TPS-GSH180S Series Open-Frame Power Supply (180W): Wide 85–264Vac / 120–370Vdc Input, Active PFC, up to 4000Vac Isolation — Buying Guide for Integrators

What TPS-GSH180S Is (and What “Open Frame” Means)

The TPS-GSH180S Series is an open-frame AC/DC power supply, meaning the PCB and components are exposed and intended for integration into a larger system.

In practical applications, an enclosure or protective cover is typically added to:

• Provide touch protection

• Support controlled airflow

• Establish a defined EMC and grounding environment

Open-frame designs are commonly used in:

• Machine controllers

• Industrial HMIs

• Communication gateways

They offer:

• Compact dimensions

• Flexible mounting options

• Efficient thermal coupling

However, system-level design (airflow, mounting, grounding) determines whether operation remains within safe limits—especially when approaching higher power levels.

SKU Selection: Matching Voltage to Application

The TPS-GSH180S series covers common industrial DC voltage rails:

• 12V – Embedded systems, sensors, legacy rails

• 24V – Standard industrial control systems (PLC, I/O, relays)

• 24V + Baseplate – Improved thermal spreading and mechanical stability

• 36V – Specialized industrial or communication loads

• 48V – Telecom-related systems, long cable runs, motor drivers

Selection should consider:

• Load requirements

• Cable losses

• System architecture (point-of-load vs. centralized supply)

Electrical Performance Considerations

Wide AC/DC input, PFC, inrush and low-line derating

Wide Input Range and PFC

The unit supports 85–264Vac and 120–370Vdc input, enabling use across different global supply conditions.

Active PFC is included, with typical performance indicating high power factor at nominal load.

System-level note:
Inrush current is specified as a cold-start peak. In multi-PSU systems, sequencing or inrush limiting (e.g., NTC or active solutions) may be required.

Low-Line Derating

At lower input voltages, available output power is reduced.

This means:

• Operation at low-line conditions requires derating

• Power supply selection should consider worst-case input scenarios

Output Regulation, Ripple, and Adjustment

The series provides a regulated single output with adjustable voltage to compensate for:

• Cable voltage drops

• System tolerances

Typical adjustment ranges include:

• 12V model: approx. 11.4–12.8V

• 24V model: approx. 22.8–27V

• 36V model: approx. 33–39V

• 48V model: approx. 45.6–54V

Ripple specifications are defined using a standard measurement setup (20 MHz bandwidth with parallel capacitors).
Using different measurement conditions may lead to higher observed ripple values.

Protection Functions

The TPS-GSH180S includes standard protection mechanisms for industrial applications:

• Undervoltage protection (UVP)

• Overcurrent protection (OCP, typically hiccup mode)

• Overvoltage protection (OVP)

• Overtemperature protection (OTP)

• Short-circuit protection

These functions are designed to support predictable fault behavior and automatic recovery under defined conditions.

Thermal Strategy and Derating

Two operating conditions are typically considered:

• Natural convection (approx. 120W class)

• Fan-assisted cooling (~10 CFM) (up to 180W)

Important integration considerations:

• Internal enclosure temperature may exceed ambient

• Hotspots can form near switching components

• Airflow must be defined—not assumed

Practical design recommendations:

• Define airflow paths (intake and exhaust)

• Avoid obstructing airflow with cables

• Consider baseplate versions for improved heat spreading

• Validate performance under low-line conditions

Mechanical Integration

The unit is compact (approx. 101.6 × 50.8 × 17.8 mm), with a slightly increased height when using the baseplate variant.

Key integration features:

• LED indicator for status visibility

• Adjustable output (ADJ point)

• Defined mounting and connector layout

For production:

• Use standardized harnessing to reduce assembly errors

• Define output voltage adjustment procedures

• Consider thermal interface materials if mounting surfaces are uneven

Compliance and EMC Considerations

The datasheet references alignment with:

• IEC 62368-1 (safety standard)

• CISPR 32 / EN 55032 Class B (emissions)

• IEC/EN 61000-4 series (immunity tests)

Important:
System-level compliance depends on:

• Enclosure design

• Cable routing

• Grounding strategy

The PSU should be considered a contributing component rather than a standalone compliance solution.

Application Guidance by Voltage

• 12V – Suitable for embedded systems and legacy loads

• 24V – Common choice for industrial control systems

• 24V + Baseplate – Improved robustness in thermally demanding environments

• 36V / 48V – Useful for reducing current in higher-power or long-distance applications

RFQ Checklist

To streamline quotation and evaluation:

• Required SKU and quantity (prototype → series)

• Minimum input voltage conditions

• Cooling strategy (natural vs. forced)

• Mechanical constraints and mounting

• EMC environment and cabling

• Documentation requirements

Providing these details can help reduce clarification cycles during evaluation.

When to Consider Alternative PSU Types

Depending on your application, other form factors may be more suitable:

• DIN-rail PSUs – For standardized cabinet installations

• ATX / IPC PSUs – For PC-based or industrial computing systems

• 1U rack PSUs – For rack-mounted equipment

FAQ

Is TPS-GSH180S enclosed?
No, it is an open-frame design. In most applications, it is installed within a system enclosure.

Can it operate at 180W continuously?
This typically requires fan-assisted cooling and appropriate thermal design.

Is output voltage adjustable?
Yes, within defined ranges depending on the model.

Does it ensure EMC compliance?
It supports compliance, but final system performance depends on integration.

Which variant is commonly used?
24V is widely used in industrial control applications.