EVL250W-ATX80PL STMicroelectronics, EVL250W-ATX80PL Datasheet - Page 17

• 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

AN3203
3
3.1
3.2
Complete system
Overvoltage protection
Every output is protected against overvoltage. The +12 V, +5 V and +3.3 V are monitored on
the auxiliary power supply schematic page. They use three Zener diodes to fix the three
overvoltage thresholds. In case one of the three voltages exceeds its threshold the latch
realized with Q604 and Q605 is turned on and the VCC for the L6591 and L6563S is
removed.
The two outputs +5 V and +3.3 V also have an overvoltage protection integrated into the
L6727 controller.
The +5 V_SB output is protected using the OVP protection of the VIPer27H that senses its
output voltage through the auxiliary winding. A threshold on the CONT pin detects the OVP
condition and stops the IC operation. This protection has an auto-restart behavior.
Load transients
The following figures show the behavior of the outputs during load transients. Each image
shows the transition from 20 % to 100 % of rated current and vice versa for a single output
voltage. The current slope is 0.5 A/µs for all the current variations.
Figure 11. Load transient on +12 V output
Doc ID 17402 Rev 1
Complete system
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