A5975AD datasheet(15/50 Pages) STMICROELECTRONICS

No. de pieza	A5975AD

Descripción Electrónicos	Voltage feed-forward

PDF	50 Pages

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Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

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15 / 50 page

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

A5975AD Datasheet(PDF) 15 Page - STMicroelectronics