NCS1002A Datasheet, PDF (1/9 Pages) ON Semiconductor – Constant Voltage / Constant Current SecondarySide Controller

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 V_CC = 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
1
1
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 V_CC
7 Out 2
6 In 2−
5 In 2+
(Top View)
Output 1 ¹
-+
8 V_CC
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
1
June, 2014 − Rev. 5
Publication Order Number:
NCS1002A/D