AN2785 datasheet(44/51 Pages) STMICROELECTRONICS

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Below-ground voltage on the OUT pin

AN2785

44/51

Doc ID 14785 Rev 1

Figure 33.

L6393 safe operating range when OUT pin is below ground voltage (in

steady state)

9.4

Functionality of L6393 outputs in below-ground condition

The L6393 IC gate driver makes use of a level shifter in order to send the set-reset

information to the high-side floating section. The level shifter, shown in Figure 34, 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 34.

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).

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

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