L6201

Overview
The STMicroelectronics L6201 is a full-bridge power driver IC designed for DC and stepper motor control applications. It integrates two H-bridge drivers with independent enable and direction control, as well as built-in current sensing and protection features. The L6201 is optimized for high-efficiency operation in demanding environments such as industrial automation, robotics, and automotive control systems.

Key Features

* Dual full H-bridge power stage
* Capable of driving inductive loads such as DC motors and stepper motors
* Wide operating voltage range up to 48V
* Continuous output current capability up to 1A per channel
* High output current capability with low saturation voltage
* Overcurrent protection with programmable threshold
* Thermal shutdown protection
* Cross-conduction protection (prevents simultaneous high-side and low-side conduction)
* Current sensing via external low-side shunt resistors
* Compatible with logic level inputs
* Integrated diodes for inductive load demagnetization
* Package: Multiwatt11 or PowerSO20

Electrical Specifications

* Operating Supply Voltage (Vcc): 12V to 48V
* Logic Supply Voltage: Compatible with TTL/CMOS (up to 7V max on logic pins)
* Output Current:

* Continuous: ±1A per channel
* Peak (non-repetitive): ±2A
* Output Saturation Voltage (Total Rds(on)):

* High-side + Low-side combined: ~1.8V at 1A
* Current Limiting Threshold: Set externally via reference voltage and sense resistor
* Input Logic Thresholds: TTL compatible
* Quiescent Current: Low, typically <10 mA
* Switching Frequency: Up to 100 kHz (depending on thermal and load conditions)
* Operating Temperature Range: -25°C to +150°C junction temperature

Pin Configuration and Packaging

* Packages Available:

* Multiwatt11: Through-hole, ideal for heat dissipation with external heatsink
* PowerSO20: Surface-mount, with exposed pad for thermal management
* Key Pins:

* IN1/IN2: Logic control inputs for bridge direction
* EN: Enable input for each bridge
* OUT1/OUT2: H-bridge outputs
* SENSE: Current sense input (connected to external resistor)
* Vref: Voltage reference for current limit
* Vs: Motor supply voltage
* GND: Ground

Functional Description
Each H-bridge in the L6201 allows control of a load in both directions, making it ideal for bidirectional motor driving. The device is controlled via logic-level signals on the IN and EN pins, enabling direction and on/off control. A key feature is the programmable current limit, which is implemented using an external sense resistor and a reference voltage. When the voltage across the sense resistor exceeds the threshold, the device enters current limiting mode to protect the load and driver.

Built-in protection mechanisms include overcurrent shutdown, thermal shutdown, and cross-conduction protection. The thermal shutdown prevents damage in case of overheating by disabling outputs until the temperature drops below a safe threshold.

Applications

* Bidirectional DC motor driving
* Stepper motor control (bipolar configuration)
* Robotics and automation systems
* Motorized actuators
* Industrial control equipment
* Home appliances and office equipment requiring motorized components
* Automotive electromechanical systems

Thermal and Protection Features

* Overcurrent Protection: Limits load current to prevent damage under fault conditions
* Thermal Shutdown: Internal sensor disables outputs above ~150°C
* Cross-Conduction Protection: Ensures no shoot-through current in H-bridge transitions
* Flyback Diodes: Integrated for inductive load demagnetization
* External Sense Resistor: Allows adjustable current limit threshold

Performance and Reliability

* Suitable for mid-power motor control in harsh environments
* Robust protection enhances system reliability
* Efficient output stage reduces heat generation
* Capable of PWM control for speed and torque regulation

Summary
The STMicroelectronics L6201 is a versatile dual full-bridge motor driver designed for reliable operation in demanding environments. Its integrated features—including current sensing, thermal and overcurrent protection, and compatibility with logic-level inputs—make it an excellent choice for applications requiring robust and efficient motor control. The availability of both through-hole and surface-mount packages provides flexibility for different thermal and mechanical design constraints.