DF04M View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

DF04M

OFFLINE FLYBACK CONVERTERS DESIGN METHODOLOGY WITH THE L6590 FAMILY

STMicroelectronics 

Figure 8. Brownout protection circuit and timing diagram

AN1262 APPLICATION NOTE

Vin

Vin

Vcc

VinOK

R1

50 µA

Vcc

+

VinOK

6.4 V

-

R2

2.5 V

L6590A

PWM

L6590D

Vout

VPKmin

VinON

Vinmin

VinOFF

15 CONTROL LOOP DESIGN

The control loop can be summarized as shown in figure 9, where each block is described by its transfer function

in the complex frequency domain represented by means of a Bode plot.

Figure 9. Control loop Block Diagram

Vin

G1(jω)

G2(jω)

Vref

+

COMPENSATED

VCOMP

D

PWM MODULATOR

POWER STAGE

Vo

ERROR AMPLIFIER

-

OUTPUT

DIVIDER

The set PWM modulator + Power stage is what, in control theory terminology, is called the "plant", while the

compensated error amplifier is the "controller".

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