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MOSFET, IGBT driver eliminates need for shunt resistor

Posted: 28 Jun 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Vishay Intertechnology? IGBT/MOSFET driver? VO3150?

Vishay Intertechnology is adding to its optoelectronics product portfolio a 0.5A MOSFET/IGBT driver that has a 1V maximum low-level output voltage, eliminating the need for negative gate drive. An isolated solution with a high-speed optocoupler and IGBT/MOSFET driver in one package, the new VO3150 is suited for directly driving IGBTs with ratings up to 1200V and 50A in industrial and consumer applications.

Packaged in the 8-pin DIP, the VO3150 saves board space in end products including uninterruptible power supplies, AC and brushless DC motor drives, industrial inverters, switchmode power supplies, and plasma display panels. Additionally, the high output voltage of the closely matches the positive supply voltage, providing an advantage over other MOSFET/IGBT drivers in applications that call for higher supply voltages to enhance the performance of DMOS or IGBT power devices, the company said.

The VO3150 addresses a common problem with power semiconductor devices, where the output voltage drifts upward when the device is run at gate-to-source voltages lower than the 20V typically specified. To avoid this condition, a typical workaround is the use of a shunt resistor at the gate driver output, which prevents the voltage from drifting up. Because the VO3150 does not exhibit the same upward voltage drift, it eliminates the need for extra components to compensate for such behavior.

The VO3150 features an isolation voltage of 5300Vrms with a minimum of 15 kV/s and a typical of 30 kV/s common mode rejection at a VCM of 1500V. It enables quieter end products by operating at a high bandwidth with a switching frequency above 16kHz, which is outside the range of human hearing. It has a maximum propagation delay of only 0.7s, a 7mA maximum supply current, and a wide operating range of 15-30V with undervoltage lockout protection. It operates over the industrial temperature range of -40C to 85C.

Samples and production quantities of the VO3150 are available now, with lead times of six to eight weeks for larger orders.

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