L6591 datasheet(4/32 Pages) STMICROELECTRONICS

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Pin settings

L6591

4/32

Pin settings

2.1

Connection

Figure 3.

Pin connection (top view)

2.2

Functions

VREF

OSC

LINE

ISEN

COMP

DIS

PFC_STOP

HVSTART

BOOT

GND

LVG

Vcc

HVG

FGND

N.C.

Table 1.

Pin functions

Pin N.

Name

Function

1LINE

Line sensing input. The pin is to be connected to the high-voltage input bus

with a resistor divider. A voltage below 1.25 V shuts down the IC, lowers its

consumption and discharges the soft-start capacitor. IC’s operation is re-

enabled as the voltage exceeds 1.25 V. The comparator is provided with

current hysteresis: an internal 15 µA current generator is ON as long as the

voltage applied at the pin is below 1.25 V and is OFF if this value is

exceeded. Bypass the pin with a capacitor to GND (#11) to reduce noise

pick-up. The pin is intended for either power-on sequencing in systems with

PFC, or brownout protection. Tie to Vcc (#9) with a 220 to 330 kW resistor if

the function is not used.

2DIS

Latched device shutdown. Internally the pin connects a comparator that,

when the voltage on the pin exceeds 4.5 V, shuts the IC down and brings its

consumption to a value barely higher than before start-up. The information

is latched and it is necessary to recycle the input power to restart the IC: the

latch is removed as the voltage on the Vcc pin (#9) goes below the UVLO

threshold. Connect the pin to GND (#11) if the function is not used.

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