LTV-3150S

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The LTV-3150S is a versatile isolated gate driver IC that can be used to drive MOSFETs, IGBTs, or other power switches. It features a wide common mode voltage range isolation of 40V with a four-channel version and a two-channel version, respectively rated at up to 4A peak and 10A peak output current. The LTV-3150S is ideal for wide applications in a number of isolated power systems, including motor control, industrial, energy distribution, and medical markets.

Application Field

The LTV-3150S is applicable in many different industrial markets that require isolation of power electronics. Such markets include solar, automotive, consumer electronics, industrial applications, as well as medical and healthcare sectors. It is particularly suitable for motor controllers, lighting control, power supplies, IGBT & MOSFET based power conversion, industrial automation, electrical and energy systems, and medical instrumentation systems.

Because of its wide common mode voltage isolation range (40V), the LTV-3150S is often used in systems that require isolation between high voltage components. This isolation helps protect the main control components from damage due to power surges, spikes, or other transient disturbances. Additionally, its small package size, low power consumption, and high temperature operation make it suitable for many space constrain applications.

Working Principle

The LTV-3150S provides integrated multiple voltage outputs that are designed for driving high-side and low-side power switches. It operates using three primary components: an isolation transformer, a high-voltage (HV) amplifier, and a low-voltage (LV) amplifier. The isolation transformer connects the HV and LV amplifier stages together, enabling the full common-mode voltage level to reach both stages.

The primary function of the HV amplifier is to provide the high side output voltages. This is done by using a voltage divider network, which is connected to the alternating current (AC) line voltage. The AC line voltage provides the primary energy source for the HV amplifier, and the combination of the AC line voltage and the voltage divider network produces a variable voltage output. This variable voltage output is then inverted by the HV amplifier to provide the high side gate-drive voltage.

The primary function of the LV amplifier is to provide the low side output voltages. This is done by using a current source, which is connected to the AC line voltage. The current source provides the primary energy source for the LV amplifier, and the combination of the AC line voltage and the current source produces a variable voltage output. This variable voltage output is then inverted by the LV amplifier to produce the low side gate-drive voltage.

Once the required gate-drive voltages have been generated, the LTV-3150S then provides full integrated gate-drive circuitry for controlling the power switches. Such circuitry includes gate-overvoltage protection, over-current protection, and short-circuit protection. This circuitry ensures that the power switches will remain safe, even when subjected to extreme operating conditions.

The LTV-3150S is a cost-effective and reliable solution for applications that require high voltages and full integration of gate-drive circuitry. It provides a wide common mode voltage isolation range, as well as full protection for the power switches, making it suitable for many industrial applications.

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