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| Semiconductor SL71053 CC, CV Control for Battery Charger & Adaptor Description SL71053 is a highly integrated solution for SMPS applications requiring CV (constant voltage) and CC (constant current) mode. SL71053 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. SL71053, housed in one of the smallest package available, is ideal for space shrink applications such as adapters and battery chargers. Features * Constant voltage & constant current control * Wide operating voltage range (2.2V to 14V) * Precision internal voltage reference (1.21V 1.0%) * Precision internal CC AMP reference (80mV Typ.) * Low external component count * Current sink output stage * Easy compensation Applications * Adapters * Battery chargers Ordering Information Type NO. SL71053 Marking 703 Package Code SOT - 26 KSD-I5P005-000 1 SL71053 Outline Dimensions unit : mm Internal Block 1 2 3 6 5 4 Typical Application : Adapter or Battery Charger Application Using SL71053 In the above application schematic, the SL71053 is used on the secondary side of a flyback adapter (or battery charger) to provide an accurate control of voltage and current. The above feedback loop is made with an optocoupler. KSD-I5P005-000 2 SL71053 Pin Description Name Vctrl Gnd Out Ictrl Vsense VCC Pin No. 1 2 3 4 5 6 Type Analog Input Power Supply Current Sink Output Analog Input Analog Input Power Supply Function Input Pin of the Voltage Control Loop Ground Line. 0V Reference For All Voltages Output Pin. Sinking Current Only Input Pin of the Current Control Loop Input Pin of the Current Control Loop DC Supply Line Absolute Maximum Ratings Characteristic DC Supply Voltage Power Dissipation Operating Ambient Temperature Range Storage Temperature Range Symbol Vcc Pd * Topr Tstg Value 14 500 0 to 85 -55 to 150 Unit V * Mount on a glass epoxy circuit board of 30x30mm Pad dimension of 50mm2 Operating Conditions Characteristic DC Supply Voltage Symbol VCC Value 2.2 ~ 14V Unit V Electrical Characteristics Ta = 25 and VCC = 5V (unless otherwise specified) Characteristic [Total Current Consumption] Total Supply Current - not taking the output sinking current into account Symbol Test Condition Min. Typ. Max. Unit Ta = 25 - 1.2 1.5 2 ICC 0 < Ta < 85 - KSD-I5P005-000 3 SL71053 Electrical Characteristics Ta = 25 and VCC = 5V (unless otherwise specified) Characteristic [Voltage Control Loop] Transconduction Gain (Vctrl). Sink Current Only 1) Voltage Control Loop Reference 2) Input Bias Current (Vctrl) [Current Control Loop] Transconduction Gain (lctrl). sink Current Only 3) Current Control Loop Reference 4) Symbol Test Condition Min. Typ. Max. Unit Gmv Vref libv Ta = 25 0 < Ta < 85 Ta = 25 0 < Ta < 85 Ta = 25 0 < Ta < 85 1 1.198 1.186 - 3.5 2.5 1.210 1.210 50 100 1.222 1.234 - / V Gmi Vsense Iibi Ta = 25 0 < Ta < 85 Iout = 2.5 , Ta = 25 0 < Ta < 85 Ta = 25 0 < Ta < 85 1.5 77 75 - 7.0 80 25 30 83 85 - / Current out of pin ICTRL at -200mV [Output Stage] Low output Voltage at 10mA Sinking current Output Short Circuit Current. Output to VCC. Sink Current Only Vol Ios - - 200 - - - 35 70 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 at room temperature. 3) When the positive input at ICTRL is lower than -80mV, 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 -80mV. 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. KSD-I5P005-000 4 SL71053 Electrical Characteristic Curves Fig.1 Supply current vs Ambient Temperature Icc v s Ta 1.5 1.222 Fig.2 Vref vs Ambient Temperature Vref v s Ta 2.2V Vcc 12V 1.218 1.214 Vref[V] 1.21 1.206 1.2 Vcc:12V Icc[mA] 0.9 0.6 Vcc:5.0V Vcc:2.2V 0.3 1.202 1.198 0.0 0 15 30 45 Ta[] 60 75 90 0 15 30 45 Ta[] 60 75 90 Fig.4 Vsense pin input bias current vs Fig.3 Vsense vs Ambient Temperature Vs ens e vs Ta 83 82 81 80 79 78 77 0 15 30 45 Ta[] 60 75 90 Iibv[nA] 100 Ambient Temperature Iibv v s Ta 80 Vcc:12V Vsense[mV] Vcc:2.2V Vcc:5.0V Vcc:12V 60 40 Vcc:5.0V 20 Vcc:2.2V 0 0 15 30 45 Ta[] 60 75 90 Fig.5 Ictrl pin input bias current vs Ambient Temperature Iibi v s Ta 50 Fig.6 Output Short circuit current vs Ambient Temperature Io s v s Ta 70 2.2V Vcc 12V 40 30 20 10 0 0 15 30 45 Ta[] 60 75 90 60 Vcc:12V Iibi[uA] Ios[mA] 50 Vcc:5.0V 40 Vcc:2.2V 30 20 0 15 30 45 Ta[] 60 75 90 KSD-I5P005-000 5 SL71053 The AUK Corp. products are intended for the use as components in general electronic equipment (Office and communication equipment, measuring equipment, home appliance, etc.). Please make sure that you consult with us before you use these AUK Corp. products in equipments which require high quality and / or reliability, and in equipments which could have major impact to the welfare of human life(atomic energy control, airplane, spaceship, transportation, combustion control, all types of safety device, etc.). AUK Corp. cannot accept liability to any damage which may occur in case these AUK Corp. products were used in the mentioned equipments without prior consultation with AUK Corp.. Specifications mentioned in this publication are subject to change without notice. KSD-I5P005-000 6 |
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