Isoleret gatedriver med fordoblet levetid
Texas Instruments introducerer isoleret gate driver med markant længere levetid og 40 procent hurtigere propagation delays (in english).
Texas Instruments (TI) has introduced an isolated gate driver for insulated-gate bipolar transistors (IGBTs) and MOSFETs that is 40 percent 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.
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 12 V, the gate driver outputs transitions to a logic-low state, turning off the power transistor. This prevents the device from overheating and damage. The new 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..
More information and samples:
www.ti.com/iso5500-pr-eu.
