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TI announces 2.5A isolated gate driver

Posted: 09 Oct 2012 ?? ?Print Version ?Bookmark and Share

Keywords:ISO5500? MOSFET? IGBT? optocoupler? magnetic isolator?

Texas Instruments Inc. (TI) has unleashed an isolated gate driver for insulated-gate bipolar transistors (IGBTs) and MOSFETs that the company said is 40 per cent faster than equivalent optical gate drivers. The input TTL logic and output power stage in the ISO5500 are separated by a capacitive, silicon dioxide (SiO2) isolation barrier that doubles the lifetime of the device compared to optocouplers and magnetic isolators, added the company.

When used with isolated power supplies, the device provides for safer, more reliable electronics by blocking high voltages, isolating ground and preventing noise currents from entering the local ground and interfering with or damaging sensitive circuitry.

The ISO5500 provides over-current protection, while an under-voltage lockout circuit monitors the output power supply to ensure sufficient gate drive voltage in motor control, motion control, industrial inverter and switch-mode power supply applications. If the output supply drops below 12V, the gate driver outputs transitions to a logic-low state, turning off the power transistor. This prevents the device from overheating and damage. The gate driver is qualified for operating at extended temperatures from -40C to 125C.

To provide secondary power supply to the ISO5500, the SN6501 transformer driver can be used in conjunction with a transformer, rectifier and a regulator. The result is a small, low-cost, high-efficiency, low electro-magnetic interference (EMI), solution for generating the isolated power to the system, indicated TI.

The ISO5500EVM is available to evaluate device parameters while acting as a guide for board layout. It can be ordered for $49. The ISO5500 is available in a 10.3 x 10.3mm, 16-pin SOIC package. Suggested retail pricing in 1,000-unit quantities is $3.00.

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