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| TSM1013 Constant Voltage and Constant Current Controller for Battery Chargers and Adaptors s s s s s Constant voltage and constant current control Low voltage operation Low external component count Current sink output stage Easy compensation D SO-8 VOLTAGE REFERENCE s s Fixed output voltage reference 2.5V 0.5% and 1% Voltage precision DESCRIPTION TSM1013 is a highly integrated solution for SMPS applications requiring CV (constant voltage) and CC (constant current) mode. TSM1013 integrates one voltage reference and two operational amplifiers. The voltage reference combined with one operational amplifier makes it an ideal voltage controller. The other operational, combined with few external resistors and the voltage reference, can be used as a current limiter. S Mini SO8 PIN CONNECTIONS (top view) APPLICATIONS s s Adapters Battery Chargers 1 Vref 2 Cc3 Cc+ Marking M1013 M1013A M806 M807 Vcc 8 Cc Out 7 Gnd 6 Cv Out 5 ORDER CODE Part Number TSM1013I TSM1013AI TSM1013I TSM1013AI Temperature Package Range S D 0 0 0 0 to 105C to 105C to 105C to 105C 4 Cv- Note: S: MiniSO only available in Tape & Reel with T suffix D: SO is available in Tube (D) and in Tape & Reel (DT) February 2004 1/8 TSM1013 1 PIN DESCRIPTION PIN DESCRIPTION SO8 & Mini SO8 Pinout Name Vref CcCc+ CvCv Out Gnd Cc Out Vcc Pin # 1 2 3 4 5 6 7 8 Type Analog Output Analog Input Analog Input Analog Input Analog Output Power Supply Analog Output Power Supply Function Voltage Reference Input pin of the operationnal amplifier Input pin of the operationnal amplifier Input pin of the operationnal amplifier Output of the operational amplifier Ground Line. 0V Reference For All Voltages Output of the operational amplifier Power supply line. ABSOLUTE MAXIMUM RATINGS Symbol Vcc Vi Tstg Tj Iref ESD Rthja Rthja DC Supply Voltage DC Supply Voltage (50mA =< Icc) Input Voltage Storage temperature Junction temperature Voltage reference output current Electrostatic Discharge Thermal Resistance Junction to Ambient Mini SO8 package Thermal Resistance Junction to Ambient SO8 package Value -0.3V to Vz -0.3 to Vcc -55 to 150 150 10 2 180 175 Unit V V C C mA KV C/W C/W OPERATING CONDITIONS Symbol Vcc Toper DC Supply Conditions Operational temperature Parameter Value 4.5 to Vz 0 to 105 Unit V C 2/8 ELECTRICAL CHARACTERISTICS 2 ELECTRICAL CHARACTERISTICS Parameter Test Condition Min.. Typ. Max. TSM1013 Tamb = 25C and Vcc = +18V (unless otherwise specified) Symbol Unit Total Current Consumption Icc Vz Total Supply Current, excluding current in Voltage Reference. Vcc clamp voltage Vcc = 18V, no load Tmin. < Tamb < Tmax. Icc = 50mA 1 28 mA V Operator 1 : Op-amp with non-inverting input connected to the internal Vref Vref+Vio DVio Input Offset Voltage + Voltage reference TSM1013 TSM1013A Input Offset Voltage Drift Tamb = 25C Tmin. Tamb Tmax. Tamb = 25C Tmin. Tamb Tmax. 2.5446 2.545 7 2.574 2.575 2.553 2.560 V V/C Operator 2 Vio DVio Iio Iib SVR Vicm CMR Input Offset Voltage TSM1013 TSM1013A Input Offset Voltage Drift Input Offset Current Input Bias Current Supply Voltage Rejection Ratio Input Common Mode Voltage Range Common Mode Rejection Ratio Tamb = 25C Tmin. Tamb Tmax. Tamb = 25C Tmin. Tamb Tmax. VCC = 4.5V to 28V Tamb = 25C Tmin. Tamb Tmax. Output stage Tamb = 25C Tmin. Tamb Tmax. 65 0 70 60 85 Tamb = 25C Tmin. Tamb Tmax. Tamb = 25C Tmin. Tamb Tmax. 1 0.5 7 2 20 50 100 Vcc-1.5 30 50 150 200 4 5 2 3 mV V/C nA nA dB V dB Gm Vol Ios Transconduction Gain. Sink Current Only1 Low level output voltage at 10 mA sinking current Output Short Circuit Current. Output to Vcc. Sink Current Only 1 3.5 2.5 200 600 50 mA/mV mV mA Tamb = 25C Tmin. Tamb Tmax. 27 Voltage reference Vref Reference Input Voltage, Iload=1mA TSM1013 1% precision TSM1013A 0.5% precision Reference Input Voltage Deviation Over Temperature Range Tamb = 25C Tmin. Tamb Tmax. Iload = 5mA Vcc = 18V, 0 < Iload < 10mA 2.519 2.532 2.545 20 2.57 2.557 30 20 10 V mV mV mV Vref RegLine Reference input voltage deviation over Vcc range. Reference input voltage deviation over RegLoad output current. 1) The current depends on the difference voltage beween the negative and the positive inputs of the amplifier. If the voltage on the minus input is 1mV higher than the positive amplifier, the sinking current at the output OUT will be increased by 3.5mA. 3/8 TSM1013 Fig. 1: Internal Schematic ELECTRICAL CHARACTERISTICS 1 Vref Vref Vcc 8 28V Cc out 7 2 CcCC 3 Cc+ Gnd 6 4 Cv- CV Cv out 5 Fig. 2: Typical Adapter Application Using TSM1013 D To primary OUT+ 1 Vcc Vref 28V R3 100 CV CV Out 8 R2 IL 5 4 + 7 Rvc1 22K Cvc1 2.2nF R1 Load Cic1 2.2nF OUT- R4 100K TSM1013 Cc+ CC Cv- 3 CC Out + Cc- Gnd 2 6 Ric1 22K R5 Vsense 10K Rsense IL Ric2 1K In the above application schematic, the TSM1013 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. 4/8 TSM1013 Principle of Operation and Application Hints 3 VOLTAGE AND CURRENT CONTROL Vsense = R5*Vref/(R4+R5) Ilim = R5*Vref/(R4+R5)*Rsense Equation 3 3.1 Voltage Control The voltage loop is controlled via a first transconductance operational amplifier, the resistor bridge R1, R2, and the optocoupler which is directly connected to the output. The relation between the values of R1 and R2 should be chosen as writen in Equation 1. R1 = R2 x Vref / (Vout - Vref) Equation 1 where Ilim is the desired limited current, and Vsense is the threshold voltage for the current control loop. Note that the Rsense resistor should be chosen taking into account the maximum dissipation (Plim) through it during full load operation. Plim = Vsense x Ilim. Equation 4 Where Vout is the desired output voltage. To avoid the discharge of the load, the resistor bridge R1, R2 should be highly resistive. For this type of application, a total value of 100K (or more) would be appropriate for the resistors R1 and R2. As an example, with R2 = 100K, Vout = 4.10V, Vref = 2.5V, then R1 = 41.9K. Note that if the low drop diode should be inserted between the load and the voltage regulation resistor bridge to avoid current flowing from the load through the resistor bridge, this drop should be taken into account in the above calculations by replacing Vout by (Vout + Vdrop). Therefore, for most adapter and battery charger applications, a quarter-watt, or half-watt resistor to make the current sensing function is sufficient. The current sinking outputs of the two transconnuctance operational amplifiers are common (to the output of the IC). This makes an ORing function which ensures that whenever the current or the voltage reaches too high values, the optocoupler is activated. The relation between the controlled current and the controlled output voltage can be described with a square characteristic as shown in the following V/I output-power graph. Fig. 3: Output voltage versus output current 3.2 Current Control The current loop is controlled via the second trans-conductance operational amplifier, the sense resistor Rsense, and the optocoupler. Vsense threshold is achieved externally by a resistor bridge tied to the Vref voltage reference. Its middle point is tied to the positive input of the current control operational amplifier, and its foot is to be connected to lower potential point of the sense resistor as shown on the following figure. The resistors of this bridge are matched to provide the best precision possible The control equation verifies: Rsense x Ilim = Vsense Equation 2 Vout Voltage regulation 0 TSM1013 Vcc : independent power supply Secondary current regulation Current regulation Iout TSM1013 Vcc : On power output Primary current regulation 4 COMPENSATION 5/8 TSM1013 START UP AND SHORT CIRCUIT CONDITIONS sufficient supply for the TSM1013 has to be ensured under any condition. It would then be necessary to add some circuitry to supply the chip with a separate power line. This can be achieved in numerous ways, including an additional winding on the transformer. The voltage-control trans-conductance operational amplifier can be fully compensated. Both of its output and negative input are directly accessible for external compensation components. An example of a suitable compensation network is shown in Fig.2. It consists of a capacitor Cvc1=2.2nF and a resistor Rcv1=22K in series. The current-control trans-conductance operational amplifier can be fully compensated. Both of its output and negative input are directly accessible for external compensation components. An example of a suitable compensation network is shown in Fig.2. It consists of a capacitor Cic1=2.2nF and a resistor Ric1=22K in series. 6 VOLTAGE CLAMP The following schematic shows how to realise a low-cost power supply for the TSM1013 (with no additional windings).Please pay attention to the fact that in the particular case presented here, this low-cost power supply can reach voltages as high as twice the voltage of the regulated line. Since the Absolute Maximum Rating of the TSM1013 supply voltage is 28V. In the aim to protect he TSM1013 against such how voltage values a internal zener clamp is integrated. Rlimit = (Vcc-Vz)Ivz Fig. 4: Clamp voltage 5 START UP AND SHORT CIRCUIT CONDITIONS Under start-up or short-circuit conditions the TSM1013 is not provided with a high enough supply voltage. This is due to the fact that the chip has its power supply line in common with the power supply line of the system. Therefore, the current limitation can only be ensured by the primary PWM module, which should be chosen accordingly. If the primary current limitation is considered not to be precise enough for the application, then a Fig. 5: Vcc cc Rlimit Ivz TSM1013 28V Vcc Vz Rlimit D To primary OUT+ 1 DS Vcc Vref 28V R3 100 CV CV Out 8 R2 IL 5 4 + 7 Rvc1 22K Cvc1 2.2nF R1 Load Cic1 2.2nF OUT- R4 100K TSM1013 Cc+ CC Cv- 3 CC Out CS + + Cc- Gnd 2 6 Ric1 22K R5 Vsense 10K Rsense IL Ric2 1K 6/8 PACKAGE MECHANICAL DATA 7 PACKAGE MECHANICAL DATA TSM1013 SO-8 MECHANICAL DATA DIM. A A1 A2 B C D E e H h L k ddd 0.1 5.80 0.25 0.40 mm. MIN. 1.35 0.10 1.10 0.33 0.19 4.80 3.80 1.27 6.20 0.50 1.27 0.228 0.010 0.016 TYP MAX. 1.75 0.25 1.65 0.51 0.25 5.00 4.00 MIN. 0.053 0.04 0.043 0.013 0.007 0.189 0.150 0.050 0.244 0.020 0.050 inch TYP. MAX. 0.069 0.010 0.065 0.020 0.010 0.197 0.157 8 (max.) 0.04 0016023/C 7/8 TSM1013 PACKAGE MECHANICAL DATA Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics All other names are the property of their respective owners. (c) 2003 STMicroelectronics - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Belgium - Brazil - Canada - China - Czech Repubic - Finland - France - Germany Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain Sweden - Switzerland - United Kingdom - United States http://www.st.com 8/8 |
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