Datasheet

Pin settings L6591
4/41 Doc ID 14821 Rev 6
2 Pin settings
2.1 Connection
Figure 3. Pin connection (top view)
2.2 Functions
AM13254v1
VR EF
OSC
LINE
ISEN
SS
COMP
DIS
PFC_STOP
HVSTART
BOOT
GND
LVG
Vcc
HVG
FGND
N.C.
6
5
1
3
4
7
2
8
11
12
16
14
13
10
15
9
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 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 kΩ 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 startup. 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.