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
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MARKING
DIAGRAMS
8
8
1
A
L
Y
W
G
SOIC−8
D SUFFIX
CASE 751
1
1002
ALYWG
G
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
Out 1
In 1−
In 1+
GND
1
2
3
4
(Top View)
8 V
CC
7 Out 2
6 In 2−
5 In 2+
•
•
•
•
•
•
•
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
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 8 of this data sheet.
©
Semiconductor Components Industries, LLC, 2012
December, 2012
−
Rev. 2
1
Publication Order Number:
NCS1002/D
NCS1002
MAXIMUM RATINGS
Parameter
Supply Voltage (V
CC
to GND)
Differential Input Voltage
Input Voltage
ESD Protection Voltage at Pin
Maximum Junction Temperature
Specification Temperature Range (T
min
to T
max
)
Operating Free−Air Temperature Range
Storage Temperature Range
Human Body Model
Symbol
V
CC
V
id
V
i
V
ESD
T
J
T
A
T
oper
T
stg
Rating
36
36
−0.3
to +36
2000
150
−40
to +105
−55
to +125
−55
to +150
Unit
V
V
V
V
°C
°C
°C
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
THERMAL CHARACTERISTICS
Parameter
Thermal Resistance
Junction−to−Ambient
Symbol
R
qJA
Rating
175
Unit
°C/W
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2
NCS1002
ELECTRICAL CHARACTERISTICS
Symbol
I
CC
I
CC
Characteristics
Conditions
Min
Typ
0.3
Max
0.4
0.75
Unit
mA
mA
Total Supply Current, excluding current in the Voltage Reference V
CC
= 5 V, no
load;
−40
v
T
A
v
+105°C
Total Supply Current, excluding Current in the Voltage Reference V
CC
= 30 V, no
load;
−40
v
T
A
v
+105°C
OP AMP 1 (OP AMP WITH NONINVERTING INPUT CONNECTED TO THE INTERNAL V
ref
)
(V
CC
= 5 V, T
A
= 25°C unless otherwise noted)
V
IO
DV
IO
l
IB
AVD
PSRR
I
SOURCE
I
O
I
SINK
Input Offset Voltage
T
A
= 25°C
−40
v
T
A
v
+105°C
Input Offset Voltage Drift (−40
v
T
A
v
+105°C)
Input Bias Current (Inverting Input Only) T
A
= 25°C
Large Signal Voltage Gain (V
CC
= 15 V, R
L
= 2 kW,
V
ICM
= 0 V)
Power Supply Rejection (V
CC
= 5.0 V to 30 V, V
OUT
= 2 V)
Output Source Current (V
CC
= 15 V, V
OUT
= 2.0 V,
V
id
= 1 V)
Short Circuit to GND (V
CC
= 15 V)
Output Current Sink (V
id
=
−1
V)
V
CC
= +15 V, V
OUT
= 0.2 V
(Note 1)
V
CC
= +15 V, V
OUT
= 2 V
V
OH
Output Voltage Swing, High (V
CC
= 30 V)
R
L
= 2 kW, T
A
= 25°C
−40
v
T
A
v
+105°C
R
L
= 10 kW, T
A
= 25°C
−40
v
T
A
v
+105°C
V
OL
SR
GBP
THD
Output Voltage Swing, Low
R
L
= 10 kW, T
A
= 25°C
−40
v
T
A
v
+105°C
Slew Rate (AV = +1, V
i
= 0.5 V to 2 V, V
CC
= 15 V,
R
L
= 2 kW, C
L
= 100 pF)
Gain Bandwidth Product (V
CC
= 30 V, AV = +1, (Note 1)
R
L
= 2 kW, C
L
= 100 pF, f = 100 kHz, V
IN
= 10 mV
PP
)
Total Harmonic Distortion (f = 1 kHz, AV = 10,
R
L
= 2 kW, V
CC
= 30 V, V
OUT
= 2 V
PP
)
0.2
0.5
0.4
0.9
0.08
1
10
26
26
27
27
5.0
50
50
V/ms
MHz
%
mV
28
80
20
7.0
20
100
100
40
40
10
20
27
60
2.0
3.0
mV
mV
mV/°C
nA
V/mV
dB
mA
mA
mA
mA
V
OP AMP 2 (INDEPENDENT OP AMP)
(V
CC
= 5.0 V, T
A
= 25°C unless otherwise noted)
V
IO
DV
IO
I
IO
I
B
AVD
Input Offset Voltage
T
A
= 25°C
−40
v
T
A
v
+105°C
Input Offset Voltage Drift (−40
v
T
A
v
+105°C)
Input Offset Current
T
A
= 25°C
−40
v
T
A
v
+105°C
Input Bias Current
T
A
= 25°C
−40
v
T
A
v
+105°C
Large Signal Voltage Gain (V
CC
= 15 V,
R
L
= 2 kW, V
OUT
= 1.4 V to 11.4 V)
Power Supply Rejection (V
CC
= 5 V to 30 V)
T
A
= 25°C
−40
v
T
A
v
+105°C
50
25
65
100
dB
100
20
7.0
2.0
75
150
150
200
V/mV
nA
0.5
2.0
3.0
mV/°C
nA
mV
PSRR
1. Guaranteed by design and/or characterization.
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3
NCS1002
ELECTRICAL CHARACTERISTICS (continued)
Symbol
Characteristics
Conditions
Min
Typ
Max
Unit
OP AMP 2 (INDEPENDENT OP AMP) (continued)
(V
CC
= 5.0 V, T
A
= 25°C unless otherwise noted)
V
ICM
Input Common Mode Voltage Range (Note 2)
(V
CC
= +30 V)
T
A
= 25°C
−40
v
T
A
v
+105°C
CMRR
Common Mode Rejection Ratio (Note 4)
0 to V
CC
−
1.7 V,
T
A
= 25°C
0 to V
CC
−
2.2 V
−40
v
T
A
v
+105°C
I
SOURCE
I
O
I
SINK
V
OH
Output Current Source (V
CC
= 15 V, V
OUT
= 2 V, V
ID
= +1 V)
Short−Circuit to GND (V
CC
= 15 V)
Output Current Sink (V
ID
=
−1
V)
Output Voltage Swing, High (V
CC
= 30 V)
V
CC
= +15 V, V
OUT
= 0.2 V
V
CC
= +15 V, V
OUT
= 2 V
R
L
= 2 kW, T
A
= 25°C
−40
v
T
A
v
+105°C
R
L
= 10 kW, T
A
= 25°C
−40
v
T
A
v
+105°C
V
OL
SR
GBP
THD
e
noise
I
K
V
ref
Output Voltage Swing, Low
R
L
= 10 kW, T
A
= 25°C
−40
v
T
A
v
+105°C
Slew Rate (AV = +1, V
i
= 0.5 V to 3 V, V
CC
= 15 V, R
L
= 2 kW, C
L
= 100 pF)
Gain Bandwidth Product (V
CC
= 30 V, AV = +1,
R
L
= 2 kW, C
L
= 100 pF, f = 100 kHz, V
IN
= 10 mV
PP
) (Note 4)
Total Harmonic Distortion (f = 1 kHz, AV = 10,
R
L
= 2 kW, V
CC
= 30 V, V
OUT
= 2 V
PP
)
Equivalent Input Noise Voltage (f = 1 kHz, R
S
= 100
W,
V
CC
= 30 V)
Cathode Current
Reference Voltage (I
K
= 1 mA)
T
A
= 25°C
−40
v
T
A
v
+105°C
DV
ref
I
min
I ZKA I
Reference Deviation over Temperature (V
KA
= V
ref
, I
K
= 10 mA,
−40
v
T
A
v
+105°C) (Note 4)
Minimum Cathode Current for Regulation (V
KA
w
2.45 V
f
)
Dynamic Impedance (Note 3)
(V
KA
= V
ref
, I
K
= 1 mA to 100 mA, f < 1 kHz)
0.075
2.49
2.48
2.5
2.5
7.0
40
0.2
0.2
0.5
0.4
0.9
0.08
50
1
10
26
26
27
27
5.0
50
50
V/ms
MHz
%
nV/√Hz
mV
28
0
0
70
60
20
40
40
10
20
27
60
mA
mA
mA
mA
V
85
V
CC
−
1.5
V
CC
−
2.0
dB
V
VOLTAGE REFERENCE
100
2.51
2.52
30
75
0.5
mV
mA
W
mA
V
2. The input common−mode voltage of either input signal should not be allowed to go negative by more than 0.3 V. The upper end of the
common−mode range is V
CC
−
1.5 V. Both inputs can go to V
CC
+ 0.3 V without damage.
3. The Dynamic Impedance is defined as l ZKA l =
DV
KA
/
DI
K
.
4. Guaranteed by design and/or characterization.
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4
NCS1002
1.4
INPUT OFFSET VOLTAGE (mV)
1.2
1.0
0.8
0.6
0.4
0.2
0
−50
−30
−10
10
30
50
70
90
110
130
OP1
BIAS CURRENT (pA)
25
20
15
10
5
0
−50
−30
−10
TEMPERATURE (°C)
10
30
50
70
TEMPERATURE (°C)
90
110
Figure 1. Input Offset Voltage vs. Temperature
2.6
2.58
2.56
2.54
Vref (V)
2.5
2.48
2.46
2.44
2.42
2.4
0
10
20
30
40
50
60
70
80
90
100
2.48
−40
−20
Vref (V)
2.52
2.51
2.52
Figure 2. IB vs. Temperature
2.5
2.49
0
20
40
60
80
100
CATHODE CURRENT IK (mA)
TEMPERATURE (°C)
Figure 3. Vref as a Function of IK
S
−
Stable; U
−
Unstable
25
s u u u u u u u u u u u
20 s s u u u u u u u u u u
15 s s s u u u u u u u u u
14 s s s s u u u u u u u s
13 s s s s s u u u u u u s
12 s s s s s u u u u u s s
11 s s s s s s s s s s s s
10 s s s s s s s s s s s s
9 s s s s s s s s s s s s
8 s s s s s s s s s s s s
7 s s s s s s s s s s s s
6 s s s s s s s s s s s s
5 s s s s s s s s s s s s
4 s s s s s s s s s s s s
3 s s s s s s s s s s s s
2 s s s s s s s s s s s s
1 s s s s s s s s s s s s
0.5 s s s s s s s s s s s s
100 pF 500 1000 1500 2000 3 nF
CAPACITIVE LOAD ON Vref (Pin 3)
u
u
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
4
u
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
5.8
0.5
DYNAMIC IMPEDANCE (W)
0.45
0.4
0.35
0.3
0.25
Figure 4. Vref Over Temperature
IK (mA)
0.2
−40−30−20−10
0
10 20 30 40 50 60 70 80 90 100
TEMPERATURE (°C)
Figure 5. Region of Reference Stability vs.
Capacitive Load (Pin 3)
Figure 6. Ref Dynamic Impedance vs.
Temperature
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