EVL6566A-75WES4 STMicroelectronics, EVL6566A-75WES4 Datasheet - Page 33

• 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
5.10
Figure 20. Operation after latched disable activation: timing diagram
Soft-start and delayed latched shutdown upon overcurrent
At device start-up, a capacitor (Css) connected between the SS pin (14) and ground is
charged by an internal current generator, I
clamped. During this ramp, the overcurrent setpoint progressively rises from zero to the
value imposed by the voltage on the VFF pin 15, (see “
latch and voltage feedforward blocks on page 27
gradually, hence controlling the start-up inrush current. The time needed for the overcurrent
setpoint to reach its steady state value, referred to as soft-start time, is approximately:
Equation 9
During the ramp (i.e. until V
are disabled.
The soft-start pin is also invoked whenever the control voltage (COMP) saturates high,
which reveals an open-loop condition for the feedback system. This condition very often
occurs at start-up, but may be also caused by either a control loop failure or a converter
overload/short circuit. A control loop failure results in an output overvoltage that is handled
by the OVP function of the L6566A (see next section). In case of QR operation, a short
circuit causes the converter to run at a very low frequency, then with very low power
capability. This makes the self-supply system that powers the device unable to keep it
Vcc
Vcc_PFC
(pin 16)
AC_OK
(pin 6)
Vcc
(pin 8)
(pin 5)
(pin 4)
ON
Vcc
V
Vcc
Vcc
DIS
GD
HVstart
-0.5
restart
4.5V
Vin
Vth
OFF
ON
HV generator is turned on
T
SS
SS
= 2 V) all the functions that monitor the voltage on pin COMP
=
Css
I
SS
1
V
csx
Input source is removed here
V (
SS1
VFF
, from zero up to about 2 V where it is
)
”); MOSFET’s conduction time increases
=
Css
I
SS
HV generator turn-on is disabled here
1
Section 5.6: PWM comparator, PWM
⎛
⎜ ⎜
⎝
1
−
V
VFF
3
Disable latch is reset here
⎞
⎟ ⎟
⎠
Application information
Restart is quicker
t
t
t
t
t
t
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