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VIPER53 Datasheet(PDF) 17 Page - STMicroelectronics |
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VIPER53 Datasheet(HTML) 17 Page - STMicroelectronics |
17 / 24 page VIPer53DIP / VIPer53SP 17/24 introducing a zero and ensuring a correct phase margin. This configuration is illustrated in figure 18 for the schematic and figure 19 for the error amplifier transfer function for a typical set of values for CCOMP and RCOMP. Note that a capacitor of 10 nF (minimum value: 8 nF) should always be connected to the COMP pin to insure a correct stability of the internal error amplifier. The complete converter open loop transfer function can be built from both power cell and error amplifier transfer functions. A theoretical example can be seen in figure 20 for a discontinuous mode flyback loaded by a simple resistor, regulated from primary side (no optocoupler, the internal error amplifier is fully used for regulation). A typical schematic corresponding to this situation can be seen on figure 14. The transfer function of the power cell is represented as G(s) in figure 20. It exhibits a pole which depends on the output load and on the output capacitor value. As the load of a converter may change, two curves are shown for two different values of output resistance value, RL1 and RL2. A zero at higher frequency values then appears, due to the output capacitor ESR. Note that the overall transfer function doesn’t depend on the input voltage, thanks to the current mode control. The error amplifier has a fixed behavior, similar to the one shown in figure 19. Its bandwidth is limited, in order to avoid injection of high frequency noise Figure 19: Typical Transfer Functions Frequency (Hz) 1 10 100 1k 10k 100k 1M Gain (dB) -10 0 10 20 30 40 50 60 Rcomp=4.7k Ccomp=470nF Frequency (Hz) Phase (°) 1 10 100 1k 10k 100k 1M -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 Rcomp=4.7k Ccomp=470nF |
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