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A5970AD_0808 Datasheet(PDF) 10 Page - STMicroelectronics |
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A5970AD_0808 Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 17 page A5970AD 10/16 Figure 5. Current limitation circuitry 4.5 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: Table 5. Uncompensated error amplifier Note: The error amplifier output is compared with the oscillator sawtooth to perform PWM control. 4.6 PWM comparator and power stage This block compares the oscillator sawtooth and the error amplifier output signals generating the PWM signal for the driving stage. The power stage is a very critical block cause it has to guarantee a correct turn on and turn OFF of the PDMOS. The turn ON of the power element, or better, the rise time of the current at turn on, is a very critical parameter to compromise. At a first approach, it looks like the faster it is the rise time, the lower are the turn on losses. But there is a limit introduced by the recovery time of the recirculation diode. In fact when the current of the power element equals the inductor current, the diode turns off and the drain of the power is free to go high. But during its recovery time, the diode can be considered as an Tranconductance 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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