EVL185W-LEDTV STMicroelectronics, EVL185W-LEDTV Datasheet - Page 20

• Manufacturer Part Number: EVL185W-LEDTV
• Description: DEMO BOARD VIPER27L L6564 L6599A
• Manufacturer: STMicroelectronics
• Series: VIPER™r

Specifications of EVL185W-LEDTV

• Design Resources: EVL185W-LED BOM EVL185W-LED Schematic
• Main Purpose: Power Supply with PFC
• Outputs And Type: 4, Isolated
• Power - Output: 185W
• Voltage - Output: 130V, 24V, 12V, 5V
• Current - Output: 620mA,2A, 4A, 2A
• Voltage - Input: 90 ~ 264VAC
• Regulator Topology: -
• Frequency - Switching: -
• Board Type: Fully Populated
• Utilized Ic / Part: Viper27L, L6564, L6599A
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-11255

Functional check
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Figure 31. Resonant stage waveforms
CH1: HB voltage
CH3: LV FET gate
Resonant stage
Figure 31
operation. The selected switching frequency is about 110 kHz, in order to have a good
trade-off between transformer losses and size. The converter operates slightly below the
resonance frequency.
turned on when resonant current is flowing through their body diodes and drain-source
voltage is zero.
from noise and symmetrical ensuring proper HB driving.
In
maximum voltages applied to the rectifier are well below the components maximum ratings.
Because 12 V and 24 V outputs are obtained by center-tap secondary configuration, reverse
voltages applied to the respective rectifiers are almost twice the output voltage. On the other
hand, 130 V output is obtained by full bridge rectification and voltages across rectifiers
correspond to output voltage.
at 115 Vac - 60 Hz, full load
Figure 33
and
and
CH2: HV FET gate
CH4: C39 current
32
Figure 32
34
show some waveforms relevant to the resonant stage during steady-state
reverse voltages across output rectifiers have been captured. The
Figure 31
shows the L6599A control signals. The oscillator signal is clean
Doc ID 18449 Rev 1
shows the resonant ZVS operation: both MOSFETs are
Figure 32. Resonant stage control signals
CH1: LV FET gate
CH3: RFmin (pin #4)
at 115 Vac - 60 Hz, full load
CH2: CF (pin #3)
CH4: LINE (pin #7)
AN3339