L6566B Просмотр технического описания (PDF) - STMicroelectronics

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L6566B

Multi-mode controller for SMPS

STMicroelectronics 

Pin settings

2

Pin settings

2.1

Connections

Figure 3. Pin connection (through top view)

HVS 1

N.C. 2

GND 3

GD 4

Vcc 5

FMOD 6

CS 7

DIS 8

16 AC_OK

15 VFF

14 SS

13 OSC

12 MODE/SC

11 ZCD

10 VREF

9 COMP

L6566B

2.2

Pin description

Table 1. Pin functions

N° Pin

Function

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-

1 HVS 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.

2

N.C.

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

requirements.

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

3 GND 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.

4

GD

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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