Inputs 2
5
Figure 1. Functional Block Diagram
 Semiconductor Components Industries, LLC, 2003
December, 2003 − Rev. 2
1
Publication Order Number:
NCP4300A/D
NCP4300A
ABSOLUTE MAXIMUM RATINGS
Symbol
Value
Unit
Supply Voltage (VCC to GND)
Rating
VCC
36
V
ESD Protection Voltage at any Pin (Human Body Model)
VESD
2.0 K (min)
V
Op−Amp 1 and 2 Input Voltage Range (Pins 2, 5, 6)
VIR
−0.6 to VCC +0.6
V
Op−Amp 2 Input Differential Voltage Range (Pins 5, 6)
VIDR
VCC to GND
V
IK
100
mA
Voltage Reference Cathode Current (Pin 3)
Maximum Junction Temperature
TJ
150
°C
Operating Ambient Temperature Range
TA
0 to 105
°C
Storage Temperature Range
Tstg
−55 to 150
°C
Symbol
Value
Unit
Thermal Resistance, Junction to Ambient
RJA
155
°C/W
Thermal Resistance, Junction to Case
RJC
45
°C/W
THERMAL CHARACTERISTICS
Rating
TYPICAL ELECTRICAL CHARACTERISTICS
Characteristic
Total Supply Current, excluding Current in the Voltage Reference
VCC = 5.0 V, no load; 0°C TA 105°C
Symbol
Min
Typ
Max
Unit
ICC
−
0.42
0.8
mA
−
−
0.5
−
2.0
3.0
−
7.0
−
−
−
−50
−
−150
−150
50
25
100
−
−
−
Op−Amp 1 (Op−amp with non−inverting input connected to the internal Vref)
(VCC = 5.0 V, Vout = 1.4 V, TA = 25°C, unless otherwise noted)
Input Offset Voltage
TA = 25°C
TA = 0°C to 105°C
VIO
VIO/T
Input Offset Voltage Temperature Coefficient
TA = 0°C to 105°C
Input Bias Current (Inverting input only)
TA = 25°C
TA = 0°C to 105°C
mV
IIB
µV/°C
nA
Large Signal Voltage Gain (VCC = 15 V, RL = 2.0 kΩ, Vout = 1.4 V to 11.4 V)
TA = 25°C
TA = 0°C to 105°C
AVOL
Power Supply Rejection (VCC = 5.0 V to 30 V)
PSRR
40
90
−
dB
Output Source Current (VCC = 15 V, Vout = 2.0 V, VID = +1.0 V)
IO+
10
16
−
mA
Output Sink Current (VCC = 15 V, Vout = 2.0 V, VID = −1.0 V)
IO−
10
25
−
mA
Output Voltage Swing, High (VCC = 30 V, RL = 10 kΩ, VID = +1.0 V)
TA = 25°C
TA = 0°C to 105°C
VOH
27
27
28
−
−
−
Output Voltage Swing, Low (RL = 10 kΩ, VID = −1.0 V)
TA = 25°C
TA = 0°C to 105°C
VOL
−
−
17
−
100
100
Slew Rate (Vin = 0.5 to 2.0 V, VCC = 15 V, RL = 2.0 kΩ, Av = 1.0, CL = 100 pF)
SR
0.3
0.5
−
V/µs
Unity Gain Bandwidth (VCC = 30 V, RL = 2.0 kΩ, CL = 100 pF, Vin = 0.5 Vpp @
f = 70 kHz)
BW
0.3
0.7
−
MHz
Total Harmonic Distortion (f = 1.0 kHz, AV = 10, RL = 2.0 kΩ, VCC = 30 V,
Vout = 2.0 VPP)
THD
−
0.02
−
%
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2
V/mV
V
mV
NCP4300A
TYPICAL ELECTRICAL CHARACTERISTICS (continued)
Characteristic
Symbol
Min
Typ
Max
−
−
0.5
−
2.0
3.0
−
7.0
−
−
−
2.0
−
30
30
−
−
−50
−
−150
−150
−
0 to
VCC −1.5
−
50
25
100
−
−
−
40
90
−
40
30
60
−
−
−
Unit
Op−Amp 2 (Independent op−amp) (VCC = 5.0 V, Vout = 1.4 V, TA = 25°C, unless otherwise noted)
Input Offset Voltage
TA = 25°C
TA = 0°C to 105°C
VIO
VIO/T
Input Offset Voltage Temperature Coefficient
TA = 0°C to 105°C
Input Offset Current
TA = 25°C
TA = 0°C to 105°C
IIO
Input Bias Current
TA = 25°C
TA = 0°C to 105°C
IIB
Input Common Mode Voltage Range (VCC = 0 V to 35 V)
VICR
Large Signal Voltage Gain (VCC = 15 V, RL = 2.0 kΩ, Vout = 1.4 V to 11.4 V)
TA = 25°C
TA = 0°C to 105°C
AVOL
Power Supply Rejection (VCC = 5.0 V to 30 V)
PSRR
Common Mode Rejection (VCM = 0 V to 3.5 V)
TA = 25°C
TA = 0°C to 105°C
CMRR
mV
µV/°C
nA
nA
V
V/mV
dB
dB
Output Source Current (VCC = 15 V, Vout = 2.0 V, VID = +1.0 V)
IO+
10
16
−
mA
Output Sink Current (VCC = 15 V, Vout = 2.0 V, VID = −1.0 V)
IO−
10
25
−
mA
Output Voltage Swing, High (VCC = 30 V, RL = 10 kΩ, VID = +1.0 V)
TA = 25°C
TA = 0°C to 105°C
VOH
27
27
28
−
−
−
Output Voltage Swing, Low (RL = 10 kΩ, VID = −1.0 V)
TA = 25°C
TA = 0°C to 105°C
VOL
−
−
17
−
100
100
Slew Rate (Vin = 0.5 to 3.0 V, VCC = 15 V, RL = 2.0 kΩ, Av = 1.0, CL = 100 pF)
SR
0.3
0.5
−
V/µs
Unity Gain Bandwidth (VCC = 30 V, RL = 2.0 kΩ, CL = 100 pF, Vin = 0.5 Vpp @
f = 70 kHz)
BW
0.3
0.7
−
MHz
Total Harmonic Distortion (f = 1.0 KHz, AV = 10, RL = 2.0 kΩ, VCC = 30 V,
Vout = 2.0 VPP)
THD
−
0.02
−
%
−
2.574
2.60
2.60
−
2.626
V
mV
Voltage Reference
Reference Voltage (IK = 10 mA)
TA = 25°C
TA = 0°C to 105°C
Vref
V
Reference Input Voltage Deviation Over Full Temperature Range
(IK = 10 mA, TA = 0°C to 105°C)
Vref
−
5.0
22
mV
Minimum Cathode Current for Regulation
IK(min)
−
55
80
µA
Dynamic Impedance
TA = 25°C, IK = 1.0 to 80 mA, f 1.0 KHz
TA = 0°C to 125°C, IK = 1.0 mA to 60 mA, f 1.0 KHz
|ZKA|
−
−
0.3
−
0.5
0.6
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3
Ω
TA = 25°C
60
Vref, REFERENCE VOLTAGE (V)
IK, CATHODE CURRENT (mA)
NCP4300A
40
20
0
−20
−1.0
0
1.0
2.620
2.610
2.600
2.590
2.580
3.0
2.0
20
0
80
100
TA, AMBIENT TEMPERATURE (°C)
Figure 2. Reference Cathode Current
vs. Cathode Voltage
Figure 3. Reference Voltage
vs. Ambient Temperature
10
IK, CATHODE CURRENT (mA)
IK = 1.0 mA to 60 mA
0.35
0.3
0.25
0.2
0
50
TA = 25°C
8.0
Stable
6.0
Unstable
4.0
Stable
2.0
0
100 pF
100
1.0 F
1000 pF
10 F
100 F
CL, LOAD CAPACITANCE
TA, AMBIENT TEMPERATURE (°C)
Figure 5. Reference Stability
vs. Load Capacitance
Figure 4. Reference Dynamic Impedance
vs. Ambient Temperature
0
1.0
VCC = 5.0 V
IIB, INPUT BIAS CURRENT (nA)
VO, INPUT OFFSET VOLTAGE (mV)
60
40
VKA, CATHODE VOLTAGE (V)
0.4
|ZKA|, DYNAMIC IMPEDANCE (Ω)
IK = 10 mA
Op−Amp 2
0.5
0
Op−Amp 1
−0.5
VCC = 5.0 V
−5.0
−10
−15
Op−Amp 2
Op−Amp 1
−20
−25
−1.0
0
20
40
60
80
0
100
20
40
60
80
TA, AMBIENT TEMPERATURE (°C)
TA, AMBIENT TEMPERATURE (°C)
Figure 6. Input Offset Voltage
vs. Ambient Temperature
Figure 7. Input Bias Current
vs. Ambient Temperature
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100
CMRR, COMMON MODE REJECTION RATIO (dB)
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
reference is initially trimmed to a ±0.5% tolerance at
TA = 25C and is guaranteed to be within ±1.0% over an
ambient temperature range of 0C to 105C.
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.
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.
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.
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.
Internal Reference
An internal precision band gap reference is used to set the
2.6 V voltage threshold and current threshold setting. The
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5
NCP4300A
Opto
Isolator
8
6
−
AC
Line
7
SMPS
5
Iout
+
+
Battery
Pack
R1
2.6 V
+
Vout
−
1
2
−
3
4
R3
R2
R4
R5
Current
Sense
The above circuit demonstrates the use of the NCP4300A in a constant−current constant−voltage switch mode battery charger application. The charging current level is set by resistors R3, R4, and R5. The reference voltage is divided down by resistors 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 constant−current 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 constant−voltage
mode. The formulas for programming the output current and voltage are given below.
Iout Vref
R3 1 R5
R4
Vout R1 1 Vref
R2
With : R3 30 k
R4 1.2 k
R5 0.1
Iout 1.0 A
With : R1 4.7 k
R2 3.6 k
Vout 6.0 V
Figure 9. Constant−Current Constant−Voltage Switch Mode Battery Charger
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NCP4300A
PACKAGE DIMENSIONS
SO−8
D SUFFIX
CASE 751−07
ISSUE AA
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSION A AND B DO NOT INCLUDE MOLD
PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER
SIDE.
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL IN
EXCESS OF THE D DIMENSION AT MAXIMUM
MATERIAL CONDITION.
6. 751−01 THRU 751−06 ARE OBSOLETE. NEW
STANDARD IS 751−07.
−X−
A
8
5
0.25 (0.010)
S
B
1
M
Y
M
4
K
−Y−
G
C
N
X 45 SEATING
PLANE
−Z−
0.10 (0.004)
H
M
D
0.25 (0.010)
M
Z Y
S
X
S
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7
J
DIM
A
B
C
D
G
H
J
K
M
N
S
MILLIMETERS
MIN
MAX
4.80
5.00
3.80
4.00
1.35
1.75
0.33
0.51
1.27 BSC
0.10
0.25
0.19
0.25
0.40
1.27
0
8
0.25
0.50
5.80
6.20
INCHES
MIN
MAX
0.189
0.197
0.150
0.157
0.053
0.069
0.013
0.020
0.050 BSC
0.004
0.010
0.007
0.010
0.016
0.050
0
8
0.010
0.020
0.228
0.244
NCP4300A
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should
Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,
and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal
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For additional information, please contact your
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NCP4300A/D