EVL185W-LEDTV STMicroelectronics, EVL185W-LEDTV Datasheet - Page 14

• 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 11. Standby supply waveforms
Figure 13. Standby supply 5 V ripple
CH1: DRAIN (pin #8)
CH3: CONT (pin #3)
CH3: 5 V ripple voltage
In
the standby converter only. Ripple and noise measured at full load are very limited.
Figure 14
At power-on, the Viper27LN internal startup current source charges the Vcc capacitor until
voltage increases up to the turn-on threshold. At this point the Viper27LN starts operating
and the output voltage reaches the nominal value. During the converter startup the
Viper27LN internal digital fixed time-based (8.5 ms) soft-start limits the drain current which
gradually increases to the maximum value. In this way the stress on the secondary diode is
considerably reduced and transformer saturation is prevented. The brownout circuits
prevent the Viper27LN from operating if the input voltage is too low.
at 400 Vdc, full load
at 115 Vac - 60 Hz, full load
Figure 13
shows the waveforms during the startup of only the standby converter at full load.
the 5 V output voltage ripple has been captured during operation at 115 Vac of
CH4: FB (pin #4)
CH2: V
DD
(pin #2)
Doc ID 18449 Rev 1
Figure 12. Standby supply o/p rectifiers PIV
Figure 14. Standby supply startup
CH3: PIV D22
CH1: DRAIN (pin #8)
CH3: BO (pin #5)
at 400 Vdc, full load
at 115 Vac - 60 Hz, full load
CH4: PIV D18
CH4: V
CH2: 5 V stby
DD
(pin #2)
AN3339