EVL6566B-65W STMicroelectronics, EVL6566B-65W Datasheet - Page 5

• Manufacturer Part Number: EVL6566B-65W
• Description: BOARD EVAL FOR L6566B
• Manufacturer: STMicroelectronics

Specifications of EVL6566B-65W

• Main Purpose: AC/DC, Primary Side
• Outputs And Type: 1, Isolated
• Power - Output: 65W
• Voltage - Output: 12V
• Current - Output: 5.4A
• Voltage - Input: 90 ~ 265VAC
• Regulator Topology: Flyback
• Frequency - Switching: 80kHz
• Board Type: Fully Populated
• Utilized Ic / Part: L6566B
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6452

APPLICATION NOTE
Functional Check
Full load operation
In figure 3 and 4 some waveforms during steady state operation are reported. It is possible also
to note which the working switching frequency is 79 kHz.
Figure 3: EVL6566B-65W
Waveforms @115V-60Hz – Full load
CH1:
CH2:
CH3:
Stand by and No-load operation
In figures 5 and 6, some waveforms during no-load condition are captured. As visible, the L6566B
works in burst mode achieving the best efficiency. In the pictures even the Vcc value is captured. It
is shown that even in worst condition, at maximum input voltage (265Vac), the L6566B is powered
correctly with good margin with respect to its maximum turn-off threshold (8 V). This prevents from
spurious turn off that could affect the output voltage stability.
Figure 5: EVL6566B-65W
Burst mode @90V-60Hz – No load operation
CH1:
CH2:
Q101 Drain voltage
Q101 Gate voltage
VCC
Q101 Drain voltage
L6566B Vcc (pin #5)
Figure 4: EVL6566B-65W
Waveforms @230V-50Hz – Full load
CH1:
CH3:
Figure 6: EVL6566B-65W
Burst mode @265V-60Hz – No load operation
CH1:
CH2:
CH2:
Q7 Drain voltage
Q7 Gate voltage
VCC
Q101 Drain voltage
L6566B Vcc (pin #5)
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