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PDF NCS1002A Data sheet ( Hoja de datos )
| Número de pieza | NCS1002A | |
| Descripción | Constant Voltage / Constant Current Secondary-Side Controller | |
| Fabricantes | ON Semiconductor | |
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NCS1002A
Constant Voltage / Constant
Current SecondarySide
Controller
Description
The NCS1002A is a performance upgrade from the NCS1002
focused on reducing power consumption in applications that require
more efficient operation. It is a highly integrated solution for
Switching Mode Power Supply (SMPS) applications requiring a dual
control loop to perform Constant Voltage (CV) and Constant Current
(CC) regulation. The NCS1002A integrates a 2.5 V voltage reference
and two precision op amps. The voltage reference, along with Op Amp
1, is the core of the voltage control-loop. Op Amp 2 is an independent,
uncommitted amplifier specifically designed for the current control.
Key external components needed to complete the two control loops
are: (a) A resistor divider that senses the output of the power supply
(battery charger) and fixes the voltage regulation set point at the
specified value. (b) A sense resistor that feeds the current sensing
circuit with a voltage proportional to the DC output current. This
resistor determines the current regulation set point and must be
adequately rated in terms of power dissipation. The NCS1002A comes
in a small 8−pin SOIC package and is ideal for space-shrunk
applications such as battery chargers.
Features
• Low Input Offset Voltage: 0.5 mV, Typ
• Input Common-Mode Range includes Ground
• Low Quiescent Current: 75 mA per Op Amp at VCC = 5 V
• Large Output Voltage Swing
• Wide Power Supply Range: 3 V to 36 V
• High ESD Protection: 2 kV
• This is a Pb−Free Device
Typical Applications
• Battery Chargers
• Switch Mode Power Supplies
http://onsemi.com
MARKING
DIAGRAMS
8
SOIC−8
1002A
8
D SUFFIX
ALYWG
CASE 751
11
G
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
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)
Output 1 1
-+
8 VCC
2 7 Output 2
Inputs 1
3
2.5V
+-
6
Inputs 2
GND 4
5
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 8 of this data sheet.
© Semiconductor Components Industries, LLC, 2014
June, 2014 − Rev. 5
1
Publication Order Number:
NCS1002A/D
1 page  
NCS1002A
1.4
1.2
1.0
0.8
0.6
0.4 OP1
0.2
0
−50 −30 −10 10 30 50 70 90 110 130
TEMPERATURE (°C)
Figure 1. Input Offset Voltage vs. Temperature
5
4
3
2
1
0
−40 −20 0
20 40 60 80 100 120
TEMPERATURE (°C)
Figure 2. IB vs. Temperature
2.6
2.58
2.56
2.54
2.52
2.5
2.48
2.46
2.44
2.42
2.4
0
10 20 30 40 50 60 70 80 90
CATHODE CURRENT IK (mA)
Figure 3. Vref as a Function of IK
100
2.52
2.51
2.5
2.49
2.48
−40
−20 0 20 40 60 80
TEMPERATURE (°C)
Figure 4. Vref Over Temperature
100
0.5
0.45
0.4
0.35
0.3
0.25
0.2
−40 −30 −20 −10 0 10 20 30 40 50 60 70 80 90 100
TEMPERATURE (°C)
Figure 5. Ref Dynamic Impedance vs.
Temperature
http://onsemi.com
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet NCS1002A.PDF ] | |
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