Wednesday, July 24, 2024

Optically Isolated Load-Biased Gate Driver With No External Power Supply

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Ideal for industrial, building automation, IoT and other high-power electronics applications that require fast turn-on speeds

Offering high-voltage without any external power supply and fast load turn-on speeds in the order of tens of microseconds is the CPC1596 570V optically-isolated MOSFET gate driver by Littelfuse, Inc. It is ideal for power electronics applications including:

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⦁ Industrial controls,

⦁ Automatic Test Equipment (ATE)

⦁ HVAC controls

⦁ Medical devices

⦁ Internet of Things


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 fulfil demanding fast turn-on application requirements.  

Solving this is the CPC1596, which provides fast turn-on switch speed (typically 40µs) that enables designers to create custom, high power, optically isolated, DC-only or AC-DC solid-state relay (SSR) with external MOSFET(s). To increase the switching speed, simply utilise the product’s unique load-biasing, onboard 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 enables constant voltage control for properly driving the MOSFET.


⦁ 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

“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 CPC1596 is provided in tape and reel format. Sample requests can be placed through authorised Littelfuse distributors worldwide. 


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