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DRV8714-Q1 Scheda tecnica(PDF) 29 Page - Texas Instruments

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Il numero della parte DRV8714-Q1
Spiegazioni elettronici  DRV871x-Q1 Automotive Multi-Channel Smart Half-Bridge Gate Drivers With Wide Common Mode Current Sense Amplifiers
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Table 8-8. Half-Bridge PWM Control (PWMx_HL and PWMx_FW)
HBx_PWM (1-4)
HBx_HL (1-4)
HBx_FW (1-4)
Gate Driver State
GHx (1-4)
GLx (1-4)
SHx (1-4)
PWMx
0
0
PWM High-Side
Active FW
PWMx
!PWMx
PWMx
1
PWM Low-Side
Active FW
!PWMx
PWMx
!PWMx
0
1
PWM High-Side
Passive FW
PWMx
L
PWMx
1
PWM Low-Side
Passive FW
L
PWMx
!PWMx
DRV8714-Q1 Half-Bridge Control
IN1/EN1
IN2/PH1
M2
IN3/EN2
IN4/PH2
LS
Load
HS
Load
M1
HB2_CTRL = PWM
HB2_PWM = IN2
HB3_CTRL = PWM
HB3_PWM = IN3
HB4_CTRL = PWM
HB4_PWM = IN4
HB1_CTRL = PWM
HB1_PWM = IN1
x4
x4
x4
x4
Figure 8-7. PWM Mapping Example 1
DRV8714-Q1 Half-Bridge Control
IN1/EN1
IN2/PH1
IN3/EN2
IN4/PH2
LS
Load
HB2_CTRL = HI-Z
HB2_PWM = n/a
HB3_CTRL = PWM
HB3_PWM = IN2
HB4_CTRL = PWM
HB4_PWM = IN2
HB1_CTRL = L
HB1_PWM = n/a
M1
M2
X
X
x4
x4
x4
x4
Figure 8-8. PWM Mapping Example 2
8.3.3.2 H-Bridge Control
8.3.3.2.1 DRV8714-Q1 H-Bridge Control
In the H-bridge control mode, each two pairs of half-bridge gate drivers can be controlled as an H-bridge gate
driver for a total of two H-bridge gate drivers for the DRV8714-Q1. The H-bridge pairs are half-bridges 1 / 2 and
3 / 4 for the DRV8714-Q1. The DRV8714-Q1 can control the 2 H-bridge gate driver pairs through direct inputs
pins or SPI control registers. The H-bridge gate drivers have two input control modes that can be configured
through the BRG_MODE register setting (01b = PH/EN and 10b = PWM) on SPI interface variants or the MODE
pin (Level 2 = PH/EN and Level 3 = PWM) on H/W interface variants. The PH/EN mode allows for the H-bridge
to be controlled with a speed/direction type of interface commanded by one PWM signal and one GPIO signal.
The PWM mode allows for the H-bridge to be controlled with a more advanced scheme typically requiring two
PWM signals. This allows the H-bridge driver to enter four different output states for additional control flexibility if
required.
The DRV8714-Q1 PWM inputs pins (IN1/EN1, IN2/PH1, IN3/EN2, IN4/PH2) are used to set the PWM frequency
and duty cycle for the assigned output. If PWM control is not required, the two h-bridge gate drivers can be
controlled directly through the SPI control registers. The INx/ENx and INx/PHx SPI control can be enabled
through the INx/ENx_MODE and INx/PHx_MODE register settings. Each H-bridge can be individually set to Hi-Z
through the HIZ register setting.
The default active freewheeling mode is active low-side. The DRV8714-Q1 SPI interface variants provide the
ability to configure the freewheeling state through the FW register setting. This setting can be utilized to modify
the bridge between low-side or high-side active freewheeling. The H/W interface variants default to low-side
freewheeling.
www.ti.com
DRV8714-Q1, DRV8718-Q1
SLVSEA2 – AUGUST 2020
Copyright © 2020 Texas Instruments Incorporated
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