Gan Systems GS-EVB-HB-0650603B-HD Technisches Handbuch - Seite 6

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2 Technical Description

2.1 Gate Pull Up and Pull Down Resistors

The HEY1011-L12C gate driver has independent output pins for the gate pull up and gate pull down

allowing control of the turn-on and turn-off rise and fall times.

The default values for these resistors are:

•

OUTPU:

R1 and R5 = 10 Ohms

•

OUTPD:

R3 and R7 = 1 Ohm

These values can be modified to suit your own application.

2.2 Enable and Start Sequence

The HEY1011-L12C has an open drain enable pin (EN) to facilitate a system level wired-AND start up.

When the enable pin is externally pulled low this forces the driver into a low power mode. The driver

output is pulled low in this mode. In the event of an internal fault condition, such as UVLO, this pin is

actively pulled low internally by the driver. During normal operation, the pin is released by the driver, and

must be pulled high with an external pull-high resistor. This functionality can be used by the PWM

controller as an indication that it can start sending IN pulses to the driver. It is typically wired AND with

the controller enable pin as shown in

The GS-EVB-HB-0650603B-HD evaluation board provides direct access to the EN pin on connector

CONN1. Internally the board contains a 100k pull up resistor connected from VDRV to the EN_PU pin on

connector CONN1 – see schematic in

pins EN and EN_PU must be linked together on CONN1 to make use of the internal 100k pull up resistor

to enable the driver. If the EN pin is left floating, the drivers will not respond to INL or INH input signals.

The start up sequence of the HEY1011-L12C is shown in

after which V

reaches the UVLO rising level to the HEY1011-L12C releasing the EN internal pull down.

DRV

IMPORTANT the IN signal must not be applied before the EN pin has been released.

GS-EVB-HB-0650603B-HD TM Rev. 210712

below.

Figure 2

. If external control of the enable function is not required,

Figure 11

Figure 2: HEY1011-L12C Wired-AND enable

Please refer to the Evaluation Board/Kit Important Notice on page # 16

GS-EVB-HB-0650603B-HD

Half Bridge Bipolar Drive Switch Board

below. Time T

Figure 3

START

Technical Manual

is defined as the time