TSM1014 STMICROELECTRONICS | Alldatasheet
Document overview
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Technical content
I Constant voltage and constant current control I Low consumption I Low voltage operation I Low external component count I Current sink output stage I Easy compensation I High ac mains voltage rejection I 2kV ESD protection (HBM) Voltage Reference: I Fixed output voltage reference 1.25V I 0.5% and 1% Voltage precision
DESCRIPTION
TSM1014 is a highly integrated solution for SMPS applications requiring CV (constant voltage) and CC (constant current) mode. TSM1014 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 amplifier, combined with few external resistors and the voltage reference, can be used as a current limiter.
APPLICATIONS
PIN CONNECTIONS (top view) ORDER CODES D SO-8 (Plastic Package) S MiniSO-8 (Plastic Micropackage) Cc- Gnd VccVref Cc Out 7 Cc+ Cv- Cv Out Part Number Temperature Range Package Packaging VRef (%) Marking TSM1014ID -40 to 105°C SO-8 Tube 1 M1014 TSM1014IDT Tape & Reel 1 M1014 TSM1014AID Tube 0.5 M1014A TSM1014AIDT Tape & Reel 0.5 M1014A TSM1014IST mini SO-8 Tape & Reel 1 M808 TSM1014AIST Tape & Reel 0.5 M809 TSM1014 Low Consumption Voltage and Current Controller for Battery Chargers and Adaptors
1 Pin Descriptions
The table below gives the pin descriptions for both SO8 & MiniSO8 packages.
2 Absolute Maximum Ratings
3 Operating Conditions
Name Pin # Type Function VRef 1 Analog Output Voltage Reference CC- 2 Analog Input Input pin of the operational amplifier CC+ 3 Analog Input Input pin of the operational amplifier CV- 4 Analog Input Input pin of the operational amplifier CVOUT 5 Analog Output Output of the operational amplifier Gnd 6 Power Supply Ground Line. 0V Reference For All Voltages CCOUT 7 Analog Output Output of the operational amplifier Vcc 8 Power Supply Power supply line. Symbol DC Supply Voltage Value Unit Vcc DC Supply Voltage (50mA =< Icc) -0.3V to Vz V Vi Input Voltage -0.3 to Vcc V PT Power dissipation W Toper Operational temperature 0 to 105 ° C Tstg Storage temperature -55 to 150 °C Tj Junction temperature 150 °C Iref Voltage reference output current 2.5 mA ESD Electrostatic Discharge 2 kV Rthja Thermal Resistance Junction to Ambient Mini SO8 package 180 °C/W Rthja Thermal Resistance Junction to Ambient SO8 package 175 °C/W Symbol Parameter Value Unit Vcc DC Supply Conditions 4.5 to Vz V Toper Operational temperature -40 to 105 °C
4 Electrical Characteristics
Tamb = 25°C 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 Reference1. 1) Test conditions: pin 2 and 6 connected to GND, pin 4 and 5 connected to 1.25V, pin 3 connected to 200mV. Vcc = 18V, no load Tmin. < Tamb < Tmax. 100 180 µA Vz Vcc clamp voltage Icc = 50mA 28 V Operator 1: Op-amp with non-inverting input connected to the internal VRef VRef+V io Input Offset Voltage + Voltage reference TSM1014 TSM1014A Tamb = 25°C Tmin. ≤ Tamb ≤ Tmax. Tamb = 25°C Tmin. ≤ Tamb ≤ Tmax. 1.251 1.25 1.266 1.279 1.258 1.267 V DV io Input Offset Voltage Drift 7 µV/°C Operator 2 Vio Input Offset Voltage TSM1014 TSM1014A Tamb = 25°C Tmin. ≤ Tamb ≤ Tmax. Tamb = 25°C Tmin. ≤ Tamb ≤ Tmax. 0.5 mV DV io Input Offset Voltage Drift 7 µV/°C Iib Input Bias Current T amb = 25°C Tmin. ≤ Tamb ≤ Tmax. 150 200 nA SVR Supply Voltage Rejection Ration V CC = 4.5V to 28V 65 100 dB Vicm Input Common Mode Voltage Range 0 Vcc-1.5 V CMR Common Mode Rejection Ratio T amb = 25°C Tmin. ≤ Tamb ≤ Tmax. 85 dB Output stage Gm Transconduction Gain. Sink Current Only2 2) The current depends on the voltage difference between 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 Gm*1mA. Tamb = 25°C Tmin. ≤ Tamb ≤ Tmax. 0.5 1 mA/mV Vol Low output voltage at 5 mA sinking cur- rent Tmin. ≤ Tamb ≤ Tmax. 250 400 mV Ios Output Short Circuit Current. Output to (Vcc-0.6V). Sink Current Only Tamb = 25°C Tmin. ≤ Tamb ≤ Tmax. 10 mA Voltage reference VRef Reference Input Voltage TSM1014 1% precision TSM1014A 0.5% precision Tamb = 25°C Tmin. ≤ Tamb ≤ Tmax. Tamb = 25°C Tmin. ≤ Tamb ≤ Tmax. 1.238 1.225 1.244 1.237 1.25 1.25 1.262 1.273 1.256 1.261 V ∆VRef Reference Input Voltage Deviation Over Temperature Range Tmin. ≤ Tamb ≤ Tmax. 20 30 mV RegLine Reference input voltage deviation over Vcc range. Iload = 1mA 20 mV RegLoad Reference input voltage deviation over output current. Vcc = 18V, 0 < Iload < 2.5mA 10 mV
Principles of Operation and Application Tips TSM1014
5 Principles of Operation and Application Tips
5.1 Voltage control
The voltage loop is controlled via a first trans-conductance 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 written in Equation 1. R1 = R2 x VRef / (Vout - VRef) Equation 1 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 100KΩ (or more) would be appropriate for the resistors R1 and R2 . As an example, with R2 = 100KΩ , Vout = 4.10V, VRef) = 1.210V, then R1 = 41.9KΩ . Note that if the low drop diode is 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 V out by (Vout + Vdrop).
5.2 Current control
The current loop is controlled via the second trans-conductance operational amplifier, the sense resistor R sense, 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: Equation 2 Equation 3 where I lim is the desired limited current, and Vsense is the threshold voltage for the current control loop. Note that the R sense resistor should be chosen taking into account the maximum dissipation (Plim) through it during full load operation. Equation 4 R sense Ilim× V sense= V sense R 5 V ref⋅ Ilim R 5 V ref R sense⋅⋅ P lim Ilim V sense×=
TSM1014 Principles of Operation and Application Tips 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-conductance 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.
5.3 Compensation
The voltage-control trans-conductance operational amplifier can be fully compensated. Both its output and negative input are directly accessible for external compensation components. An example of a suitable voltage-control compensation network is shown in Figure 2 on page 4. It consists of a capacitor Cvc1=2.2nF and a resistor Rcv1=22KΩ 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 current-control compensation network is also shown in Figure 2 on page 4. It consists of a capacitor Cic1=2.2nF and a resistor Ric1=22KΩ in series.
5.4 Start-up and short circuit conditions
Under start-up or short-circuit conditions the TSM1014 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 TSM1014 has to be ensured under all conditions. For this, it would be necessary to add some circuitry to supply the chip with a separate power line. This can be achieved in a number of ways, including putting an additional winding on the transformer. Figure 3: Output Voltage versus Output Current Vout Iout Voltage regulation Current regulation TSM1014 Vcc : independent power supply Secondary current regulation TSM1014 Vcc : On power output Primary current regulation
Principles of Operation and Application Tips TSM1014
5.5 Voltage clamp
The following schematic shows how to realize a low-cost power supply for the TSM1014 (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 against such how voltage values a internal zener clamp is integrated. Figure 4: Clamp voltage Figure 5: Voltage controller and over current detection schematic R limit V cc V z–() Ivz⋅= Vz 28V Vcc Rlimit Vcc Ivz TSM1014 D Rsense Rvc1 22K Cvc1 2.2nF Ric1 22K CV To primary OUT+ OUT- Cic1 2.2nF Load IL Ric2 10K 100K IL Vsense OCP 28V Vcc Cv- CV Out GndCc- Cc+ Vref CV CC CC Out
6 Package Mechanical Data
DIM. mm. inch A 1.35 1.75 0.053 0.069 A1 0.10 0.25 0.04 0.010 A2 1.10 1.65 0.043 0.065 B 0.33 0.51 0.013 0.020 C 0.19 0.25 0.007 0.010 D 4.80 5.00 0.189 0.197 E 3.80 4.00 0.150 0.157 e 1.27 0.050 H 5.80 6.20 0.228 0.244 h 0.25 0.50 0.010 0.020 L 0.40 1.27 0.016 0.050 k ˚ (max.) ddd 0.1 0.04 SO-8 MECHANICAL DATA 0016023/C
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7 Revision History
Date Revision Description of Changes