5452

5452

5452

5452

5452

5452

ISO5452

SLLSEQ4A – AUGUST 2015 – REVISED SEPTEMBER 2015

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10 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

10.1 Application Information

The ISO5452 is an isolated gate driver for power semiconductor devices such as IGBTs and MOSFETs. It is

intended for use in applications such as motor control, industrial inverters and switched mode power supplies. In

these applications, sophisticated PWM control signals are required to turn the power devices on and off, which at

the system level eventually may determine, for example, the speed, position, and torque of the motor or the

output voltage, frequency and phase of the inverter. These control signals are usually the outputs of a micro

controller, and are at low voltage levels such as 2.5 V, 3.3 V or 5 V. The gate controls required by the MOSFETs

and IGBTs, on the other hand, are in the range of 30-V (using Unipolar Output Supply) to 15-V (using Bipolar

Output Supply), and need high current capability to be able to drive the large capacitive loads offered by those

power transistors. Not only that, the gate drive needs to be applied with reference to the Emitter of the IGBT

(Source for MOSFET), and by construction, the Emitter node in a gate drive system swings between 0 to the DC

bus voltage, that can be several 100s of volts in magnitude.

The ISO5452 is thus used to level shift the incoming 2.5-V, 3.3-V and 5-V control signals from the microcontroller

to the 30-V (using Unipolar Output Supply) to 15-V (using Bipolar Output Supply) drive required by the power

transistors while ensuring high-voltage isolation between the driver side and the microcontroller side.

10.2 Typical Applications

Figure 47 shows the typical application of a three-phase inverter using six ISO5452 isolated gate drivers. Three-

phase inverters are used for variable-frequency drives to control the operating speed of AC motors and for high

power applications such as High-Voltage DC (HVDC) power transmission.

The basic three-phase inverter consists of three single-phase inverter switches each comprising two ISO5452

devices that are connected to one of the three load terminals. The operation of the three switches is coordinated

so that one switch operates at each 60 degree point of the fundamental output waveform, thus creating a six-

step line-to-line output waveform. In this type of applications, carrier-based PWM techniques are applied to retain

waveform envelope and cancel harmonics.

Figure 47. Typical Motor Drive Application

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