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TSM1051CDT Datasheet(PDF) 9 Page - STMicroelectronics |
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TSM1051CDT Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 15 page TSM1051 Application information 9/15 Figure 10. Output voltage versus output current 5.2 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 Figure 3. It consists of a capacitor Cvc1 = 2.2 nF and a resistor Rcv1 = 470 k Ω in series. The current-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 compensation network is shown in Figure 3. It consists of a capacitor Cic1 = 2.2 nF and a resistor Ric1 = 22 k Ω in series. In order to reduce the dissipation of the device (especially with VCC voltage values close to 12 V) and to increase the stability of the application it is suggested to limit the current flowing in the OUT pin of the device adding a resistor in series with the opto-coupler. An example of a suitable RLED value could be 330 Ω in series with the opto-coupler in case VCC = 12 V. 5.3 Start up and short circuit conditions Under start-up or short-circuit conditions the device 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 device 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 following schematic shows how to realize a low-cost power supply for the device (with no additional windings). Vout Iout Voltage regulation (Vcc of the device independent from output voltage) |
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