## Overview

The CUI Inc PBO-5-S12 is a compact open-frame AC-DC power supply designed for industrial and embedded applications where space is limited but reliable performance is required. It belongs to the PBO series, which emphasizes high efficiency, tight voltage regulation, and broad safety certifications. The device converts high-voltage AC input to a regulated 12V DC output, making it suitable for control systems, instrumentation, and communication equipment.

## Input Specifications

The PBO-5-S12 supports a wide input voltage range, enabling use in various global regions:

* Input Voltage: 90–264 VAC (full-range AC)
* Input Frequency: 47–63 Hz
* Input Current: 0.2 A typical at full load
* Inrush Current: Limited via internal circuitry to protect upstream components

## Output Specifications

The unit provides a single regulated DC output optimized for low ripple and high load stability:

* Output Voltage: 12 VDC nominal
* Output Current: 0.42 A maximum
* Output Power: 5 W continuous
* Ripple & Noise: Typically 120 mVp-p or less
* Load Regulation: ±5% typical
* Line Regulation: ±1% typical

## Efficiency and Thermal Performance

The PBO-5-S12 achieves relatively high efficiency for a compact open-frame design:

* Typical Efficiency: 75–80% at full load
* Operating Temperature Range: -25°C to +70°C
* Derating: Output power decreases above 50°C ambient according to the derating curve specified in the datasheet
* Thermal Protection: Built-in over-temperature protection prevents damage under abnormal conditions

## Protections and Reliability Features

CUI Inc incorporates multiple safety and reliability mechanisms into this module:

* Overcurrent Protection: Hiccup mode to prevent excessive current from damaging components
* Short-Circuit Protection: Continuous short-circuit tolerance with automatic recovery
* Overvoltage Protection: Limits output voltage in fault conditions
* Isolation: 3 kVAC isolation between input and output ensures user safety and compliance with industrial safety standards

## Mechanical and Mounting Features

The PBO-5-S12 is designed for PCB mounting with a compact footprint:

* Package Type: Open-frame, through-hole mount
* Dimensions: 1.6 × 1.0 × 1.0 inches (approximate, PCB footprint compliant)
* Weight: 15 g
* Termination: Solder pins for straightforward PCB integration

## Standards and Compliance

The module meets major international safety and EMC standards suitable for industrial and commercial deployment:

* Safety: UL60950-1 recognized, IEC/EN60950-1
* EMI/EMC: Meets FCC Part 15 Class B and CISPR 22 Class B limits
* RoHS Compliant: Yes, fully lead-free materials

## Applications

The PBO-5-S12 is ideal for applications that demand reliable low-power DC from an AC source:

* Industrial control and automation
* Communication and networking equipment
* Embedded computing systems
* Instrumentation and test equipment

## Summary

CUI Inc’s PBO-5-S12 is a highly compact, reliable AC-DC converter offering a regulated 12 VDC output at 5 W. Its combination of wide input voltage range, protection features, high efficiency, and compliance with global safety and EMC standards makes it suitable for diverse industrial and embedded applications. Its open-frame construction allows for easy PCB integration while maintaining thermal and electrical performance, positioning it as a versatile solution in low-power DC supply needs.