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L5973AD Datasheet(PDF) 10 Page - STMicroelectronics

Part # L5973AD
Description  2A switch step down switching regulator
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L5973AD Datasheet(HTML) 10 Page - STMicroelectronics

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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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