DocID028175 Rev 3

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L6599AF

Pin connection

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13

N.C.

high voltage spacer. The pin is not internally connected to isolate the high voltage pin and

ease compliance with safety regulations (creepage distance) on the PCB.

14

OUT

High-side gate-drive floating ground. Current return for the high-side gate-drive current.

Layout carefully the connection of this pin to avoid too large spikes below ground.

15

HVG

High-side floating gate-drive output. The driver is capable of 0.3 A min. source and 0.7 A

min. sink peak current to drive the upper MOSFET of the half bridge leg. A resistor internally

connected to pin 14 (OUT) ensures that the pin is not floating during UVLO.

16

VBOOT

High-side gate-drive floating supply voltage. The bootstrap capacitor connected between

this pin and pin 14 (OUT) is fed by an internal synchronous bootstrap diode driven in-phase

with the low-side gate drive. This patented structure replaces the normally used external

diode.

Table 2. Pin description (continued)

Pin no.

Type

Function