EVL185W-LEDTV STMicroelectronics, EVL185W-LEDTV Datasheet - Page 13

• 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

AN3339
4
Figure 9.
CH1: DRAIN (pin #8)
CH3: CONT (pin #3)
Functional check
Standby supply
In
reported. It is based on the Viper27LN, a device integrating the controller and MOSFET in a
single DIP-7 package. The Viper27LN works with fixed switching frequency at about 60 kHz,
with frequency jittering to reduce EMI. In order to obtain a good efficiency and to reduce
transformer size the converter has been designed to operate in continuous conduction
mode at low mains
if PFC and resonant are not working.
In
value of the standby transformer leakage inductance allows limited dissipation on the
clamping network across the primary winding. In addition, the drain peak voltage is well
below the Viper27LN rating even with maximum input voltage and full load operation.
Waveforms relevant to the secondary side are represented in
reverse voltages applied to the rectifier are well below the component maximum ratings.
Standby supply waveforms
at 115 Vac - 60 Hz - full load
Figure 9
Figure 11
and
the converter waveforms are captured once the PFC is working. The small
CH4: FB (pin #4)
CH2: V
10
some waveforms of the standby supply under rated load operation are
(Figure
DD
(pin #2)
9) and discontinuous conduction mode at high mains
Doc ID 18449 Rev 1
Figure 10. Standby supply waveforms
CH1: DRAIN (pin #8)
CH3: CONT (pin #3)
at 230 Vac - 50 Hz - full load
Figure
CH4: FB (pin #4)
CH2: V
12: the maximum
DD
Functional check
(pin #2)
(Figure
13/43
10)