Electronic Components DRV8811PWP Integrated Circuit 28-PowerTSSOP 0.173 4.40mm Width

1 Features

• Pulse Width Modulation (PWM) Microstepping Motor Driver – Up to 1/8-Step Microstepping Indexer – Step and Direction Control – Programmable Mixed Decay, Blanking, and Off-Time

• Up to 1.9-A Current Per Winding

• Low 1.0-Ω (HS+LS) MOSFET RDS(on) (25°C)

• 8-V to 38-V Operating Supply Voltage Range

• Pin-to-Pin Compatible With the DRV8818

• Thermally Enhanced Surface Mount Package

• Protection Features: – VM Undervoltage Lockout (UVLO) – Overcurrent Protection (OCP) – Thermal Shutdown (TSD)

2 Applications

• Printers

• Scanners

• Office Automation Machines

• Gaming Machines

• Factory Automation

• Robotics.

3 Description The DRV8811 device provides an integrated stepper motor driver solution for printers, scanners, and other automated equipment applications. The device has two H-bridge drivers, as well as microstepping indexer logic to control a stepper motor. The output driver block consists of N-channel power MOSFETs configured as full H-bridges to drive the motor windings. A simple STEP-and-DIR interface allows easy interfacing to controller circuits. Step mode pins allow for configuration of the motor in full-step, half-step, quarter-step, or eighth-step modes. Decay mode and PWM off-time are programmable. Internal shutdown functions are provided for overcurrent protection, short-circuit protection, undervoltage lockout and overtemperature. The DRV8811 device is packaged in a PowerPAD™ 28-pin HTSSOP package with thermal pad.

Overview The DRV8811 device is a highly configurable, integrated motor driver solution for bipolar stepper motors. The device integrates two H-bridges, current sense and regulation circuitry, and a microstepping indexer. The DRV8811 device can be powered with a supply voltage between 8 V and 38 V and is capable of providing an output current up to 1.9 A full-scale. A simple STEP and DIR interface allows for easy interfacing to the controller. The internal indexer is able to execute high-accuracy microstepping without requiring the controller to manage the current regulation loop. The current regulation is highly configurable, with three decay modes of operation. They are fast, slow, and mixed decay, which can be selected depending on the application requirements. The DRV8811 device also provides configurable blanking, off time, and mixed decay, in order to adjust to a wide range of motors. A low-power sleep mode is incorporated which allows for minimal power consumption when the system is idle.

Decay Mode During PWM current chopping, the H-bridge is enabled to drive through the motor winding until the PWM current chopping threshold is reached. This is shown in Figure 7, Item 1. The current flow direction shown indicates positive current flow in Table 2. Once the chopping current threshold is reached, the H-bridge can operate in two different states, fast decay or slow decay. In fast decay mode, once the PWM chopping current level has been reached, the H-bridge reverses state to allow winding current to flow in a reverse direction. If synchronous rectification is enabled (SRn pin logic low), the opposite FETs are turned on; as the winding current approaches zero, the bridge is disabled to prevent any reverse current flow. If SRn is high, current is recirculated through the body diodes, or through external Schottky diodes. Fast-decay mode is shown in Figure 7, Item 2. In slow-decay mode, winding current is recirculated by enabling both of the low-side FETs in the bridge. This is shown in Figure 7, Item 3.

Overcurrent Protection (OCP) If the current through any FET exceeds the preset overcurrent threshold, all FETs in the H-bridge are disabled until the ENABLEn pin has been brought high and then back low, or power is removed and re-applied. Overcurrent conditions are sensed in both directions; that is, any short to ground, supply, or across the motor winding results in an overcurrent shutdown. Note that overcurrent protection does not use the current-sense circuitry used for PWM current control and is independent of the ISENSE resistor value or VVREF voltage. Additionally, in the case of an overcurrent event, the microstepping indexer is reset to the home state

Thermal Shutdown (TSD) If the die temperature exceeds safe limits, all drivers in the device are shut down and the indexer is reset to the home state. Once the die temperature has fallen to a safe level, operation resumes.

Undervoltage Lockout (UVLO) If at any time the voltage on the VM pins falls below the undervoltage-lockout threshold voltage, all circuitry in the device is disabled and the indexer is reset to the home state. Operation resumes when VM rises above the UVLO threshold.

Product name:DRV8811PWP
Manufacturer: Texas Instruments	Product Category: Motor/Motion/Ignition Controllers and Drives
Product: Stepper Motor Controllers / Drivers	Type: Stepper Driver
Operating Supply Voltage: 8 V to 38 V	Output current: 1.4 A
Operating supply current: 2.5 A	Minimum operating temperature: - 40 C
Maximum operating temperature: + 85 C	Installation style: SMD/SMT
Package/Case: HTSSOP-28	Package: Tube
Development Kit: DRV8811EVM	Features: P2P DRV8811/18
Moisture Sensitivity: Yes	Number of outputs: 2 Output
Product Type: Motor / Motion / Ignition Controllers & Drivers	Rds On-Drain Source On Resistance: 1 Ohms
Series: DRV8811	Factory Packing Quantity: 150
Subcategory: PMIC - Power Management ICs	Unit weight: 118.500 mg