L6563 Ver la hoja de datos (PDF) - STMicroelectronics

Número de pieza

componentes Descripción

Fabricante

L6563

Advanced transition-mode PFC controller

STMicroelectronics 

L6563 - L6563A

Application information

An important advantage of this technique is that the overvoltage level can be set

independently of the regulated output voltage: the latter depends on the ratio of R1 to R2,

the former on the individual value of R1. Another advantage is the precision: the tolerance of

the detection current is 15%, which means 15% tolerance on the ∆VO. Since it is usually

much smaller than Vo, the tolerance on the absolute value will be proportionally reduced.

Example: VO = 400V, ∆VO = 40V.

Then: R1 = 40V/20µA = 2MΩ ; R2 = 2.5·2MΩ·/(400-2.5) = 12.58kΩ.

The tolerance on the OVP level due to the L6563/A will be 40·0.15 = 6 V, that is ± 1.36%.

When either OVP is activated the quiescent consumption is reduced to minimize the

discharge of the Vcc capacitor.

Figure 33. Output voltage setting, OVP and FFP functions: internal block diagram

Vout

{R3a

R3

R3b

{R1a

R1

R1b

R4

0.26V

+

FAULT (not latched)

PFC_OK 7

INV 1

-

+

9.5V

-

2.5V

9.5V

ITBO

+

E/A

-

-

+

TBO

FUNCTION

FAULT (latched)

2.25V

20 µA

Frequency

Compensation

R2

2

COMP

Static OVP

Dynamic OVP

L6563

L6563A

17/37

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