STEVAL-ISA035V1 STMicroelectronics, STEVAL-ISA035V1 Datasheet - Page 2

• Manufacturer Part Number: STEVAL-ISA035V1
• Description: BOARD EVAL BASED ON VIPER22A
• Manufacturer: STMicroelectronics
• Series: VIPER™r
• Type: Other Power Managementr

Specifications of STEVAL-ISA035V1

• Mfg Application Notes: VIPer12/22A-E AppNote
• Main Purpose: AC/DC, Non-Isolated
• Outputs And Type: 1, Non-Isolated
• Power - Output: 4.2W
• Voltage - Output: 12V
• Current - Output: 350mA
• Voltage - Input: 85 ~ 264VAC
• Regulator Topology: Buck
• Frequency - Switching: 60kHz
• Board Type: Fully Populated
• Utilized Ic / Part: VIPer22A
• Input Voltage: 85 V to 264 V
• Output Voltage: 12 V
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: VIPER22A-E
• Other names: 497-8215

Contents
Contents
1
2
3
2/17
Circuit operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
1.10
Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Input line rectification and line conducted filter . . . . . . . . . . . . . . . . . . . . . . 4
Start circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Inductor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Design example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Design hints and trade-off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Board layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Burst mode in no-load or very light load . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Short circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
EMI conducted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
AN2544