CONSTANT VOLTAGE & CONSTANT CURRENT CONTROLLER
FEATURES
Constant Voltage and Constant Current Control
Low Voltage Operation
Precision Internal Component Count
Current Sink Output Stage
Easy Compensation
Low AC Mains Voltage Rejection
Moisture Sensitivity Level 3
TJ1052
SOT-23 6L
APPLICATION
Battery Chargers
Adapters
ORDERING INFORMATION
Device
TJ1052SF6
TJ1052GSF6
Package
SOT-23 6L
DESCRIPTION
TJ1052 is a highly integrated solution for SMPS applications requiring constant voltage and constant current
mode. TJ1052 integrates one voltage reference, two operational amplifiers (with one output - common
collectors), and a current sensing circuit. The voltage reference combined with one operational amplifier makes
it an ideal voltage controller, and the other low voltage reference combined with the other operational amplifier
makes it an ideal current limiter for output low side current sensing. The current threshold is fixed and precise.
The only external components are :
A resistor bridge to be connected to the output of the power supply (adaptor, battery charger) to set the
voltage regulation by dividing the desired output voltage to match the internal voltage reference value.
A sense resistor having a value and allowable dissipation power which need to be chosen according to the
internal voltage threshold.
TJ1052 is ideal for space shrunk applications such as adapters and battery chargers.
Absolute Maximum Ratings
(T
A
= 25℃, unless otherwise specified)
CHARACTERISTIC
DC Supply Voltage
Input Voltage
Operating Free Air Temperature Range
Maximum Junction Temperature
SYMBOL
V
CC
V
IN
T
OPR
T
J
MIN.
-
-0.3
0
-
MAX.
20
V
CC
85
150
UNIT
V
V
℃
℃
Operating Conditions
(T
A
=25℃)
CHARACTERISTIC
DC Supply Voltage
SYMBOL
V
CC
MIN.
2.5
MAX.
18
UNIT
V
Jul. 2010 – Preliminary
-1-
HTC
CONSTANT VOLTAGE & CONSTANT CURRENT CONTROLLER
Ordering Information
Package
SOT-23 6L
SOT-23 6L
TJ1052
Status
Contact us
Contact us
Order No.
TJ1052SF6
TJ1052GSF6
Package Marking
TJ1052
TJ1052
Supplied As
Reel
Reel
PIN CONFIGURATION
VCC VSENSE ICTRL
6
1
VCTRL
5
2
GND
4
3
OUT
PIN DESCRIPTION
Pin No.
1
2
3
4
5
6
SOT-23 6L
Name
V
CTRL
GND
OUT
I
CTRL
V
SENSE
V
CC
Function
Analog Input
Ground
Current Sink Output
Analog Input
Analog Input
Power Supply
SOT-23 6L
Jul. 2010 – Preliminary
-2-
HTC
CONSTANT VOLTAGE & CONSTANT CURRENT CONTROLLER
ELECTRICAL CHARACTERISTICS
TJ1052
(T
A
=25℃ and V
CC
= +5V, unless otherwise specified)
Symbol
Parameters
Condition
Min.
Typ.
Max.
Unit
Total Current Consumption
I
CC
Total Supply Current - not taking the
output sinking current into account
T
A
= 25℃
0 < T
A
< 85°C
1.1
1.2
2
mA
Voltage Control Loop
G
MV
V
REF
I
IBV
Transconduction Gain (V
CTRL
).
Sink Current Only
(Note 1)
T
A
= 25℃
0 < T
A
< 85°C
T
A
= 25℃
0 < T
A
< 85°C
T
A
= 25℃
0 < T
A
< 85°C
1
1.198
1.186
3.5
2.5
1.21
200
300
1.222
1.234
mA/mV
V
nA
Voltage Control Loop
(Note 2)
Input Bias Current (V
CTRL
)
Current Control Loop
G
MI
V
SENSE
I
IBI
Transconduction Gain (I
CTRL
).
Sink Current Only
(Note 3)
T
A
= 25℃
0 < T
A
< 85°C
Iout = 2.5 mA
0 < T
A
< 85°C
T
A
= 25℃
0 < T
A
< 85°C
1.5
196
192
7
200
30
40
204
208
mA/mV
mV
μA
Current Control Loop
(Note 4)
Current out of pin I
CTRL
at -200mV
Output Stage
V
OL
I
OS
Low output voltage at 10 mA sinking
current
Output Short Circuit Current. Output to
V
CC
. Sink Current Only
T
A
= 25℃
0 < T
A
< 85°C
T
A
= 25℃
0 < T
A
< 85°C
200
500
45
60
90
mV
mA
Note 1. If the voltage on V
CTRL
(the negative input of the amplifier) is higher than the positive amplifier input (V
REF
=1.210V), and it is increased
by 1mV, the sinking current at the output will be increased by 3.5mA.
Note 2. The internal Voltage Reference is set at 1.210V (bandgap reference). The voltage control loop precision takes into account the
cumulative effects of the internal voltage reference deviation as well as the input offset voltage of the trans-conductance operational
amplifier. The internal Voltage Reference is fixed by bandgap, and trimmed to 0.5% accuracy at room temperature.
Note 3. When the positive input at I
CTRL
is lower than -200mV, and the voltage is decreased by 1mV, the sinking current at the output will be
increased by 7mA.
Note 4. The internal current sense threshold is set to -200mV. The current control loop precision takes into account the cumulative effects of
the internal voltage reference deviation as well as the input offset voltage of the trans-conduction operational amplifier.
Jul. 2010 – Preliminary
-3-
HTC
CONSTANT VOLTAGE & CONSTANT CURRENT CONTROLLER
TYPICAL APPLICATION CIRCUIT
TJ1052
TJ1052
1.210 V
+
+
V
CC
6
3
OUT
R1
R
led
R
VC
1
C
VC
1
1
V
CTRL
C
IC
1
2
GND
R
IC
1
V
OUT
-
+
200mV
-
5
V
SENSE
R
IC
2
R
SENSE
I
OUT
4
I
CTRL
R2
Fig 1. Typical Adaptor or Battery Charger Application Using TJ1052
In the above application schematic, the device is used on the secondary side of a flyback adaptor (or battery
charger) to provide an accurate control of voltage and current. The above feedback loop is made with an
optocoupler.
Jul. 2010 – Preliminary
-4-
HTC
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