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A5975AD 데이터시트(PDF) 15 Page - STMicroelectronics

부품명 A5975AD
상세설명  Voltage feed-forward
PDF  50 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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A5975AD 데이터시트(HTML) 15 Page - STMicroelectronics

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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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