SO16N datasheet(34/51 Pages) STMICROELECTRONICS

34 / 51 page

Application information

L6566BH

34/51

Doc ID 16610 Rev 2

is allowed to reach 2 Vbe over 5 V, the L6566BH is latched off. See

Section 5.9: Latched

disable function for more details on IC behavior under these conditions. If the impedance

externally connected to pin 15 is so low that the 5+2 VBE threshold cannot be reached or if

some means is provided to prevent that, the device is able to restart after the Vcc has

dropped below 5 V. Refer to

Section 6: Application examples and ideas (Table 7) for

additional information.

Figure 22.

OVP function: internal block diagram

The ZCD pin is connected to the auxiliary winding through a resistor divider RZ1, RZ2 (see

Figure 8). The divider ratio kOVP = RZ2 / (RZ1 + RZ2) is chosen equal to:

Equation 13

where VoutOVP is the output voltage value that is to activate the protection, Ns the turn

number of the secondary winding, and Naux the turn number of the auxiliary winding.

AM11498v1

Fault

2-bit

counter

R Q1

Monostable

STROBE

OVP

COUT

2 µs

0.5 µs

Monostable

5 V

ZCD

Counter

reset

40kW

5pF

PWM latch

to triggering

block

L6566BH

Naux

Vout

OVP

OVP =

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