NCS1002 Datasheet, PDF (1/9 Pages) ON Semiconductor – Constant Voltage / Constant Current SecondarySide Controller

NCS1002
Constant Voltage / Constant
Current Secondary­Side
Controller
Description
The NCS1002 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 NCS1002 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 NCS1002 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: 300 mA per Op Amp at V_CC = 5 V
• Large Output Voltage Swing
• Wide Power Supply Range: 3 V to 32 V
• High ESD Protection: 2 kV
• These are Pb−Free Devices
Typical Applications
• Battery Chargers
• Switch Mode Power Supplies
http://onsemi.com
MARKING
DIAGRAMS
8
SOIC−8
1002
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)
© Semiconductor Components Industries, LLC, 2009
July, 2009 − Rev. 1
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 8 of this data sheet.
1
Publication Order Number:
NCS1002/D