1 VIPer12-based Power Supply Features and Assembly

AN2173 - APPLICATION NOTE

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1

VIPer12-based Power Supply Features and

Assembly

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Fixed 60kHz Switching Frequency

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Switch mode General Purpose Power Supply

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Burst Mode Operation in Standby for Blue Angel operation

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Current Mode Control

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Typical 75% Efficiency at Full Load

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Auxiliary Undervoltage Lockout with Hysteresis

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Output Short Circuit Protection

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Thermal Shutdown Protection

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Meets EN55022 Class B EMI specification

1.1

Layout and Component Placement

To meet Printed Circuit Board (PCB) space requirements, both sides of the PCB are used for

either low or high voltage power supply mains by selecting the appropriate voltage rating for the

bulk capacitors and the Metal Oxide Varistor (MOV). Surface-mount components should be

used wherever possible to reduce the size of the assembly. The remaining axial lead devices

(e.g., resistors, diode, and “pigtail” fuse) are mounted vertically to save PCB space.

The line and neutral pins are molded into the bottom of the case and pass through two holes in

the top of the case, and a line cord attachment is on the side opposite the line and neutral pins

(see

Figure 2 on page 5 and Figure 3 on page 5). The PCB size is determined by the overall

dimensions and the side wall thicknesses of the case (1.78in x 1.78in, with rectangular

mounting slots in each side). A 0.118in mounting hole is provided. Additional support using

0.75in PCB standoffs is recommended, with the component leads trimmed to 0.65in (max).

See

Appendix A. Schematics on page 12 and Appendix B. KIDDE VIPer12 Demo Board BOM

on page 13 for details.