ZHCSG01C February 2017 – August 2018 DRV8320 , DRV8320R , DRV8323 , DRV8323R
PRODUCTION DATA.
- 1 特性
- 2 應用
- 3 說明
- 4 修訂歷史記錄
- 5 Device Comparison Table
- 6 Pin Configuration and Functions
- 7 Specifications
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3
Feature Description
- 8.3.1 Three Phase Smart Gate Drivers
- 8.3.2 DVDD Linear Voltage Regulator
- 8.3.3 Pin Diagrams
- 8.3.4 Low-Side Current Sense Amplifiers (DRV8323 and DRV8323R Only)
- 8.3.5 Step-Down Buck Regulator
- 8.3.6 Gate Driver Protective Circuits
- 8.4 Device Functional Modes
- 8.5 Programming
- 8.6
Register Maps
- Table 1. DRV832xS and DRV832xRS Register Map
- 8.6.1 Status Registers
- 8.6.2 Control Registers
-
9 Application and Implementation
- 9.1 Application Information
- 9.2
Typical Application
- 9.2.1
Primary Application
- 9.2.1.1 Design Requirements
- 9.2.1.2 Detailed Design Procedure
- 9.2.1.3 Application Curves
- 9.2.2 Alternative Application
- 9.2.1
Primary Application
- 10Power Supply Recommendations
- 11Layout
- 12器件和文檔支持
- 13機械、封裝和可訂購信息
8.3.1.1.3 1x PWM Mode (PWM_MODE = 10b or MODE Pin = Hi-Z)
In 1x PWM mode, the DRV832x family of devices uses 6-step block commutation tables that are stored internally. This feature allows for a three-phase BLDC motor to be controlled using one PWM sourced from a simple controller. The PWM is applied on the INHA pin and determines the output frequency and duty cycle of the half-bridges.
The half-bridge output states are managed by the INLA, INHB, and INLB pins which are used as state logic inputs. The state inputs can be controlled by an external controller or connected directly to the digital outputs of the Hall effect sensor from the motor (INLA = HALL_A, INHB = HALL_B, INLB = HALL_C). The 1x PWM mode usually operates with synchronous rectification (low-side MOSFET recirculation); however, the mode can be configured to use asynchronous rectification (MOSFET body diode freewheeling) on SPI devices. This configuration is set using the 1PWM_COM bit in the SPI registers.
The INHC input controls the direction through the 6-step commutation table which is used to change the direction of the motor when Hall effect sensors are directly controlling the state of the INLA, INHB, and INLB inputs. Tie the INHC pin low if this feature is not required.
The INLC input brakes the motor by turning off all high-side MOSFETs and turning on all low-side MOSFETs when the INLC pin is pulled low. This brake is independent of the state of the other input pins. Tie the INLC pin high if this feature is not required.
Table 4. Synchronous 1x PWM Mode
| LOGIC AND HALL INPUTS | GATE DRIVE OUTPUTS(1) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| STATE | INHC = 0 | INHC = 1 | PHASE A | PHASE B | PHASE C | DESCRIPTION | |||||||
| INLA | INHB | INLB | INLA | INHB | INLB | GHA | GLA | GHB | GLB | GHC | GLC | ||
| Stop | 0 | 0 | 0 | 0 | 0 | 0 | L | L | L | L | L | L | Stop |
| Align | 1 | 1 | 1 | 1 | 1 | 1 | PWM | !PWM | L | H | L | H | Align |
| 1 | 1 | 1 | 0 | 0 | 0 | 1 | L | L | PWM | !PWM | L | H | B → C |
| 2 | 1 | 0 | 0 | 0 | 1 | 1 | PWM | !PWM | L | L | L | H | A → C |
| 3 | 1 | 0 | 1 | 0 | 1 | 0 | PWM | !PWM | L | H | L | L | A → B |
| 4 | 0 | 0 | 1 | 1 | 1 | 0 | L | L | L | H | PWM | !PWM | C → B |
| 5 | 0 | 1 | 1 | 1 | 0 | 0 | L | H | L | L | PWM | !PWM | C → A |
| 6 | 0 | 1 | 0 | 1 | 0 | 1 | L | H | PWM | !PWM | L | L | B → A |
Table 5. Asynchronous 1x PWM Mode 1PWM_COM = 1 (SPI Only)
| LOGIC AND HALL INPUTS | GATE DRIVE OUTPUTS | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| STATE | INHC = 0 | INHC = 1 | PHASE A | PHASE B | PHASE C | DESCRIPTION | |||||||
| INLA | INHB | INLB | INLA | INHB | INLB | GHA | GLA | GHB | GLB | GHC | GLC | ||
| Stop | 0 | 0 | 0 | 0 | 0 | 0 | L | L | L | L | L | L | Stop |
| Align | 1 | 1 | 1 | 1 | 1 | 1 | PWM | L | L | H | L | H | Align |
| 1 | 1 | 1 | 0 | 0 | 0 | 1 | L | L | PWM | L | L | H | B → C |
| 2 | 1 | 0 | 0 | 0 | 1 | 1 | PWM | L | L | L | L | H | A → C |
| 3 | 1 | 0 | 1 | 0 | 1 | 0 | PWM | L | L | H | L | L | A → B |
| 4 | 0 | 0 | 1 | 1 | 1 | 0 | L | L | L | H | PWM | L | C → B |
| 5 | 0 | 1 | 1 | 1 | 0 | 0 | L | H | L | L | PWM | L | C → A |
| 6 | 0 | 1 | 0 | 1 | 0 | 1 | L | H | PWM | L | L | L | B → A |
Figure 18 and Figure 19 show the different possible configurations in 1x PWM mode.
Figure 18. 1x PWM—Simple Controller 
Figure 19. 1x PWM—Hall Effect Sensor