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DRV8714-Q1 Scheda tecnica(PDF) 29 Page - Texas Instruments |
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DRV8714-Q1 Scheda tecnica(HTML) 29 Page - Texas Instruments |
29 / 144 page 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 Submit Document Feedback 29 Product Folder Links: DRV8714-Q1 DRV8718-Q1 |
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