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| Semiconductor SL71051 CC, CV Control for Battery Charger & Adaptor Description SL71051 is a highly integrated solution for SMPS applications requiring CV (constant voltage) and CC (constant current) mode. SL71051 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). SL71051, 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 input voltage range (2.5V to 12V) * Precision internal voltage reference (1.21V 1.0%) * Low external component count * Current sink output stage * Easy compensation * Low ac mains voltage rejection Applications * Adapters * Battery chargers Ordering Information Type NO. SL71051 Marking 701 Package Code SOT - 26 KSD-I5P001-000 1 SL71051 Outline Dimensions unit : mm Internal Block 6 Vcc 1.21V Out 3 1 2 3 6 5 4 + - 1 Vctrl 200mV + - Ictrl 4 5 Vsense 2 GND 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 2 Value 14 500 0 to 85 -55 to 150 Unit V * Mount on a glass epoxy circuit board of 30x30mm Pad dimension of 50mm Operating Conditions Characteristic DC Supply Voltage Symbol VCC Value 2.5 to 12 Unit V KSD-I5P001-000 2 SL71051 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 [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 Ta = 25 0 < Ta < 85 Min. - Typ. 1.2 1.5 Max. 2 - Unit ICC Gmv Vref libv Ta = 25 0 < Ta < 85 Ta = 25 0 < Ta < 85 Ta = 25 0 < Ta < 85 1 1.198 1.186 1.5 196 192 - 3.5 2.5 1.210 1.210 50 100 7.0 200 25 30 1.222 1.234 204 208 - / V Gmi Vsense Iibi Ta = 25 0 < Ta < 85 Iout = 2.5 , Ta = 25 0 < Ta < 85 Ta = 25 0 < Ta < 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 -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. KSD-I5P001-000 3 SL71051 Fig.1 Supply current vs Ambient Temperature Icc v s Ta 2.0 Vcc:12V 1.6 Icc[mA] 1.2 0.8 0.4 0.0 0 20 40 1.220 Vre f[V] 1.215 1.210 1.205 1.200 2.5V Vcc 12V 1.225 Fig.2 Vref vs Ambient Temperature Vref v s Ta Vcc:5.0V Vcc:2.5V Ta[] 60 80 100 0 20 40 Ta[] 60 80 100 Fig.3 Vsense vs Ambient Temperature V s ens e vs Ta 201.5 201.0 Vse nse [m V] 200.5 200.0 199.5 199.0 198.5 Vcc:5.0V Vcc:12V Vcc:2.5V Fig.4 Vsense pin input bias current vs Ambient Temperature Iibv v s Ta 120 100 Iibv[nA] 80 60 40 20 0 Vcc:2.5V 0 20 40 Ta[] 60 80 100 Vcc:12V Vcc:5.0V 0 20 40 Ta[] 60 80 100 Fig.5 Ictrl pin input bias current vs Ambient Temperature Iibi v s Ta 30 2.5V Vcc 12V 28 Fig.6 Output Short circuit current vs Ambient Temperature Ios v s Ta 60 50 Ios[m A] 40 30 Vcc:2.5V 20 10 0 Vcc:5.0V Vcc:12V Iibi[uA] 26 24 22 20 0 20 40 60 80 100 0 20 40 Ta[] 60 80 100 Ta[] KSD-I5P001-000 4 SL71051 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-I5P001-000 5 |
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