EVL6566A-75WES4 STMicroelectronics, EVL6566A-75WES4 Datasheet - Page 35

• Manufacturer Part Number: EVL6566A-75WES4
• Description: BOARD DEMO FOR L6563/LL6566A
• Manufacturer: STMicroelectronics
• Type: Power Factor Correctionr

Specifications of EVL6566A-75WES4

• Main Purpose: AC/DC, Primary and Secondary Side with PFC
• Outputs And Type: 1, Isolated
• Power - Output: 75W
• Voltage - Output: 19V
• Current - Output: 4A
• Voltage - Input: 90 ~ 264VAC
• Regulator Topology: Flyback
• Board Type: Fully Populated
• Utilized Ic / Part: L6563, L6566A, TSM1014
• Input Voltage: 90 V to 264 V
• Output Voltage: 19 V
• Dimensions: 78 mm x 170 mm
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Frequency - Switching: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: L6563S, L6566A
• Other names: 497-8834

L6566A
5.11
OVP block
The OVP function of the L6566A monitors the voltage on the ZCD pin (11) in MOSFET’s
OFF-time, during which the voltage generated by the auxiliary winding tracks converter’s
output voltage. If the voltage on the pin exceeds an internal 5 V reference, a comparator is
triggered, an overvoltage condition is assumed and the device is shut down. An internal
current generator is activated that sources 1 mA out of the VFF pin (15). If the VFF voltage
is allowed to reach 2 Vbe over 5 V, the L6566A will be latched off. See
disable function on page 32
impedance externally connected to pin 15 is so low that the 5+2 V
reached or if some means is provided to prevent that, the device will be able to restart after
the Vcc has dropped below 5 V. Refer to the “Application examples and Ideas” section
(
Figure 22. OVP Function: internal block diagram
Table 7 on page 45
PWM latch
R
S
Q
Q
) for additional hints.
Monostable
M1
to triggering
block
for more details on IC’s behavior under these conditions. If the
2 µs
ZCD
11
40k Ω
5pF
5 V
Monostable
M2
+
-
STROBE
0.5 µs
COUT
OVP
R Q1
S
FF
BE
Application information
threshold cannot be
L6566A
Section 5.9: Latched
counter
2-bit
Counter
reset
Fault
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