EVL170W-FTV STMicroelectronics, EVL170W-FTV Datasheet - Page 15

• 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

AN3329
Figure 19. Standby supply burst mode
Figure 21. Standby supply OVP at 115 Vac -
CH1: DRAIN (pin #8)
CH3: +5 V standby
CH1: DRAIN (pin #8)
CH3: CONT (pin #3)
Figure 19
operates in burst-mode, with just a few pulses per burst, minimizing switching losses and
therefore improving efficiency under light load operation, making it suitable for equipment
with low standby consumption requirements.
Figure 21
output voltage value exceeds the internal threshold set by the resistor divider connected to
the CONT pin (#3), the Viper27LN stops working, providing protection against dangerous
voltages which may damage the system. It remains latched until the V
to V
the internal current source charges the V
operation at 230 Vac - 50 Hz - 10 mA
load
60 Hz, full load
DD_RESTART
and
shows the OVP response, observed opening the Viper27LN feedback loop. If the
Figure 20
(4.5 V). At this point the auto-restart process takes place like any startup;
CH2: V
CH2: +5 V standby
CH4: FB (pin #4)
CH4: FB (pin #4)
illustrate the waveforms during light load operation. Viper27LN
DD
(pin #2)
Doc ID 18376 Rev 1
Figure 20. Standby supply burst mode
Figure 22. Standby supply OVP at 230 Vac -
DD
CH1: DRAIN (pin #8)
CH3: +5 V standby
CH1: DRAIN (pin #8)
CH3: +5 V standby
capacitor until it reaches the V
operation at 230 Vac - 50 Hz - 10 mA
load-detail
50 Hz - 0.5 A
DD
CH2: V
CH2: V
CH4: FB (pin #4)
has dropped down
Functional check
DDon
DD
DD
threshold
(pin #2)
(pin #2)
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