TECHNICAL DATA Constant Voltage and Constant Current Controller for Adaptors and Battery Chargers IK3052A Description IK3052A is a highly integrated solution for SMPS applications requiring constant voltage and constant current mode. IK3052A integrates one voltage reference, two operational amplifiers (with ORed outputs – 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 (adapter, 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. • Optional compensation components (R and C). IK3052A, is ideal for smallest package available, is ideal for space shrinked applications such as adapters and battery chargers. PIN CONNECTION (top view) 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 ORDERI NG I NFORM ATI ON Device IK3052AS2T Operating Temperature Range TA = 0° to 85° C for all packages Package Plastic SOT23-6 Shipping Tape& Reel Pin Definitions and Functions SOT23-6 Pin out Name Vcc GND Vctrl Ictrl Out Vsense Pin# 6 2 1 4 3 5 Type Power Supply Power Supply Analog Input Analog Input Current Sink Output Analog Input Function Positive Power Supply Line Ground Line. 0V Reference For All Voltages Input Pin of the Voltage Control Loop Input Pin of the Current Control Loop Output Pin. Sinking Current Only Input Pin of the Current Control Loop 2011, February, Rev. 01 IK3052A Absolute Maximum Ratings Symbol Vcc Vi Top Tj Parameter DC Supply Voltage Input Voltage Operating Free Air Temperature Range Maximum Junction Temperature Value 20 -0.3 to Vcc 0 to 85 150 Unit V V o C o C * Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. Operation Conditions Symbol Vcc Parameter DC Supply Conditions Value 2.5 to 18 Unit V Electrical Characteristics Tamb = 25°C and Vcc = +5V (unless otherwise specified) Symbol Parameter Total Current Consumption Total Supply Current – not taking the Icc output sinking current into account Voltage Control Loop Transconduction Gain (Vctrl). Sink Gmv 1) Current Only Vref Voltage Control Loop Reference Iibv Input Bias Current (Vctrl) 2) Current Control Loop Transconduction Gain (Ictrl). Sink Gmi 3) Current Only 4) Vsense Current Control Loop Reference Iibi Current out of pin Ictrl at -200mV Output Stage Low output voltage at 10 mA sinking Vol current Output Short Circuit Current. Output Ios to Vcc. Sink Current Only Test Condition Min Tamb 0 < Tamb < 85°C Tamb 0 < Tamb < 85°C Tamb 0 < Tamb < 85°C Tamb 0 < Tamb < 85°C Tamb 0 < Tamb < 85°C Iout = 2.5 mA Tamb 0 < Tamb < 85°C Tamb 0 < Tamb < 85°C Tamb 0 < Tamb < 85°C Tamb 0 < Tamb < 85°C Typ Max 1.1 1.2 2 1 3.5 2.5 1.204 1.186 1.21 Unit mA mA/mV 1.216 1.234 V 50 100 nA 1.5 7 mA/mV 196 192 200 204 208 mV 25 50 μA 200 mV 27 35 50 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 transconductance operational amplifier. The internal Voltage Reference is fixed by bandgap, and trimmed to 0.5% accuracy at 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 trans-conduction operational amplifier. 2011, February, Rev. 01 IK3052A TYPICAL APPLICATION CIRCUIT Typical adaptor or battery charger application using the device 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. Attention! For measurements of electrical characteristics of IK3052A and also in field application of the devices in composition of equipment, it is necessary to apply capacitance Cout ≥ 0.47 pF on pin 3 (Out). 2011, February, Rev. 01 IK3052A PACKAGE DIMENSION SOT-23-6 Symbol A A1 A2 b c D E E1 e e1 L L1 θ Dimensions In Millimeters Min 1.050 0.000 1.050 0.300 0.100 2.820 1.500 2.650 Max 1.250 0.100 1.150 0.500 0.200 3.020 1.700 2.950 Dimensions In Inches Min 0.041 0.000 0.041 0.012 0.004 0.111 0.059 0.104 0.950TYP 1.800 0.037TYP 2.000 0.071 0.600REF 0.300 0° Max 0.049 0.004 0.045 0.020 0.008 0.119 0.067 0.116 0.079 0.024REF 0.600 8° 0.012 0° 0.024 8° 2011, February, Rev. 01