Full bridge 600V/3.5A system-in-package saves space

November 06, 2018 // By Nick Flaherty
STMicroelectronics has launched the second in a series of system-in-package devices aimed at high voltage brushed DC and single phase brushless motor applications.

The PWD5F60 integrates a 600V/3.5A single-phase MOSFET bridge with gate drivers, bootstrap diodes, protection features, and two comparators in a 15mm x 7mm outline. The thermally efficient system-in-package occupies 60% less board real-estate than discrete components and simplifies design and assembly

As a single-phase full-bridge module, the PWD5F60 is aimed at driving brushed DC motors in applications such as industrial pumps and fans, blowers, domestic appliances, and factory-automation systems. It is particularly targeted at the appliances using single-phase brushless motors that guarantee high durability and efficiency at a reasonable cost. It is also cost-effective and convenient for use in power supply units.

The on-resistance of 1.38Ω for the integrated N-channel MOSFETs provides high efficiency for handling medium-power loads and the gate drivers are optimised for reliable switching and low EMI (electromagnetic interference), while the integrated bootstrap diodes enable high-voltage startup with no need for external diodes and passive components to supply the high-side inputs.

The SIP provides flexibility by having two embedded uncommitted comparators for peak current control or over-current and over-temperature protection features. The peak-current control used in conjunction with positioning Hall-effect sensors allows to achieve a stand-alone controller with no need of a dedicated controller, reducing the cost of control electronics. It also includes adjustable dead-time and the option to configure the MOSFETs as a single full bridge or two half bridges to match the design requirements. Operating voltage range extends from 10V to 20V and inputs are compatible with 3.3V-15V control signals to ease interfacing with Hall sensors or a host microcontroller or DSP

Cross-conduction prevention and under-voltage lockout are already built-in to protect the device by preventing operation in low-efficiency or dangerous conditions.

The PWD5F60 is in production and available now, packaged as a multi-island VFQFPN device, from $2.15 for orders of 1000 pieces.

www.st.com/pwd

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