Datasheet

Functional description L5973AD
10/22 Doc ID 9552 Rev 9
Figure 6. 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:
The error amplifier output is compared with the oscillator sawtooth to perform PWM control.
DRIVER
NOT
A1
PWM
VCC
OUT
A1/A2=95
I
L
RSENSE
D00IN1134
I
OFF
II
RTH
A2
Table 5. Uncompensated error amplifier
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