EVL170W-FTV STMicroelectronics, EVL170W-FTV Datasheet - Page 22

• Manufacturer Part Number: EVL170W-FTV
• Description: DEMO BOARD VIPER27 L6599A L6564
• Manufacturer: STMicroelectronics
• Series: VIPER™r

Specifications of EVL170W-FTV

• Main Purpose: Power Supply with PFC
• Outputs And Type: 2, Isolated
• Power - Output: 170W
• Voltage - Output: 24V, 12V, 5V
• Current - Output: 6A, 2A, 2A
• Voltage - Input: 90 ~ 264VAC
• Regulator Topology: Flyback
• Frequency - Switching: 130kHz
• Board Type: Fully Populated
• Utilized Ic / Part: Viper27LN, L6564, L6599A
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-11254

Functional check
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Figure 40. No load operation at 115 Vac - 60 Hz Figure 41. No load operation at 115 Vac - 60 Hz
CH1: HB voltage
Figure 39. Output rectifiers PIV waveforms
No load operation
In
only, as typically a TV SMPS never works in such conditions. As seen, PFC is working in
burst-mode, while the resonant stage is operating in continuous switching. This is possible
by connecting the standby pin to the RFmin pin and it has been done to avoid any possible
interference between the resonant stage and the TV circuitry. In
maximum operating switching frequency is measured.
CH1: D4 anode voltage
CH3: D9A anode voltage
Figure 40
and
CH4: PFC drain voltage
41
operation at no load is shown. This check has been done for reference
Doc ID 18376 Rev 1
CH1: HB voltage
CH3: Standby (pin #5)
CH2: D11 anode voltage
CH4: D9B anode voltage
- L6599A signals
Figure 41
CH2: CF (pin #3)
the half bridge
AN3329