L6566A STMicroelectronics, L6566A Datasheet - Page 18

• 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
5.1
18/51
If FF operation is selected:
1.
Equation 1
2.
The L6566A is specifically designed for flyback converters operated from front-end power
factor correction (PFC) stages in applications supposed to comply with EN61000-3-2 or
JEITA-MITI regulations. Pin 6 (Vcc_PFC) provides the supply voltage to the PFC control IC.
High-voltage start-up generator
Figure 5
It is made up of a high-voltage N-channel FET, whose gate is biased by a 15 MΩ resistor,
with a temperature-compensated current generator connected to its source.
Figure 5.
FF mode from heavy to light load. The system operates exactly like a standard current
mode, at a frequency f
DCM and CCM transformer operation are possible, depending on whether the power
that it processes is greater or less than:
where Vin is the input voltage to the converter, V
regulated output voltage times the primary-to-secondary turn ratio) and Lp the
inductance of the primary winding. Pin
continuous to discontinuous operation mode of the transformer.
Burst-mode with no or very light load. This kind of operation is activated in the same
way and results in the same behavior as previously described for QR operation.
shows the internal schematic of the high-voltage start-up generator (HV generator).
High-voltage start-up generator: internal schematic
L6566A
Vcc_OK
sw
determined by the externally programmable oscillator: both
Pin
15 M
T
T
CONTROL
=
is the power level that marks the transition from
HV_EN
⎛
⎜ ⎜
⎝
Vin
GND
3
Vin
f 2
sw
+
V
V
1
R
Lp
HV
R
R
I
charge
I
HV
the reflected voltage (i.e. the
⎞
⎟ ⎟
⎠
2
5
Vcc
L6566A