L6718 datasheet(17/71 Pages) STMICROELECTRONICS

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L6718

Pin description and connection diagrams

PWM3 /

SPWM

Third phase PWM output of multi-phase rail or PWM output for single-

phase rail.

Connect to external driver PWM input if this channel is used.

Internally pull up to 3.3 V, connect to external driver PWM3 when channel

3 is used (seeTable 7 for details). The device is able to manage HiZ status

by setting the pin floating.

If SWAP mode is selected by pinstrapping Config0, it must be connected

to single-phase external driver SPWM, see Section 6.3 for details.

PHASE1

Channel 1 HS driver return path.

It must be connected to the HS1 MOSFET source and provides return

path for the HS driver of channel 1.

HGATE1

Channel 1 HS driver output.

It must be connected to the HS1 MOSFET gate. A small series resistor

helps to reduce the device-dissipated power and the negative phase

spike.

BOOT1

Channel 1 HS driver supply.

Connect through a capacitor (220 nF typ.) and a resistor (2.2 Ohm typ.) to

PHASE1 and provide a Schottky bootstrap diode. A small resistor in

series to the boot diode helps to reduce boot capacitor overcharge.

VCC12

7 V supply.

It is the low-side driver supply. It must be connected to the 7 V bus and

filtered with 2 x 1 µf MLCC caps vs. GND.

BOOT2

Channel 2 high-side driver supply.

Connect through a capacitor (220 nF typ.) and a resistor (2.2 Ohm typ.) to

PHASE2 and provide a Schottky bootstrap diode. A small resistor in

series to the boot diode helps to reduce boot capacitor overcharge.

HGATE2

Channel 2 high-side driver output.

It must be connected to the HS2 MOSFET gate. A small series resistor

helps to reduce the device-dissipated power and the negative phase spike

PHASE2

Channel 2 HS driver return path.

It must be connected to the HS2 MOSFET source and provides a return

path for the HS driver of channel 2.

LGATE2

Channel 2 low-side driver output.

It must be connected to the LS2 MOSFET gate. A small series resistor

helps to reduce device-dissipated power.

LGATE1

Channel 1 low-side driver output.

It must be connected to the LS1 MOSFET gate. A small series resistor

helps to reduce device-dissipated power.

SVREADY

Single-phase rail VREADY

Open drain output set free after SS has finished and pulled low when

triggering any protection on the single-phase rail. Pull up to a voltage

lower than 3.3 V (typ.), if not used it can be left floating.

Table 2. Pin description (continued)

Pin#

Name

Function

L6718 数据表(PDF) 17 Page - STMicroelectronics

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