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Littelfuse Unveils Optically Isolated MOSFET Gate Driver

Littelfuse has launched the first high-voltage optically-isolated MOSFET gate driver on the market that requires no external power supply, yet can provide fast load turn-on speeds in the order of tens of microseconds.

Littelfuse “The CPC1596 570V Load-Biased Opto-Gate Driver addresses a critical market need,” said Steve Andrezyk, Senior Product Marketing Manager at Littelfuse. “Universal AC power line applications now have a custom, higher power optically isolated solid-state relay (SSR) solution without the cost of an auxiliary power supply or additional discrete devices to meet fast start-up speed requirements.”

The problem: Standard Photovoltaic (PV) Gate Drivers simplify SSR-design by eliminating the need for auxiliary power supplies. Due to output currents in the µA-range, they get slower with larger gate charges of external MOSFETs, making it difficult to fulfill demanding fast turn-on application requirements.

The solution: The CPC1596 provides fast turn-on switch speed (typically 40µs) enabling designers to create a custom, higher power, optically isolated, DC-only or AC/DC solid-state relay (SSR) with external MOSFET(s).

To increase the switching speed, simply utilize the product’s unique load-biasing, on-board circuit. The use of load-biasing eliminates the need for an opto-gate driver auxiliary power supply.

An internal regulator circuit regulates the voltage drawn from the load supply (up to 570V) down to 12.2V for internal use. An external storage capacitor is added to enable constant voltage control for properly driving the MOSFET.

The CPC1596 570V Optically Isolated Load-Biased Gate Driver is ideal for use in a wide range of power electronics applications including:

  • Industrial controls,
  • Automatic Test Equipment (ATE),
  • HVAC controls,
  • Medical devices,
  • Internet of Things.

The CPC1596 offers these key benefits:

  • Boosts external MOSFET start-up speed by using load-biasing.
  • Eliminates the need for an opto-gate driver auxiliary power supply.
  • Supports optically isolated SSR-applications for both AC and DC.
  • Enables using higher power MOSFETs.
  • Can be controlled from a logic port.


Aishwarya Saxena

A book geek, with creative mind, an electronics degree, and zealous for writing.Creativity is the one thing in her opinion which drove her to enter into editing field. Allured towards south Indian cuisine and culture, love to discover new cultures and their customs. Relishes in discovering new music genres.

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