EVL185W-LEDTV STMicroelectronics, EVL185W-LEDTV Datasheet - Page 18

• 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
18/43
Figure 25. PFC Vds and inductor current
CH1: Q1 drain voltage
CH3: CS (pin #4)
Power factor corrector stage
Figure 25
considerably reduced due to the L6564 highly linear multiplier, along with a special
correction circuit that reduces crossover distortion of the mains current.
waveforms along a line half-period at 115 Vac. Current shaping is achieved as both CS
signal and peak inductor current are modulated according to the MULT signal, which is
proportional to the input voltage.
Figure 26
inductor current reaches zero, obtaining transition mode (TM) operation. As the input
voltage is lower than voltage across inductor, ZVS (zero voltage switching) is achieved.
Figure 27
the boost inductor resonance with the total drain capacitance, with an amplitude of twice the
inductor voltage, on the offset of input voltage. Contrary to operation at 115 Vac, the
MOSFET is turned on when there is still voltage on its drain but TM operation assures valley
switching, minimizing switching losses.
at 115 Vac - 60 Hz, full load
and
represents a detail of the signals in
and
CH2: MULT (pin #3)
CH4: L1 inductor current CH3: CS (pin #4)
26
28
show some waveforms of the PFC stage under full load operation. THD is
show PFC waveforms at full load at 230 Vac. It is possible to observe that
Doc ID 18449 Rev 1
Figure 26. PFC Vds and inductor current
CH1: Q1 drain voltage
Figure
at 115 Vac, full load - detail
25; the MOSFET is turned on as the
CH4: L1 inductor current
CH2: MULT (pin #3)
Figure 25
shows
AN3339