Mitsubishi PSS20S51F6 | Streamlining Low-Power Motor Control with Integrated Intelligence
The Mitsubishi PSS20S51F6 is an advanced 6th generation DIPIPM™ (Dual-In-Line Package Intelligent Power Module) engineered to simplify and enhance the reliability of low-power three-phase motor drive systems. Rated for 20A and 300V, this module consolidates the power stage, gate drive logic, and critical protection circuits into a single, compact package. It is specifically designed for engineers developing cost-sensitive, high-efficiency applications where board space and design time are at a premium.
Core Advantages at a Glance
- High-Level Integration: Combines a 3-phase IGBT inverter bridge with optimized High-Voltage ICs (HVICs) and bootstrap diodes, drastically reducing external component count.
- Robust System Protection: Features built-in protection for short-circuit (SC), control supply under-voltage (UV), and over-temperature (OT), providing a fail-safe power core.
- Simplified Drive Interface: The logic interface is compatible with 3.3V and 5V CMOS/TTL signals, allowing direct connection to most microcontrollers without additional level-shifting hardware.
- Reliable Fault Feedback: An integrated fault signal (Fo) output pin provides clear, real-time diagnostic information to the system controller, enabling intelligent fault handling.
Technical Deep Dive: The DIPIPM™ Advantage
The true value of the PSS20S51F6 lies in its intelligent integration, which addresses common challenges in power electronics design. Unlike discrete solutions that require separate gate drivers, bootstrap components, and protection logic, this Mitsubishi DIPIPM™ provides a holistic, factory-optimized system.
The on-board HVIC is precisely matched to the characteristics of the internal IGBTs, ensuring optimal switching performance while minimizing gate ringing and parasitic turn-on. Furthermore, the integrated bootstrap diodes include current-limiting resistors. This thoughtful addition simplifies the high-side gate power supply design, a task that often complicates PCB layout and requires careful component selection. The result is a more compact, electromagnetically quieter, and inherently more reliable power stage that significantly shortens the development cycle.
Application Focus: Where the PSS20S51F6 Excels
The PSS20S51F6 is the ideal power core for inverterized applications up to approximately 0.75kW. Its feature set provides tangible benefits in several key areas:
- Home Appliances: In inverter-driven air conditioners, washing machines, and refrigerator compressors, the module's high integration level reduces PCB footprint, lowers assembly costs, and its robust protection ensures long-term operational reliability—a critical factor in the consumer goods market.
- Light Industrial Automation: For small Variable Frequency Drives (VFDs) controlling fans, pumps, and conveyors, the PSS20S51F6 simplifies the design process, allowing engineers to focus on control algorithms rather than wrestling with complex gate drive design.
- General-Purpose Low-Power Inverters: The module's comprehensive protection and simple interface make it a versatile building block for a wide range of motion control projects where efficiency and dependability are paramount.
Key Technical Specifications
The following table outlines the critical parameters for the Mitsubishi PSS20S51F6. For a complete dataset and application notes, please download the official datasheet.
| Parameter | Value |
|---|---|
| Collector-Emitter Voltage (Vces) | 300 V |
| Collector Current (Ic) | 20 A |
| Collector Power Dissipation (Pc) | 32.8 W |
| Control Supply Voltage (Vcc) | 13.5 ~ 16.5 V (15V typ.) |
| Control Input Interface | 3.3V, 5V CMOS/TTL Compatible |
| Isolation Voltage (Viso) | 1500 Vrms (1 minute) |
| Integrated Protections | Short-Circuit (SC), Under-Voltage (UV), Over-Temperature (OT) |
Frequently Asked Questions (FAQ)
Q1: How does the integrated short-circuit (SC) protection work?
The PSS20S51F6 monitors the desaturation voltage of the six output IGBTs. If a short-circuit event causes the Vce voltage to rise above a predefined threshold while the IGBT is commanded ON, the internal HVIC immediately initiates a soft turn-off of the affected IGBT and asserts the Fault (Fo) pin LOW. This prevents catastrophic failure from excessive current.
Q2: What is the primary benefit of the single power supply configuration?
The module uses an internal bootstrap circuit to generate the floating high-side gate drive voltages for the U, V, and W phases from the main 15V Vcc supply. This eliminates the need for three separate, isolated power supplies, dramatically reducing system cost, complexity, and board space.
For detailed design support or to discuss how the Mitsubishi PSS20S51F6 can fit into your next power conversion project, please contact our technical team for expert guidance and competitive sourcing.
