HTC TJ1051_08

CONSTANT VOLTAGE & CONSTANT CURRENT CONTROLLER
FEATURES
z
z
z
z
z
z
z
TJ1051
SOT-23 6L
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
SOP-8
APPLICATION
z Battery Chargers
z Adapters
ORDERING INFORMATION
Device
Package
TJ1051SF6
SOT-23 6L
TJ1051D
SOP-8
DESCRIPSION
TJ1051 is a highly integrated solution for SMPS applications requiring constant voltage and constant current
mode. TJ1051 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 :
z 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.
z A sense resistor having a value and allowable dissipation power which need to be chosen according to the
internal voltage threshold.
TJ1051 is ideal for space shrunk applications such as adapters and battery chargers.
Absolute Maximum Ratings
(TA = 25℃, unless otherwise specified)
CHARACTERISTIC
SYMBOL
MIN.
MAX.
UNIT
DC Supply Voltage
VCC
-
14
V
Input Voltage
VIN
-0.3
VCC
V
TOPR
0
85
℃
TJ
-
150
℃
SYMBOL
MIN.
MAX.
UNIT
VCC
2.5
12
V
Operating Free Air Temperature Range
Maximum Junction Temperature
Operating Conditions (TA=25℃)
CHARACTERISTIC
DC Supply Voltage
2008 – Rev. 1.1
-1-
HTC
CONSTANT VOLTAGE & CONSTANT CURRENT CONTROLLER
TJ1051
Ordering Information
Package
Order No.
Package Marking
Supplied As
Status
SOT-23 6L
TJ1051SF6
S
Reel
Active
SOP-8
TJ1051D
TJ1051
Reel
Active
Package Type
SF6 : SOT-23 6L
D : SOP-8
TJ 1051
Root Name
Product Code
PIN CONFIGURATION
VCC VSENSE ICTRL
6
5
4
1
2
3
VCTRL
VCC
VSENSE
NC
VCTRL GND OUT
SOT-23 6L
1
2
3
4
8
7
6
5
GND
OUT
ICTRL
NC
SOP-8
PIN DESCRIPTION
Pin No.
SOT-23 6L
SOP-8
Name
Function
Name
Function
1
VCTRL
Analog Input
VCTRL
Analog Input
2
GND
Ground
VCC
Power Supply
3
OUT
Current Sink Output
VSENSE
Analog Input
4
ICTRL
Analog Input
NC
-
5
VSENSE
Analog Input
NC
-
6
VCC
Power Supply
ICTRL
Analog Input
7
-
-
OUT
Current Sink Output
8
-
-
GND
Ground
2008 – Rev. 1.1
-2-
HTC
CONSTANT VOLTAGE & CONSTANT CURRENT CONTROLLER
TJ1051
ELECTRICAL CHARACTERISTICS
(TA=25℃ and VCC = +5V, unless otherwise specified)
Symbol
Parameters
Condition
Min.
Typ.
Max.
Unit
2
mA
Total Current Consumption
ICC
Total Supply Current - not taking the
TA = 25℃
1.1
output sinking current into account
0 < TA < 85°C
1.2
Voltage Control Loop
GMV
VREF
IIBV
Transconduction Gain (VCTRL).
Sink Current Only
(Note 1)
Voltage Control Loop (Note 2)
Input Bias Current (VCTRL)
TA = 25℃
0 < TA < 85°C
1
TA = 25℃
1.198
0 < TA < 85°C
1.186
3.5
mA/mV
2.5
1.21
TA = 25℃
50
0 < TA < 85°C
100
1.222
1.234
V
nA
Current Control Loop
GMI
VSENSE
IIBI
Transconduction Gain (ICTRL). Sink
Current Only
(Note 3)
Current Control Loop (Note 4)
Current out of pin ICTRL at -200mV
TA = 25℃
0 < TA < 85°C
1.5
Iout = 2.5 mA
196
0 < TA < 85°C
192
7
200
TA = 25℃
30
0 < TA < 85°C
40
mA/mV
204
208
mV
μA
Output Stage
VOL
IOS
Low output voltage at 10 mA sinking
TA = 25℃
current
0 < TA < 85°C
Output Short Circuit Current. Output to
TA = 25℃
27
VCC. Sink Current Only
0 < TA < 85°C
35
200
mV
60
mA
Note 1. If the voltage on VCTRL (the negative input of the amplifier) is higher than the positive amplifier input (VREF=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 ICTRL 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.
2008 – Rev. 1.1
-3-
HTC
CONSTANT VOLTAGE & CONSTANT CURRENT CONTROLLER
TJ1051
TYPICAL APPLICATION CIRCUIT
Fig 1. Typical Adaptor or Battery Charger Application Using TJ1051
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.
2008 – Rev. 1.1
-4-
HTC