EVL185W-LEDTV STMicroelectronics, EVL185W-LEDTV Datasheet - Page 15

• 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
Figure 15. Standby supply burst mode at
CH1: DRAIN (pin #8)
CH3: 5 V stby
In
operates in burst mode, with just a few pulses by each burst, minimizing switching losses
and obtaining a significant efficiency, under light load operation, making it suitable for
equipment with very low standby consumption requirements.
Figure
Viper27LN feedback loop. When the output voltage value exceeds the internal threshold set
by the divider connected to the CONT pin (#3), the Viper27LN stops operation providing
protection against the generation of dangerous voltages which could damage the circuitry.
The Viper27LN operation is latched until the V
V). At this point the internal current source charges the V
V
If the overvoltage condition continues, a new protection cycle takes place, until the failure
cause is removed. It is important to highlight that the Viper27LN OVP protection ensures a
stable intervention point, independent of the output load, even if the voltage sensing is done
on auxiliary winding at primary side.
230 Vac - 50 Hz, 10 mA load
DDon
Figure 15
and the Viper27LN starts again via a soft-start cycle.
17, 18, 19, and
and
CH4: FB (pin #4)
CH2: V
16
light load operation waveforms have been captured. Viper27LN
DD
20
(pin #2)
show overvoltage protection response, simulated by opening the
Doc ID 18449 Rev 1
Figure 16. Standby supply burst mode at
CH1: DRAIN (pin #8)
CH3: 5 V stby
DD
has dropped down to V
230 Vac, 10 mA load - detail
DD
capacitor until it reaches the
CH4: FB (pin #4)
CH2: V
DD_RESTART
Functional check
DD
(pin #2)
(4.5
15/43