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L5973AD Datasheet(PDF) 10 Page - STMicroelectronics |
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L5973AD Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 21 page Functional description L5973AD 10/21 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 (1.235V), 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 with the oscillator sawtooth to perform PWM control. DRIVER NOT A1 PWM VCC OUT A1/A2=95 IL RSENSE D00IN1134 IOFF I I RTH A2 Table 5. Uncompensated error amplifier Transconductance 2300 µS Low frequency gain 65dB Minimum sink/source voltage 1500 µA/300µA Output voltage swing 0.4V/3.65V Input bias current 2.5 µA |
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