L5973AD データシートの表示（PDF） - STMicroelectronics

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L5973AD

2 A switch step down switching regulator

STMicroelectronics 

Functional description

Figure 6. Current limitation circuitry

VCC

IOFF

DRIVER

RSENSE

A1

A2

OUT

A1/A2=95

I

PWM

L5973AD

RTH

IL

I NOT

D00IN1134

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:

Table 5. Uncompensated error amplifier

Transconductance

Low frequency gain

Minimum sink/source voltage

Output voltage swing

Input bias current

2300 µS

65 dB

1500 µA/300 µA

0.4 V/3.65 V

2.5 µA

The error amplifier output is compared with the oscillator sawtooth to perform PWM control.

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