UM0723 datasheet(18/48 Pages) STMICROELECTRONICS

18 / 48 page

Board description

UM0723

18/48

Doc ID 15870 Rev 4

3.3.4

Gate driving circuit

The gates of the switches of the IGBT used are controlled by the L6390D drivers. Please

refer to the L6390 datasheet for a detailed analysis of the driver parameters.

Figure 10 shows the correct driving of the IGBT. As can be seen, the charging current for the

IGBT is different compared to the discharging current due to the diode used. The

configuration used provides the best trade-off between efficiency and EMI distortion.

Thanks to the high-performance L6390 driver, the deadtime insertion between the HVG and

LVG outputs is hardware-guaranteed. In this case, considering the value of the deadtime

resistors used to be 47 k

Ω, the DT of about 600 ns is applied on the outputs in case:

●

The deadtime is not present on HIN and LIN inputs signals.

●

The deadtime present on HIN and LIN inputs is less than hardware-set DT.

On the contrary, the hardware-set deadtime is not the sum of the deadtime present on the

outputs between LVG and HVG if the deadtime present on the HIN and LIN inputs signals is

higher than the hardware-set deadtime.

Figure 10.

Gate driving network

3.3.5

Overcurrent protection

Hardware overcurrent protection (OCP) is implemented on the board. This feature takes full

advantage of the L6390 driver where an internal comparator is implemented. Thanks to the

internal connection between the comparator output and shutdown block, the intervention

time of the overcurrent protection is extremely low, ranging slightly above 200 ns. Please

see Figure 11 below for details of the OCP.

Considering that the overcurrent protection acts as soon as the voltage on the CP+ pin of

the L6390 rises above (approximately equal to) 0.53 V, and considering the default value of

the shunt resistor, it follows that the default value for the maximum allowed current is equal

to:

Equation 1

with the default values this gives:

ISHUNT_MAX = 7 A

D14

1N4148

STGP10NC60KD

R45 120

R41 10

AM00472a

SHU NT MAX

REF

SHUNT

----------------------

--------

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