EVL250W-ATX80PL STMicroelectronics, EVL250W-ATX80PL Datasheet - Page 16

• Manufacturer Part Number: EVL250W-ATX80PL
• Description: BOARD DEMO SMPS L6591/L6563S
• Manufacturer: STMicroelectronics
• Series: VIPer™ plusr

Specifications of EVL250W-ATX80PL

• Main Purpose: Power Supply, ATX
• Outputs And Type: 3, Isolated
• Power - Output: 250W
• Voltage - Output: 12V, 5V, 3.3V
• Current - Output: 13.5A, 12A, 8A
• Voltage - Input: 88 ~ 264VAC
• Regulator Topology: Flyback
• Frequency - Switching: 80kHz
• Board Type: Fully Populated
• Utilized Ic / Part: L6563S, L6591, L6727, VIPer27H
• Input Voltage: 88 VAC to 264 VAC
• Output Voltage: 3.3 V, 5 V, 12 V
• Maximum Operating Temperature: + 60 C
• Operating Supply Voltage: 80 VAC to 264 VAC
• Output Power: 250 W
• Product: Power Management Development Tools
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: L6563S PFC controller
• Other names: 497-10596

Asymmetrical half bridge operation
2.2
16/45
Short-circuit protection
In case of a short-circuit at the AHB output the overload protection (OLP) is activated.
Figure 10
COMP pin saturates high. The IC detects this condition and starts charging the SS
capacitor. When the SS voltage reaches 5 V the system is shut down, when it reaches 6.4 V
the IC is latched. The PFC controller is also stopped: when the L6591 activates the
protection, the PFC_STOP signal pulls the L6563S RUN pin down to below the 0.8V
threshold. The latch is kept thanks to the auxiliary stage that remains active and provides
the VCC voltage.
In order to restart the system it is necessary to recycle the L6591 VCC voltage between the
UVLO thresholds. This can be done by removing the PS_ON signal in the auxiliary stage.
Figure 10. Short-circuit behavior detail
Ch1: SS pin voltage (yellow)
Ch2: COMP pin voltage (blue)
Ch3: FGND pin voltage, (purple)
Ch4: L6563S RUN pin voltage (green)
shows the pins involved in this function. When the short-circuit is applied, the
Doc ID 17402 Rev 1
AN3203