L6599AD datasheet(7/35 Pages) STMICROELECTRONICS

7 / 35 page

L6599A

Pin connection

Doc ID 15308 Rev 7

7/35

9PFC_STOP

Open-drain ON/OFF control of PFC controller. This pin, normally open, is

intended for stopping the PFC controller, for protection purposes or during

burst mode operation. It goes low when the IC is shut down by DIS>1.85 V,

ISEN > 1.5 V, LINE > 6 V and STBY < 1.24 V. The pin is pulled low also

when the voltage on the DELAY exceeds 2 V and goes back open as the

voltage falls below 0.3 V. During UVLO, it is open. Leave the pin

unconnected if not used.

GND

Chip ground. Current return for both the low-side gate-drive current and

the bias current of the IC. All of the ground connections of the bias

components should be tied to a track going to this pin and kept separate

from any pulsed current return.

LVG

Low-side gate-drive output. The driver is capable of 0.3 A min. source and

0.8 A min. sink peak current to drive the lower MOSFET of the half bridge

leg. The pin is actively pulled to GND during UVLO.

Vcc

Supply voltage of both the signal part of the IC and the low-side gate

driver. Sometimes a small bypass capacitor (0.1 µF typ.) to GND may be

useful to get a clean bias voltage for the signal part of the IC.

N.C.

High-voltage spacer. The pin is not internally connected to isolate the high-

voltage pin and ease compliance with safety regulations (creepage

distance) on the PCB.

OUT

High-side gate-drive floating ground. Current return for the high-side gate-

drive current. Layout carefully the connection of this pin to avoid too large

spikes below ground.

HVG

High-side floating gate-drive output. The driver is capable of 0.3 A min.

source and 0.8 A min. sink peak current to drive the upper MOSFET of the

half bridge leg. A resistor internally connected to pin 14 (OUT) ensures

that the pin is not floating during UVLO.

VBOOT

High-side gate-drive floating supply voltage. The bootstrap capacitor

connected between this pin and pin 14 (OUT) is fed by an internal

synchronous bootstrap diode driven in-phase with the low-side gate drive.

This patented structure replaces the normally used external diode.

Table 2.

Pin description (continued)

Pin N#

Type

Function

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