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CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER FOR ADATPTORS AND BATTERY CHARGERS
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
TJ1051
SOT-23-6LD
SOP-8
ORDERING INFORMATION
Device Marking 1051 TJ1051 Package SOT-23-6LD SOP-8 TJ1051CL TJ1051CD
DESCRIPTION
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 ORed ouputs - common collectors), and a current sensing circuit. The voltage reference combined with one operational amplifiers makes it an ideal voltage controller, and the
PIN CONNECTIONS (TOP VIEW)
SOT-23-6 1
Vctrl Vcc
SOP-8 6 5 4 1 2 3
Vctrl Vcc Vsense Gnd 8 Out 7 Ictrl 6 Nc 5
2 Gnd Vsense
other low voltage reference combined with the other Ictrl 3 Out 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 brideg to be connected to the output Block Diagram of the power supply (adaptor, battery charger) to set the voltage regulation by dividing the 1.210V 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 vlotage threshold. Optional compensation components (R and C). 200mV
4 Nc
Vcc Out Vctrl
APPLICATIONS
BATTERY CHARGERS ADAPTERS
Gnd Ictrl Vsense
TJ1051, is ideal for smallest package available, is ideal for space shrinked applications such as battery chargers and adaptors.
Jan. 2007-Rev 1.0
HTC
1
CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER FOR ADATPTORS AND BATTERY CHARGERS
PIN DESCRIPTION
SOT23-6 Pinout Name Vcc GND Vctrl Ictrl Out Vsense SOP-8 Pinout Name Vcc GND Vctrl Ictrl Out Vsense Nc Nc Pin# 2 8 1 6 7 3 5 4 Type Power Supply Power Supply Analog Input Analog Input Current Shink Output Analog Input Pin# 6 2 1 4 3 5 Type Power Supply Power Supply Analog Input Analog Input Current Shink Output Analog Input
TJ1051
Function Positive Power Supply Line Ground Line. 0V Reference For All Voltages Input Pin of the Voltge Control Loop Input Pin of the Current Control Loop Output Pin. Sinking Current Only Input Pin of the Current Control Loop
Function Positive Power Supply Line Ground Line. 0V Reference For All Voltages Input Pin of the Voltge Control Loop Input Pin of the Current Control Loop Output Pin. Sinking Current Only Input Pin of the Current Control Loop
ABSOLUTE MAXIMUM RATINGS Symbol Vcc Vi Top Tj Parameter DC Supply Voltage Input Voltage Operating Free Air Temperature Range Maximum Junction Temperature Value 14 -0.3 to Vcc 0 to 85 150 Unit V V
OPERATION CONDITIONS Symbol Parameter Vcc DC Supply Conditions Value 2.5 to 12 Unit V
Jan. 2007-Rev 1.0
HTC
2
CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER
FOR ADATPTORS AND BATTERY CHARGERS
ELECTRICAL CHARACTERISTICS
Tamb = 25 and Vcc = +5V (unless otherwise specified)
TJ1051
Symbol
Total Current Consumption
Parameter Total Supply Current - not taking the output sinking current into account Transconduction Gain (Vctrl). Sink Current Only 1) Voltage Control Loop Referenc Input Bias Current (Vctrl)
2)
Test Condition
Min
Typ
Max
Unit
Icc
Tamb 0 < Tamb < 85
1.1 1.2
2
mA
Voltage Control Loop
Gmv Vref Iibv
Tamb 0 < Tamb < 85 Tamb 0 < Tamb < 85 Tamb 0 < Tamb < 85
1 1.198 1.186
3.5 2.5 1.21 50 100 1.222 1.234
mA/mV V nA
Current Control Loop
Gmi
Transconduction Gain (Ictrl). Sink Current Only 3)
4)
Tamb 0 < Tamb < 85 Iout =2.5mA Tamb 0 < Tamb < 85 Tamb 0 < Tamb < 85
1.5 196 192
7 200 25 50 204 208
mA/mV mV
Vsense Current Control Loop Reference Iibi
Current out of pin Ictrl at - 200mV
Output Stage
Vol Ios
Low output voltage at 10 mA sinking Current Output Short Circuit Current. Output to Vcc. Sink Current Only
Tamb 0 < Tamb < 85 Tamb 0 < Tamb < 85
200 27 35 50
mV mA
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 OUT will be increased by 3.5mA. 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 room temperature. 3) When the positive input at Ictrl is lower than - 200mV, and the voltage is decreased by 1mV, the sinking current at the output OUT will be increased by 7mA. 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 transconduction operational amplifier.
Jan. 2007-Rev 1.0
HTC
3
CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER FOR ADATPTORS AND BATTERY CHARGERS
TJ1051
Figure 1 : Typical Adaptor or Battery Charger Application Using TJ1051
D
Top primary
OUT
TJ1051
R2
1.210V
Vcc Out
Rout Rvc Cvc1 2.2n 1 Cvc2 22pF Cic1 2.2nF
IL
Vctrl 200mV
Gnd Ictrl +
Ric2 500
Vsense
Ric1 22K R1
+
Vsense
Load
OUT
Rsense
IL
In the avove application schematic, the TJ1051 is used on the secondary side of a flyback adapte (or battary charger) to provide an accurate control of voltage and current. The above feedback loo is made with an optocoupler.
Jan. 2007-Rev 1.0
HTC
4

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