L6563A datasheet(31/39 Pages) STMICROELECTRONICS

31 / 39 page

L6563 - L6563A

Application information

31/39

IC shutdown upon brownout can be easily realized as shown in Figure 46 The scheme on

the left is of general use, the one on the right can be used if the bias levels of the multiplier

and the RFF·CFF time constant are compatible with the specified brownout level and with the

specified holdup time respectively.

In Table 6 it is possible to find a summary of all of the above mentioned working conditions

that cause the device to stop operating.

Figure 46. Brownout protection (master PFC)

6.8

Summary of L6563/A idle states

RUN

AC mains

L6563

L6563A

VFF

L6563

L6563A

RUN

RFF

CFF

Table 6. Summary of L6563/A idle states

Condition

Caused or

revealed by

PWM_LATCH

(pin 8)

PWM_STOP

(pin 9)

Typical IC

consumption

IC behavior

UVLO

Vcc < 8.7 V

Open

50 µA

Auto-restart

Feedback

disconnected

PFC_OK > 2.5 V

Active (high)

Open

180 µA

Latched

Saturated

Boost Inductor

Vcs > 1.7 V

(L6563 only)

Active (high)

(L6563 only)

Open

180 µA

(L6563 only)

Latched

(L6563 only)

AC Brownout

RUN < 0.52 V

Open

Active (low)

1.5 mA

Auto-restart

Standby

PFC_OK < 0.2 V

Open

1.5 mA

Auto-restart

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