STMicro Extends ESBT® Voltage Rating For Low-Loss SMPS Design In Three-Phase Applications
STMicroelectronics (ST) has introduced the STC03DE220HV ESBT (Emitter-Switched Bipolar Transistor) power switch, which is said to enable engineers to improve efficiency, cost, component count and size in auxiliary switched-mode power supplies for single- and three-phase applications.
The STC03DE220HV is the first in a new family of ESBTs from ST rated for 2200V breakdown voltage, allowing designers to use a single-switch flyback topology in universal-input converters operating from 90 to 690Vac. ST’s full range of ESBTs now allows designers to build quasi-resonant converters up to 250W, using a common hardware platform with a suitable controller such as the L6565.
Operating efficiently at 150kHz maximum switching frequency and 3A maximum rated current, the STC03DE220HV can be used in a wide range of auxiliary SMPS applications including industrial utility metering, inverter drives for induction motors, welding equipment and uninterruptible power supplies (UPS). Further advantages include an enhanced TO247-4L package, providing 8.9mm of creepage distance to exceed IEC664-1 specifications at the maximum working voltage of 2200V.
Using ESBT technology, the STC03DE220HV is said to best standard bipolar transistors as well as high-voltage MOSFETs by combining low on-state losses with the traditional MOSFET advantages of high switching frequency and easy gate-driver design. The STC03DE220HV achieves an equivalent on-resistance of 0.33Ω, from the collector to source, while also operating at up to 150kHz to enable small filter components. In addition the total die size is smaller than for a high-voltage MOSFET of similar rating, delivering what is described as an inherent cost saving. The ESBT’s square Safe Operating Area (SOA) is also said to simplify design and ensure rugged performance throughout a wide range of conditions.
The STC03DE220HV is in full production, and available at $3.50 in quantities over 1000 pieces.
