EVL6566A-75WES4 STMicroelectronics, EVL6566A-75WES4 Datasheet - Page 11

• 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

AN2941
Main characteristics and circuit description
Overtemperature protection
Thermistor R58, connected to L6566A DIS pin (#8), provides for a thermal protection of the
flyback MOSFET (Q5). The L6563S PWM_LATCH pin (activated in case of PFC loop
failures or PFC inductor saturation) is connected to L6566A DIS pin too. In case of PFC
latching failure, the flyback converter activity is latched too. To maintain this state , an internal
circuitry of the L6566A monitors the V
and periodically reactivates the HV current source
CC
to supply the IC, while the L6563S remains inactive after latching because it is no longer
powered via the Vcc_PFC pin that has been opened by the internal L6566A logic.
Standby power savings
The L6566A implements a current mode control, thus it monitors the output power by pin
COMP whose level is proportional to the load. Thus, when the voltage on pin COMP falls
below an internal threshold, the controller is disabled and its consumption reduced. Normal
operation restarts as soon as the COMP voltage rises again. In this way a low consumption
burst mode operation is obtained.
On this board, because the flyback stage acts as master, it has been electrically designed to
operate over the entire mains voltage range. This solution allows turning off the PFC
controller during no-load operation, saving power. As soon as the COMP level falls below
the burst mode threshold, the L6566A stops supplying the PFC controller, disabling
VCC_PFC pin and reducing the PFC consumption to almost zero as already explained,
minimizing the overall consumption of the converter.
Doc ID 15447 Rev 3
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