AN994

L6387E

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L6387E

The L6387E (shown in Figure 10) is based on the structure of the L6385E. It has two

separate inputs and also includes an interlocking function to avoid both power switches from

being unintentionally switched on at the same time (see Table 5).

(typical). There is no UVLO on the upper driving section.

The L6387E can be evaluated using the L6385E board.

Table 4.

L6387E pin description

N.

Name

Type

Function

1

I

2

I

3

V

CC

4

GND

Ground.

5

LVG

O

Low-side driver output. The output stage can deliver a 400 mA source and a 650 mA sink

resistor connected between the gate and the source of the external MOSFET normally

used to hold the pin low.

6

OUT

O

High-side driver floating reference. Attention should be paid to the layout design of the

power stage so as to limit below-ground spikes on this pin.

7

HVG

O

High-side driver output. The output stage can deliver a 400 mA source and a 650 mA sink

(typical values). The circuit guarantees 0.3 V maximum between this pin and Vout (at

for the bleeder resistor connected between the gate and the source of the external

MOSFET normally used to hold the pin low.

8

Bootstrap supply voltage. This is the floating supply of the high-side driver. The bootstrap

capacitor connected between this pin and pin 6 can be fed by an internal structure named

"bootstrap driver" (a patented structure). This structure can replace the external bootstrap

diode.

1.

The pull-down internal resistor is typically some hundred k

Ωs.