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SO16N датащи(PDF) 19 Page - STMicroelectronics

номер детали SO16N
подробное описание детали  Multimode controller for SMPS
PDF  51 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

SO16N датащи(HTML) 19 Page - 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)
GD
(pin 4)
Vcc_OK
VccON
VccOFF
Vccrestart
Icharge
0.85 mA
Short circuit occurs here
t
t
t
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
0
25
50
75
100
125
150
Tj ( C)



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