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R5972D Datasheet(PDF) 10 Page - STMicroelectronics |
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R5972D Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 35 page Functional description R5972D 10/35 DocID026873 Rev 1 Figure 4. Current limitation circuitry 5.4 Error amplifier The voltage error amplifier is the core of the loop regulation. It is a transconductance operational amplifier whose non inverting input is connected to the internal voltage reference (1.235 V), while the inverting input (FB) is connected to the external divider or directly to the output voltage. The output (COMP) is connected to the external compensation network. The uncompensated error amplifier has the following characteristics: The error amplifier output is compared to the oscillator sawtooth to perform PWM control. 5.5 PWM comparator and power stage This block compares the oscillator sawtooth and the error amplifier output signals to generate the PWM signal for the driving stage. The power stage is a highly critical block, as it functions to guarantee a correct turn ON and turn OFF of the PDMOS. The turn ON of the power element, or more accurately, the rise time of the current at turn ON, is a very critical parameter. At a first approach, it appears that the faster the rise time, the lower the turn ON losses. However, there is a limit introduced by the recovery time of the recirculation diode. In fact, when the current of the power element is equal to the inductor current, the diode turns OFF and the drain of the power is able to go high. But during its recovery time, the Table 5. Uncompensated error amplifier characteristics Description Values Transconductance 2300 µS Low frequency gain 65 dB Minimum sink/source voltage 1500 µA/300 µA Output voltage swing 0.4 V/3.65 V Input bias current 2.5 µA |
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