AN3338 datasheet(17/72 Pages) STMICROELECTRONICS

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AN3338

Electrical characteristics and functions

In this section the main electrical characteristics of the power stage are discussed, together

with a detailed description of all the SLLIMM functions.

2.1

IGBTs

The SLLIMM achieves power savings in the inverter stage thanks to the use of IGBTs

manufactured with the proprietary advanced PowerMESH™ process.

These power devices, optimized for the typical motor control switching frequency, offer an

excellent trade-off between voltage drop (VCE(sat)) and switching speed (tfall), and therefore

minimize the two major sources of energy loss, conduction and switching, reducing the

environmental impact of daily-use equipment. A full analysis on the power losses of the

complete system is reported in

Section 4: Power losses and dissipation.

This IGBT family is capable of surviving short-circuits lasting up to 5 microseconds, as

expected by targeted applications.

2.2

Freewheeling diodes

The Turbo 2 ultrafast high voltage diodes have been adequately selected for the SLLIMM

family and carefully tuned to achieve the best trr/VF trade-off and softness as freewheeling

diodes in order to further improve the total performance of the inverter and significantly

reduce the electromagnetic interference (EMI) in motor control applications which are quite

sensitive to this phenomena.

2.3

High voltage gate drivers

The SLLIMM is equipped with a versatile high voltage gate driver IC (HVIC), designed using

BCD offline (Bipolar, CMOS, and DMOS) technology (see

Figure 9) and particularly suited

to field oriented control (FOC) motor driving applications, able to provide all the functions

and current capability necessary for high side and low side IGBT driving. This driver can be

used in all applications where high voltage shifted control is necessary and it includes a

patented internal circuitry which replaces the external bootstrap diode.

Each high voltage gate driver chip controls two IGBTs in half bridge topology, offering the

basic functions such as dead time, interlocking, integrated bootstrap diode, and also the

advanced features such as smart shutdown (patented), fault comparator, and a dedicated

high performance op amp for advanced current sensing. A schematic summary of the

features by device are listed in

Table 1.

In this application note the main characteristics of a high voltage gate drive related to the

SLLIMM are discussed. For a greater understanding, please refer to the AN2738 application

note.

AN3338 Datasheet(PDF) 17 Page - STMicroelectronics

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