Mitsubishi PM75CLS120 | Integrated 1200V IPM for High-Reliability Motor Drives
The Mitsubishi PM75CLS120 is an L1-Series Intelligent Power Module (IPM) engineered to streamline the design and enhance the reliability of mid-power motor control systems. By integrating a three-phase converter, a three-phase inverter, and a brake chopper circuit into a single, optimized package, this module addresses the core challenges of system complexity, size, and thermal management. It is a workhorse solution for engineers developing robust and efficient power conversion applications.
Key Features and Engineering Advantages
- High Level of Integration (CIB): Combines a full converter bridge, a three-phase IGBT inverter, and a brake chopper. This significantly reduces the bill of materials (BOM), simplifies PCB layout, and minimizes assembly time and potential points of failure.
- Optimized for Low Conduction Loss: Utilizes Mitsubishi's advanced CSTBT™ (Carrier Stored Trench-gate Bipolar Transistor) technology to achieve a low VCE(sat), directly translating to lower power dissipation and improved overall system efficiency.
- Built-in Protection and Gate Drive: Integrates gate drive circuitry along with critical protection functions, including short-circuit (SC), over-temperature (OT), and under-voltage (UV) lockout. This simplifies the external control interface and provides a robust safety net for the power stage.
- Superior Thermal Performance: The module's isolated baseplate allows for efficient heat transfer to a heatsink, a crucial factor for reliability in demanding industrial environments.
Technical Deep Dive: CSTBT™ and CIB Topology
The performance of the PM75CLS120 is rooted in two core Mitsubishi Electric technologies. First is the Mitsubishi CSTBT™ structure. Unlike conventional trench IGBTs, this design incorporates an n-type carrier-stored layer which enhances conductivity modulation. For the design engineer, this means achieving an exceptionally low collector-emitter saturation voltage (VCE(sat)) without drastically compromising switching speed. This balance is critical for reducing steady-state losses in motor drive applications, which often operate at variable speeds and loads.
Second, the Converter-Inverter-Brake (CIB) topology provides immense strategic value. By co-packaging these three distinct power stages, the module eliminates the need for multiple discrete components and the complex busbar connections between them. This not only shrinks the final product footprint but also reduces parasitic inductance, a common source of voltage overshoots and EMI challenges. Understanding the risks of component failure is key, and this integrated design provides a pre-validated, reliable core for your power system. For more on this, see our guide on preventing common IGBT failures.
Optimized Application Performance
The Mitsubishi PM75CLS120 is not a generic power switch; it is purpose-built for specific, demanding applications:
- General-Purpose Inverters & VFDs: In industrial automation, reliability is paramount. The module's integrated protection and robust thermal design ensure long operational life in factory environments, driving everything from conveyor belts to pumps with high efficiency.
- AC Servo Drives: The inclusion of the brake chopper circuit is essential for applications requiring rapid deceleration and precise positioning, such as robotics and CNC machinery. This allows regenerative energy from the motor to be safely dissipated, ensuring stable control. Learn more about the role of IGBTs in robotic servo drives.
- Uninterruptible Power Supplies (UPS): The CIB configuration provides a complete AC-DC-AC conversion path in one component, making it ideal for designing compact and power-dense online UPS systems that protect critical infrastructure.
Key Technical Specifications
This table provides a snapshot of the essential performance parameters for the Mitsubishi PM75CLS120. For comprehensive data, including characteristic curves and thermal information, refer to the official product datasheet.
| Parameter | Value |
|---|---|
| Collector-Emitter Voltage (Vces) | 1200 V |
| Collector Current (Ic) | 75 A |
| Collector-Emitter Saturation Voltage (VCE(sat)) (Typ.) | 1.75 V (Inverter Part) |
| Power Dissipation (Pc) | 480 W (Inverter Part) |
| Configuration | 3-Phase Diode Rectifier + 3-Phase IGBT Inverter + Brake Chopper |
| Isolation Voltage (Viso) | 2500 Vrms (1 min) |
For detailed specifications and application notes, please contact our technical team for the official PM75CLS120 datasheet.
Frequently Asked Questions (FAQ)
What is the primary benefit of the integrated brake chopper in the PM75CLS120?
The integrated brake chopper provides a controlled path to dissipate regenerative energy generated by a motor during deceleration. This prevents the DC bus voltage from rising to dangerous levels, protecting the inverter and other components. In applications like elevators, cranes, and high-inertia servo drives, this feature is not just beneficial—it's critical for safe and stable operation.
How does the integrated gate driver simplify the design process?
An external gate drive circuit requires careful design to manage signal integrity, provide sufficient current, and implement protection logic. The integrated driver in the Mitsubishi PM75CLS120 handles these complexities internally. It is optimized for the specific IGBT chips within the module, ensuring correct turn-on/turn-off characteristics and providing reliable short-circuit and over-temperature protection with minimal external components, accelerating your design-to-market timeline.
