DRV8305_16 Datasheet, PDF (17/59 Pages) Texas Instruments – Three Phase Gate Driver

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DRV8305
SLVSCX2B – AUGUST 2015 – REVISED FEBRUARY 2016
7.3 Feature Description
7.3.1 Integrated Three-Phase Gate Driver
The DRV8305 is a completely integrated three-phase gate driver. It provides three N-channel MOSFET half-
bridge gate drivers, multiple input modes, high-side and low-side gate drive supplies, and a highly configurable
gate drive architecture. The DRV8305 is designed to support a variety applications by incorporating a wide
operating voltage range, wide temperature range, and array of protection features. The configurability of device
allows for it to be used in a broad range of applications.
7.3.2 INHx/INLx: Gate Driver Input Modes
The DRV8305 can be operated in three different inputs modes to support various commutation schemes.
• Table 1 shows the truth table for the 6-PWM input mode. This mode allows for each half-bridge to be placed
in one of three states, either High, Low, or Hi-Z, based on the inputs.
Table 1. 6-PWM Truth Table
INHx
INLx
GHx
GLx
1
1
L
L
1
0
H
L
0
1
L
H
0
0
L
L
MCU PWM
MCU PWM
MCU PWM
MCU PWM
MCU PWM
MCU PWM
INHA
INLA
INHB
INLB
INHC
INLC
6-PWM
Figure 6. 6-PWM Mode
• Table 2 shows the truth table for the 3-PWM input mode. This mode allows for each half-bridge to be placed
in one of two states, either High or Low, based on the inputs. The three high-side inputs (INHx) are used to
control the state of the half-bridge with the complimentary low-side signals being generated internally.
Deadtime can be adjusted through the internal setting (DEAD_TIME) in the SPI registers. In this mode all
activity on INLx is ignored.
Table 2. 3-PWM Truth Table
INHx
INLx
GHx
GLx
1
X
H
L
0
X
L
H
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