 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| TSM1011 CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER FOR BATTERY CHARGERS AND ADAPTORS s CONSTANT VOLTAGE AND CONSTANT s s s s CURRENT CONTROL LOW VOLTAGE OPERATION LOW EXTERNAL COMPONENT COUNT CURRENT SINK OUTPUT STAGE EASY COMPENSATION D SO8 (Plastic Package) VOLTAGE REFERENCE s FIXED OUTPUT VOLTAGE REFERENCE 2.545V s 0.5% AND 1% VOLTAGE PRECISION DESCRIPTION TSM1011 is a highly integrated solution for SMPS applications requiring CV (constant voltage) and CC (constant current) mode. TSM1011 integrates one voltage reference and two operational amplifiers (with ORed outputs common collectors). 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. APPLICATIONS D MiniSO8 (Plastic Micropackage) PIN CONNECTIONS (top view) s ADAPTERS s BATTERY CHARGERS ORDER CODE Part Number TSM1011I TSM1011AI TSM1011I TSM1011AI Temperature Range 0 0 0 0 to 105C to 105C to 105C to 105C Package Marking S D * * * * M1011 M1011A M802 M803 1 2 3 4 Vref CcCc+ CvVcc Out 8 7 Gnd 6 Cv+ 5 D = Small Outline Package (SO) - also available in Tape & Reel (DT S = Small Outline Package (MiniSO8) - also available in Tape & Reel (ST) July 2003 1/8 TSM1011 PIN DESCRIPTION SO8 & MiniSO8 Pinout Name Vref CcCc+ CvCv+ Gnd Out Vcc Pin # 1 2 3 4 5 6 7 8 Type Analog Output Analog Input Analog Input Analog Input Analog Input 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 Input pin of the operationnal amplifier Ground Line. 0V Reference For All Voltages Output of the two operational amplifier Power supply line. ABSOLUTE MAXIMUM RATINGS Symbol Vcc Vi PT Toper Tstg Tj Iref ESD Rthja Rthja DC Supply Voltage DC Supply Voltage (50mA =< Icc) Input Voltage Power dissipation Operational temperature 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 0 to 105 -55 to 150 150 10 2 180 175 Unit V V W C C C mA KV C/W C/W OPERATING CONDITIONS Symbol Vcc DC Supply Conditions Parameter Value 4.5 to Vz Unit V 2/8 TSM1011 ELECTRICAL CHARACTERISTICS Tamb = 25C and Vcc = +18V (unless otherwise specified) Symbol Parameter Test Condition Min Typ Max Unit Total Current Consumption Icc Total Supply Current, excluding current in Voltage Reference. Vcc = 18V, no load Tmin. < Tamb < Tmax. Icc = 50mA Tamb = 25C Tmin. Tamb Tmax. Tamb = 25C Tmin. Tamb Tmax. Tamb = 25C Tmin. Tamb Tmax. Tamb = 25C Tmin. Tamb Tmax. VCC = 4.5V to 28V 65 1.5 0 70 60 85 1 28 1 0.5 7 2 20 50 100 Vcc-1.5 Vcc-1.5 30 50 150 200 4 5 2 3 mA V mV Vz Vcc clamp voltage Operators Vio Input Offset Voltage TSM1011 TSM1011A DVio Iio Iib SVR Vicm Vicm CMR Input Offset Voltage Drift Input Offset Current Input Bias Current Supply Voltage Rejection Ratio V/C nA nA dB V V dB Input Common Mode Voltage Range for CV op-amp Input Common Mode Voltage Range for CC op-amp Common Mode Rejection Ratio Tamb = 25C Tmin. Tamb Tmax. Output stage Gm Transconduction Gain. Sink Current Only1) Tamb = 25C Tmin. Tamb Tmax. 1 Vol Ios Low level output voltage at 10 mA sinking current Output Short Circuit Current. Output to Vcc. Sink Current Only 3.5 2.5 200 27 mA/mV 600 50 mV mA Tamb = 25C Tmin. Tamb Tmax. Tamb = 25C 2.519 2.532 Voltage reference Vref Reference Input Voltage, Iload=1mA TSM1011 1% precision TSM1011A 0.5% precision Vref 2.545 2.545 20 2.57 2.557 30 20 10 V Reference Input Voltage Deviation Over Temperature Range Tmin. Tamb Tmax. Iload = 5mA Vcc = 18V, 0 < Iload < 10mA mV mV mV RegLine Reference input voltage deviation over Vcc range. RegLoad Reference input voltage deviation over 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 TSM1011 Figure 1 : Internal Schematic 1 Vcc Vref 28V Cv+ CV 5 8 Cv3 4 7 Cc+ CC Out Gnd Cc2 6 Figure 2 : Typical Adapter Application Using TSM1011 8 1 Vcc Vref 28V R3 100 D R2 To primary IL OUT+ 5 R4 10K Cv+ CV TSM1011 CvCc+ CC 4 + 7 Rvc1 22K Cvc1 2.2nF R1 3 Out Gnd + Cc2 6 Ric1 22K Cic1 2.2nF R5 Vsense 1K Rsense IL Ric2 1K OUT- In the above application schematic, the TSM1011 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 Load TSM1011 PRINCIPLE OF OPERATION AND APPLICATION HINTS 1. Voltage and Current Control 1.1. 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) Eq1 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). 1.2. 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 eq2 Vsense = R5*Vref/(R4+R5) Ilim = R5*Vref/(R4+R5)*Rsense eq2' 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. eq3 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 trans-connuctance 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. Figure 3 : Output voltage versus output current Vout Voltage regulation Current regulation 0 TSM1011 Vcc : independent power supply Secondary current regulation Iout TSM1011 Vcc : On power output Primary current regulation 2. Compensation 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. 5/8 TSM1011 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. 3. Start Up and Short Circuit Conditions Under start-up or short-circuit conditions the TSM1011 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 sufficient supply for the TSM1011 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. Figure 5 : 4. Voltage clamp The following schematic shows how to realise a low-cost power supply for the TSM1011 (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 TSM1011 supply voltage is 28V. In the aim to protect he TSM1011 against such how voltage values a internal zener clamp is integrated. Rlimit = (Vcc-Vz)Ivz Figure 4 : Clamp voltage Vcc Rlimit Ivz TSM1011 28V Vcc Vz Vcc Rlimit D To primary OUT+ 1 DS Vcc Vref 28V Cv+ CV TSM1011 R3 100 8 R2 IL 5 R4 10K CvCc+ CC 4 + 7 Rvc1 22K Cvc1 2.2nF R1 3 Out Gnd CS + + Cc2 6 Ric1 22K Cic1 2.2nF R5 Vsense 1K Rsense IL Ric2 1K OUT- 6/8 Load TSM1011 PACKAGE MECHANICAL DATA 8 PINS - PLASTIC MICROPACKAGE (MiniSO8) D E1 A2 A1 A c b ccc C 0,25 mm .010 inch GAGE PLANE PIN 1 IDENTIFICATION SEATING PLANE C 8 1 5 E k L 4 L1 e Millimeters Dimensions Min. A A1 A2 b c D E E1 e L L1 k aaa 0.050 0.780 0.250 0.130 2.900 4.750 2.900 0.400 0d Typ. 0.100 0.860 0.330 0.180 3.000 4.900 3.000 0.650 0.550 0.950 3d Max. 1.100 0.150 0.940 0.400 0.230 3.100 5.050 3.100 0.700 6d 0.100 Min. 0.002 0.031 0.010 0.005 0.114 0.187 0.114 0.016 0d Inches Typ. 0.004 0.034 0.013 0.007 0.118 0.193 0.118 0.026 0.022 0.037 3d Max. 0.043 0.006 0.037 0.016 0.009 0.122 0.199 0.122 0.028 6d 0.004 7/8 TSM1011 PACKAGE MECHANICAL DATA 8 PINS - PLASTIC MICROPACKAGE (SO8) Millimeters Dimensions Min. A a1 a2 a3 b b1 C c1 D E e e3 F L M S 0.1 0.65 0.35 0.19 0.25 4.8 5.8 1.27 3.81 3.8 0.4 4.0 1.27 0.6 8 (max.) 0.150 0.016 Typ. Max. 1.75 0.25 1.65 0.85 0.48 0.25 0.5 45 (typ.) 5.0 6.2 0.189 0.228 Min. 0.004 0.026 0.014 0.007 0.010 Inches Typ. Max. 0.069 0.010 0.065 0.033 0.019 0.010 0.020 0.197 0.244 0.050 0.150 0.157 0.050 0.024 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 (c) 2003 STMicroelectronics - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom http://www.st.com 8/8 |
Price & Availability of TSM1011
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |