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DRV8833RTYR Datasheet(PDF) 9 Page - Texas Instruments |
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DRV8833RTYR Datasheet(HTML) 9 Page - Texas Instruments |
9 / 30 page xOUT1 xOUT 2 VM xISEN xIN2 Pre- drive VCP, VINT VM + - PWM OCP OCP xIN1 REF (200mV) DCM Optional DRV8833 www.ti.com SLVSAR1E – JANUARY 2011 – REVISED JULY 2015 7.3 Feature Description 7.3.1 Fixed-Frequency PWM Motor Drivers DRV8833 contains two identical H-bridge motor drivers with current-control PWM circuitry. Figure 5 shows a block diagram of the circuitry. Figure 5. Motor Control Circuitry 7.3.2 Bridge Control and Decay Modes The AIN1 and AIN2 input pins control the state of the AOUT1 and AOUT2 outputs; similarly, the BIN1 and BIN2 input pins control the state of the BOUT1 and BOUT2 outputs. Table 1 shows the logic. Table 1. H-Bridge Logic xIN1 xIN2 xOUT1 xOUT2 FUNCTION Coast/fast 0 0 Z Z decay 0 1 L H Reverse 1 0 H L Forward Brake/slow 1 1 L L decay The inputs can also be used for PWM control of the motor speed. When controlling a winding with PWM, when the drive current is interrupted, the inductive nature of the motor requires that the current must continue to flow. This is called recirculation current. To handle this recirculation current, the H-bridge can operate in two different states: fast decay or slow decay. In fast decay mode, the H-bridge is disabled and recirculation current flows through the body diodes; in slow decay, the motor winding is shorted. To PWM using fast decay, the PWM signal is applied to one xIN pin while the other is held low; to use slow decay, one xIN pin is held high. Table 2. PWM Control of Motor Speed xIN1 xIN2 FUNCTION PWM 0 Forward PWM, fast decay 1 PWM Forward PWM, slow decay 0 PWM Reverse PWM, fast decay PWM 1 Reverse PWM, slow decay Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: DRV8833 |
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