SO16N datasheet(19/51 Pages) STMICROELECTRONICS

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L6566BH

Application information

Doc ID 16610 Rev 2

19/51

Figure 7.

Timing diagram showing short-circuit behavior (SS pin clamped at 5 V)

Figure 8.

VHV rating vs. temperature

5.2

Zero-current detection and triggering block; oscillator block

The zero-current detection (ZCD) and triggering blocks switch on the external MOSFET if a

negative-going edge falling below 50 mV is applied to the input (pin 11, ZCD). To do so, the

triggering block must be previously armed by a positive-going edge exceeding 100 mV.

This feature is typically used to detect transformer demagnetization for QR operation, where

the signal for the ZCD input is obtained from the transformer’s auxiliary winding used also to

supply the L6566BH. The triggering block is blanked for TBLANK = 2.5 µs after MOSFET

AM11483v1

Vcc

(pin 5)

(pin 4)

Vcc_OK

VccON

VccOFF

Vccrestart

Icharge

0.85 mA

Short circuit occurs here

Trep

< 0.03Trep

AM11484v1

0.900

0.920

0.940

0.960

0.980

1.000

1.020

1.040

1.060

1.080

-50

-25

100

125

150

Tj ( C)

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