L6566A STMicroelectronics, L6566A Datasheet - Page 34

• Manufacturer Part Number: L6566A
• Description: IC CTRLR OVP UVLO 16SOIC
• Manufacturer: STMicroelectronics

Specifications of L6566A

• Output Isolation: Isolated
• Frequency Range: 93 ~ 107kHz
• Voltage - Input: 8 ~ 23 V
• Power (watts): 750mW
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Output Current: 800 mA
• Output Power: 750 mW
• Input Voltage: 8 V to 23 V
• Operating Temperature Range: - 40 C to + 150 C
• Mounting Style: SMD/SMT
• Duty Cycle (max): 75 %
• Universal Input Mains Range: 90÷264Vac - Frequency 45 ÷ 65 Hz
• Output Voltage: 19 V@4 A continuous operation
• Mains Harmonics: Acc. to EN61000-3-2 Class-D
• St-by Mains Consumption: Less than 0.25 W @265Vac
• Overall Efficiency: Better than 86%
• Emi: According to EN55022-Class-B
• Safety: According to EN60950
• Low Profile Design: 25 mm maximum height
• Pcb Single Layer: single side, 70 μm, CEM-1, 78x174 mm, Mixed PTH/SMT
• For Use With: 497-8834 - BOARD DEMO FOR L6563/LL6566A497-6452 - BOARD EVAL FOR L6566B497-6451 - BOARD EVAL FOR L6566B497-6450 - BOARD EVAL FOR L6566B497-6449 - BOARD EVAL FOR L6566A
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Application information
Note:
34/51
Figure 21. Soft-start pin operation under different operating conditions and settings
Vcc_PFC
(pin 6)
(pin 14)
(pin 5)
(pin 4)
COMP
(pin 9)
Vcc
GD
SS
2V
5V+2Vbe
START-UP
5V
operating, so that the converter will work intermittently, which is very safe. In case of
overload the system has a power capability lower than that at nominal load but the output
current may be quite high and overstress the output rectifier. In case of FF operation the
capability is almost unchanged and both short circuit and overload conditions are more
critical to handle.
The L6566A, regardless of the operating option selected, makes it easier to handle such
conditions: the 2 V clamp on the SS pin is removed and a second internal current generator
I
is allowed to reach 2 V
resulting behavior will be identical to that under short circuit illustrated in
page 19
See
A diode, with the anode to the SS pin and the cathode connected to the VREF pin (10) is the
simplest way to select either auto-restart mode or latch-mode behavior upon overcurrent. If
the overload disappears before the Css voltage reaches 5 V the I
turned off and the voltage gradually brought back down to 2 V. Refer to the
Application examples and ideas on page 44
hints.
If latch-mode behavior is desired also for converter’s short circuit, make sure that the supply
voltage of the device does not fall below the UVLO threshold before activating the latch.
Figure 21
different settings (latch-mode or autorestart).
Unlike other PWM controllers provided with a soft-start pin, in the L6566A grounding the SS
pin does not guarantee that the gate driver is disabled.
SS2
= I
Section 5.9: Latched disable function on page 32
SS1
OPERATION
; in the latter case the result will be identical to that of
NORMAL
shows soft-start pin behavior under different operating conditions and with
/4 keeps on charging Css. As the voltage reaches 5 V the device is disabled, if it
TEMPORARY
OVERLOAD
BE
over 5 V, the device will be latched off. In the former case the
OPERATION
NORMAL
section (
OVERLOAD
Vcc falls below UVLO
before latching off
here the IC
shuts down
Figure 7 on page 45
for additional details.
Figure 20 on page 33
SS2
SHUTDOWN
generator will be
AUTORESTART
here the IC
latches off
LATCHED
Figure 6 on
) for additional
Section 6:
RESTART
L6566A
.
UVLO
t
t
t
t
t