L6566B datasheet(8/51 Pages) STMICROELECTRONICS

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Pin settings

L6566B

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Pin settings

2.1

Connections

Figure 3.

Pin connection (through top view)

2.2

Pin description

N.C.

GND

Vcc

FMOD

DIS

VFF

OSC

MODE/SC

COMP

VREF

HVS

AC_OK

ZCD

Table 1.

Pin functions

N°

Function

1HVS

High-voltage start-up. The pin, able to withstand 700 V, is to be tied directly to the

rectified mains voltage. A 1 mA internal current source charges the capacitor

connected between Vcc pin (5) and GND pin (3) until the voltage on the Vcc pin

reaches the turn-on threshold, then it is shut down. Normally, the generator is re-

enabled when the Vcc voltage falls below 5 V to ensure a low power throughput

during short circuit. Otherwise, when a latched protection is tripped the generator is

re-enabled 0.5 V below the turn-on threshold, to keep the latch supplied; or, when

the IC is turned off by pin COMP (9) pulled low the generator is active just below

the UVLO threshold to allow a faster restart.

2N.C.

Not internally connected. Provision for clearance on the PCB to meet safety

requirements.

3GND

Ground. Current return for both the signal part of the IC and the gate drive. 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.

4GD

Gate driver output. The totem pole output stage is able to drive power MOSFET’s

and IGBT’s with a peak current capability of 800 mA source/sink.

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