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TSM1013AID Datasheet(PDF) 6 Page - STMicroelectronics |
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TSM1013AID Datasheet(HTML) 6 Page - STMicroelectronics |
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6 / 8 page  TSM1013 START UP AND SHORT CIRCUIT CONDITIONS 6/8 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 Ω 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 Ω in series. 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 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. 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 Fig. 5: Vz 28V Vcc Rlimit cc Ivz TSM1013 + CS DS D R2 R1 Rsense Rvc1 22K Cvc1 2.2nF Ric1 22K OUT+ OUT- + Cic1 2.2nF IL Ric2 1K R5 10K R4 100K R3 100 IL Vsense + Rlimit Vcc 28V Vcc Cv- CV Out Gnd Cc- Cc+ Vref 1 4 5 3 7 CV CC CC Out TSM1013 |
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