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A5975AD Datasheet(PDF) 15 Page - STMicroelectronics |
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A5975AD Datasheet(HTML) 15 Page - STMicroelectronics |
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15 / 50 page  A5975AD Functional description Doc ID 018761 Rev 1 15/50 Figure 7. Current limitation circuitry 5.5 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: The error amplifier output is compared to the oscillator sawtooth to perform PWM control. 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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