TS1051CX6RF

T S1 0 5 1 Constant Voltage and Constant Current Controller For Battery Chargers and Adaptors SOT-26 Pin Definition: 1. VCTRL 6. VCC 2. VND 5, VSENSE 3 . Ou t 4. ICTRL SOP-8 Pin Definition: 1. VCTRL 8 . VND 2. VCC 7 , Ou t 3. VSENSE 6. ICTRL 4. N.C 5. N.C General Description TS1051 is a highly integrated solution for SMPS applic ations requiring C V (cons tant voltage) and CC (cons tant current) mode. TS1051 integrated one voltage reference, tw o operational amplifiers, and a current sensing circuit. The voltage reference combined with one operational amplifier make it an ideal v oltage controller , and the other low voltage reference combined with the other operational amplifier make it an ideal current limiter for output low side current sensing. The current threshold is fixed, and precise. The only ex ternal components are: * A resis tor br idge to be connec ted 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 allow able dissipation power which need to be chosen according to the internal voltage threshold. Features ● ● ● ● ● ● ● Constant Voltage and C onstant Current Control Low Voltage Operation Precision Internal Voltage R eference Low External Component C ount Current Sink Output Stage Easy Compensation Low AC Mains Voltage Rejection Ordering Information Part No. TS1051C X6 RF TS1051C S R L Package SOT-26 SOP-8 Packi ng 3Kpcs / 7” Reel 2.5Kpcs / 13” Reel Block Diagram Application ● ● Battery Charger Adapters Pin Function Description Name VCTRL VND Ou t ICTRL VSENSE VCC 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 Voltage Output Pin. Sinking Current Only Input Pin of the Current C ontrol Loop Input Pin of the Current C ontrol Loop Position Power Supply Line 1/9 Version: B07 T S1 0 5 1 Constant Voltage and Constant Current Controller For Battery Chargers and Adaptors Absolute Maximum Rating Parameter DC Supply Voltage Input Voltage Operating Temperature Maximum Junc tion Temperature Range Thermal R esistance Junc tion to Ambient SOP-8 SOT-26 Symbol VCC VIN TOP TJ Rθja Val ue 14 -0.3 to VCC 0 to +85 150 130 250 Unit V V o o o o C C C/W C/W Operating Condition Parameter DC Supply Voltage Symbol VCC Val ue 2.5 to 12 Unit V Electrical Specifications (Ta=25 oC, VIN=5V unless otherwise noted) Parameter Total C urrent C onsumpt ion Total Supply Current – not taking the output sinking cur rent into ac c ount Voltage C ontrol Loop Trans-conduction Gain ( Vctrl) sink C urrent Only (Note 1) Voltage Control Loop Reference (Note 2) Input Bias Current ( Vctr l) Current C ontrol Loop Trans-conduction Gain (Ic trl) s ink Current only (Note 3) Current Contr ol Loop Reference, (Note 4) IOUT=2.5A, Current Out of Pin Ictrl at – 200mV Output Stage Low Output Voltage at 10mA sinking Current Output Short Circuit C urrent. Output to VCC. Sink Current Only VOL IOS --200 27 -50 mV mA GMI VSENSE IIBI 1.5 196 -7 200 25 -204 -mA/mV mV µA GM W VREF IIBV 1 1.198 -3.5 1.21 50 -1.222 -mA/mV V nA ICC -1.1 2 mA Symbol Mi n Ty p Max Unit Note: 1: If the Voltage on Vc trl ( the negative input of the amplifier) is higher than the positive amplifier input (Vref-1.21V), and it is increased by 1mV, the s inking current at the output will be increased by 3.5mA. 2: The internal Voltage reference is set at 1.21V (bandgap reference) . The voltage control loop precision takes into account the cumulative effects of the internal voltage reference dev iation as well as the input offset voltage of the trans-conduc tance operational amplifier. The internal voltage reference is fixed by bandgap, and trimmed to 0.5% accuracy at room temperature. 3: When the positiv e input at Ictrl is lower than -200mV, and the voltage is decreased by 1mV, the sinking curr ent at the output 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-conduc tion operational amplifier 2/9 Version: B07 T S1 0 5 1 Constant Voltage and Constant Current Controller For Battery Chargers and Adaptors Typical Adapter or Battery Charger Application Circuit * In the above application schematic , the TS1051 is us ed on the secondary side of a fly-back adapter (or battery charger) to provide an accurate control of voltage and current. The above feedback loop is made w ith an optocoupler. Principle of Operation and Application Hints Voltage C ontrol The voltage loop is controlled via a firs t trans-conductance operational amplifier, the resis tor bridge R 1, R2, and the optocoupler w hich is dir ectly connec ted to the output. The relation between the values of R1 & R2 should be chosen as following: *R1=R2 x Vref / ( Vout-Vref) Where Vout is the desired output voltage. To Avoid the dischar ge of the load, the r esistor bridge R1 & R2 should be highly resistive. For this ty pe of application, a total value of 100KΩ (or more) would be appropriate for the r esistors R1 & R2. As an example, with R2=100KΩ, Vout=4.10V, Vref=1.21V, then R1=41.9KΩ. Note that if the low drop diode should be inserted betw een the load and the voltage regulation resistor bridge to avoid current flow ing from the load through the resistor bridge, this drop should be taken into account into the above calculations by replac ing Vout by ( Vout + Vdrop). 3/9 Version: B07 T S1 0 5 1 Constant Voltage and Constant Current Controller For Battery Chargers and Adaptors Principle of Operation and Application Hints (continues) Current C ontrol The current loop is controlled via the second tr ans-conductance operational amplifier , the sense res istor Rs ense, and the optocoupler . The contr ol verifies as following * Rsense x llim = Vsense * Rsense = Vsense / llim Ilim is the desired limited current, Vsense is the threshold voltage for the current control loop. As an example, with llim = 1A, Vsense = -200mV, then Rsense = 200mΩ. Note that the Rsense resistor should be chosen taking into account the maximum dissipation ( Plim) through it during full load operation. * Plim = Vsense x llim As an example, with llim=1A, and Vsense=200mV, Plim=200mW. Therefore, for most adapter and battery charger applications , a quar ter-watt, or half-watt resis tor to make the current sensing function is sufficient. Vsense threshold is achieved internally by a resis tor 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 connec ted to low er potential point of the senseresistor as shown on the following figure. The resis tors of this bridge are matched to provide the best precision possible. The current siking outpits of the tw o trans-conductance operational amplifiers are common (to the outpit 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 w ith a square characteristic as shown in the following V/I output-pow er graph Output Voltage vs. Output Current 4/9 Version: B07 T S1 0 5 1 Constant Voltage and Constant Current Controller For Battery Chargers and Adaptors Principle of Operation and Application Hints (continues) 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. And example of a suitable compensation network is shown in typical application circuit. It consists o f a capacitor Cvc1=2.2nF and a resistor Rcv1=470KΩ in series, connected in parallel w ith ano ther capacitor Cvc2=22pF. The current control trans-conductance operational amplifier can be fully compensated. Both of its output and negative input are directly accessible fo r external compensation components. An example of suitable compensation ne twork is shown in typical application circuit. It consists of a capacitor Cic1=2.2nF and resistor Ric1=22KΩ in series. When the Vcc voltage reaches 12V it could be interesting to limit the current coming through the o utput in the aim to reduce the dissipation of the device and increase the stability perfo rmances of the whole application . An example of suitable Rout value could be 330Ω in series with the opto coupler in c a s e Vc c =1 2 V. Start Up and Short Circuit C ondit ions The TS1051 is not prov ided w ith a high enough supply voltage in under star t-up or short-circuit conditions. 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 cons idered not to be prec ise enough for the application, then a sufficient supply for the TS1051 has to be ensured under any condition. It would then be necessary to add some circuitry to supply the chip with separate power line. This can be achieved in numerous w ays, including an additional w inding on the transformer . The following schematic shows how to realize a low-cost power supply for the TS1051 (with no additional windings). Please pay attention to the fact that in the par ticular 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 TS1051 supply voltage is 14V, this low-cost auxiliary power supply can only be used in applications w here the regulated line voltage does not ex ceed 7V. 5/9 Version: B07 T S1 0 5 1 Constant Voltage and Constant Current Controller For Battery Chargers and Adaptors Electrical Characteristics Curve FIGURE 1 – Vref vs A mbient Temperature FIGURE 2 – Vsense vs A mbient Temperature FIGURE 3 – Vsense Input B ias Current vs. A mbient Temperat ure FIGURE 4 – Ictrl Input Bias C urrent vs. A mbient Temperat ure FIGURE 5 – Out put Short C ircuit C urrent vs. A mbient Temperat ure FIGURE 6 – Supply Current vs. A mbient Temperat ure 6/9 Version: B07 T S1 0 5 1 Constant Voltage and Constant Current Controller For Battery Chargers and Adaptors SOT-26 Mechanical Drawing DIM A A1 B C D E F G H I J SOT-26 DIME NSION MILLIMETERS INCHES MIN MIN TYP MA X TYP 0.95 BSC 1.9 BSC 2.60 1.40 2.80 1.00 0.00 0.35 0.10 0.30 5º 2.80 1.50 2.90 1.10 -0.40 0.15 --3.00 1.70 3.10 1.20 0.10 0.50 0.20 0.60 10º 0.0374 BSC MA X 0.0748 BSC 0.1024 0.1102 0.1181 0.0551 0.1101 0.0394 0.00 0.0138 0.0039 0.0118 5º 0.0157 0.0059 --0.0591 0.1142 0.0433 0.0669 0.1220 0.0472 0.0039 0.0197 0.0079 0.0236 10º Marking Diagram 51 = Device Code Y = Year Code M = Month C ode (A=Jan, B =Feb, C=Mar, D=Apl, E=May, F=Jun, G=Jul, H=Aug, I=Sep, J=Oc t, K=Nov , L=Dec) L = Lo t C ode 7/9 Version: B07 T S1 0 5 1 Constant Voltage and Constant Current Controller For Battery Chargers and Adaptors SOP-8 Mechanical Drawing DIM A B C D F G K M P R SOP-8 DIMEN SION MILLIMETER S INCH ES MIN MAX MIN MAX. 4.80 5.00 0.189 0.196 3.80 4.00 0.150 0.157 1.35 1.75 0.054 0.068 0.35 0.49 0.014 0.019 0.40 1.25 0.016 0.049 1.27BSC 0.05BSC 0.10 0.25 0.004 0.009 0º 7º 0º 7º 5.80 6.20 0.229 0.244 0.25 0.50 0.010 0.019 Marking Diagram Y = Year Code M = Month C ode (A=Jan, B =Feb, C=Mar, D=Apl, E=May, F=Jun, G=Jul, H=Aug, I=Sep, J=Oc t, K=Nov , L=Dec) L = Lo t C ode 8/9 Version: B07 T S1 0 5 1 Constant Voltage and Constant Current Controller For Battery Chargers and Adaptors Notice Specifications of the produc ts displayed herein are s ubject to change without notice. TSC or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies. Infor mation contained herein is intended to pr ovide a product description only. N o license, express or implied, to any intellectual proper ty rights is granted by this document. Except as provided in TSC’s terms and conditions of sale for such products , TSC assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and/or use of TSC products including liability or warranties relating to fitness for a par ticular purpose, merchantability, or infringement of any patent, copyright, or other intellectual proper ty right. The products shown herein are not designed for use in medical, life-saving, or life-sus taining applications . C ustomers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify TSC for any damages resulting from such improper use or sale. 9/9 Version: B07