AN2738 datasheet(46/54 Pages) STMICROELECTRONICS

46 / 54 page

The below-ground voltage on the OUT pin

AN2738

46/54

Doc ID 14589 Rev 2

Figure 41.

L6390 safe operating range when the OUT pin is below ground voltage (in

steady state)

11.4

Functionality of L6390 outputs in below-ground condition

The L6390 IC gate driver makes use of a level shifter to send the set-reset information to the

high side floating section. The level shifter, shown in Figure 42, is mainly composed of two

high voltage switches, for set/reset signals, driven by the low voltage section and linked to

two pull-up resistors connected to the BOOT pin.

Figure 42.

Driver functionality in below-ground voltage condition on OUT pin

The two level-shifted signals are then fed into a logic latch in the high side floating section,

providing the logic state for the high side gate driver (HVG output). The L6390 IC provides

Vcc

Vboot-Vout < 20V

Vboot > - 0.3V

Vcc-Vboot

below ground

voltage on Vout

Vboot

Vout

Vcc

Vboot-Vout

Vboot > 5V

Vcc-Vboot

below ground voltage on Vout

Vboot

Vout

High Side

floating

section

Vboot

Vout

Low Side

section

Vcc

set

Level

Shifter

reset

HVG

gnd

Vboot

gnd

for full

functionality

of level shifter

AN2738 Datasheet(PDF) 46 Page - STMicroelectronics

AN2738 Datasheet(HTML) 46 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54

Datasheet Download

Link URL