Application Note
2 of 53
V 1.0
2019-04-01
IM393 Application note
IM393 IPM Technical Description
Introduction
5.2
Fault output and auto-clear function ................................................................................................... 27
5.3
Undervoltage lockout (UVLO) ............................................................................................................... 29
5.4
Over-temperature protection ............................................................................................................... 31
6
Bootstrap circuit ................................................................................................................... 33
6.1
Bootstrap circuit operation .................................................................................................................. 33
6.2
Initial charge of bootstrap capacitor .................................................................................................... 34
6.3
Bootstrap capacitor selection .............................................................................................................. 34
6.4
Charging and discharging of the bootstrap capacitor during PWM inverter operation ..................... 35
7
Thermal design ..................................................................................................................... 37
7.1
Introduction ........................................................................................................................................... 37
7.2
Power losses .......................................................................................................................................... 38
7.2.1
Conduction losses ............................................................................................................................ 38
7.2.2
Switching losses ............................................................................................................................... 39
7.3
Thermal impedance .............................................................................................................................. 39
7.4
Temperature rise considerations and calculation example ................................................................ 40
7.5
Heat sink selection guide ...................................................................................................................... 42
7.5.1
Required heat sink performance ..................................................................................................... 42
7.5.2
Heat sink characteristics .................................................................................................................. 43
7.5.2.1
Heat transfer from heat source to heat sink .............................................................................. 43
7.5.2.2
Heat transfer within the heat sink .............................................................................................. 43
7.5.2.3
Heat transfer from heat sink surface to ambient ....................................................................... 43
7.5.3
Selecting a heat sink ........................................................................................................................ 45
7.6
Online simulation tool .......................................................................................................................... 45
8
Heat sink mounting and handling guidelines ............................................................................ 47
8.1
Heat sink mounting ............................................................................................................................... 47
8.1.1
General guidelines ........................................................................................................................... 47
8.1.1.1
Recommended tightening torque .............................................................................................. 47
8.1.1.2
Screw tightening to heat sink ..................................................................................................... 48
8.2
Handling guideline ................................................................................................................................ 49
8.3
Storage guideline .................................................................................................................................. 50
8.3.1
Recommended storage conditions ................................................................................................. 50
9
References ........................................................................................................................... 51
Revision history............................................................................................................................. 52
