L9935 - 1A Dual H-Bridge Stepper Motor Driver | STMicroelectronics
N.º de pieza: L9935 ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $3.42 | $3,42 |
| 10 | $3.08 | $30,80 |
| 100 | $2.74 | $274,00 |
| 500 | $2.46 | $1.230,00 |
| 1.000 | $2.19 | $2.190,00 |
L9935 Descripción general
A stepper motor driver is an integrated circuit that translates low-power control signals from a microcontroller into the higher-current, higher-voltage signals needed to drive a stepper motor. It typically contains H-bridge topologies that allow bidirectional current flow through the motor windings, enabling precise position control in open-loop systems. Stepper motor drivers are a subset of motor drivers, which fall under power management ICs, specifically designed for motion control in automotive, industrial, and consumer applications.
Key features of the L9935 include a wide supply voltage range (5V to 40V), continuous output current of 1A per channel, and integrated chopping current regulation to minimize power dissipation. The device also features controlled output voltage slopes to reduce electromagnetic radiation, short-circuit protection on all outputs, and an error flag for overload, open load, and overtemperature pre-alarm. The PowerSO-20 package offers a thermal resistance of 35°C/W, allowing operation at high ambient temperatures without external heatsinking in moderate load conditions.
The L9935 utilizes a bipolar-CMOS-DMOS (BCD) process technology, integrating power MOSFETs with control logic on a single die. This architecture provides high efficiency and fast switching, with a typical rise/fall time of 100ns. The device includes a serial interface for controlling the H-bridges, reducing the number of GPIO pins required from the microcontroller. The built-in protection features ensure robust operation in harsh automotive environments, where voltage transients and thermal stress are common.
Typical applications include automotive DC motor control for power windows, mirrors, and seat adjustment, as well as industrial automation for conveyor belts and robotic actuators. The wide supply voltage range and high current capability make it versatile for various motor types, including brushed DC motors and stepper motors in bipolar configurations.
When designing with the L9935, ensure adequate PCB copper area for heat dissipation, especially when operating at high currents. The standby mode can be used to reduce power consumption when the motor is idle, but note that the serial interface must be re-initialized after waking from standby. Proper decoupling capacitors on the supply and logic pins are essential to maintain stable operation.
Alternativas directas para L9935 — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con L9935 (mismo factor de forma y huella) — difiere en Control Interface, Output Current per Channel, Package, Protection Features, Thermal Resistance (junction-to-ambient).
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
L9935_V01
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
L6201P
⚡ Mismo encapsulado ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
L6234D
⚡ Mismo encapsulado ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
L9935 Valores máximos y características eléctricas
| Motor Type | Bipolar Stepper |
| Output Current per Channel | 1 A |
| Supply Voltage Range | 5 V to 40 V |
| Número de salidas | 2 Full Bridges |
| Control Interface | SPI |
| Encapsulado | PowerSO-20 (20-SOIC, 0.433", 11.00mm Width) Exposed Pad |
| Tipo de montaje | Surface Mount |
| Resistencia térmica, unión a ambiente | 35 °C/W |
| Saturation Voltage | 1.2 V at 1 A |
| Rise/Fall Time | 100 ns (typical) |
| Protection Features | Short-Circuit, Thermal Shutdown, Overload, Open Load, Overtemperature Pre-alarm |
| Standby Mode | Yes |
| Process Technology | BCD (Bipolar-CMOS-DMOS) |
| Estado RoHS | Compliant |
Configuración de pines de L9935
| Pin 1 | OUT1A — Output 1A - H-bridge 1 output |
| Pin 2 | OUT1B — Output 1B - H-bridge 1 output |
| Pin 3 | VS — Supply voltage |
| Pin 4 | OUT2A — Output 2A - H-bridge 2 output |
| Pin 5 | OUT2B — Output 2B - H-bridge 2 output |
| Pin 6 | GND — Ground |
| Pin 7 | SD — Shutdown input |
| Pin 8 | CLK — Clock input for SPI |
| Pin 9 | DATA — Data input for SPI |
| Pin 10 | CS — Chip select for SPI |
| Pin 11 | FLAG — Error flag output |
| Pin 12 | VSS — Logic supply voltage |
Aplicaciones típicas
L9935 es adecuado para 6 aplicacións: Automotive Power Windows, Industrial Conveyor Belt Control, Robotic Actuators, Automotive Mirror Adjustment, 3D Printers, Medical Device Positioning.
Automotive Power Windows
The L9935 drives the DC motor for power windows, providing bidirectional control and protection. Its 1A output current and 5V-40V supply range make it suitable for 12V automotive systems. The integrated short-circuit protection and thermal shutdown ensure reliable operation in harsh environments. The SPI interface allows precise control of window position and speed.
Recomendado
Industrial Conveyor Belt Control
The L9935 drives the stepper motor in conveyor belt systems, providing precise position control and high reliability. Its 1A output current and integrated current regulation ensure smooth operation. The wide supply voltage range (5V-40V) allows use in 24V industrial systems. The error flag output provides diagnostic information for predictive maintenance.
Recomendado
Robotic Actuators
The L9935 drives the stepper motors in robotic actuators, providing precise position and speed control. Its 1A output current and SPI interface enable smooth, coordinated motion. The integrated protection features prevent damage from overloads and short circuits. The compact PowerSO-20 package is ideal for space-constrained robot designs.
Recomendado
Automotive Mirror Adjustment
The L9935 drives the DC motors for mirror adjustment, providing precise positioning and protection. Its 1A output current and 5V-40V supply range are suitable for 12V automotive systems. The SPI interface allows fine control of mirror position. The thermal shutdown feature prevents damage during prolonged operation.
Recomendado
3D Printers
The L9935 drives the stepper motors in 3D printers, providing precise position control for the print head and build platform. Its 1A output current and integrated current regulation ensure smooth, accurate motion. The SPI interface allows fine control of motor speed and position. The compact package is ideal for space-constrained printer designs.
Recomendado
Medical Device Positioning
The L9935 drives the stepper motors in medical devices for precise positioning, such as in infusion pumps or diagnostic equipment. Its 1A output current and SPI interface enable accurate, repeatable motion. The integrated protection features ensure safe operation in medical environments. The wide supply voltage range allows use in various power systems.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para L9935 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | L9935_V01 | L6201P | L6234D |
|---|---|---|---|---|
| Package | PowerSO-20 | PowerSO-20 | PowerSO-20 | PowerSO-20 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Output Current per Channel | 1 A | 1 A | 1 A | 1.4 A (peak) |
| Supply Voltage Range | 5 V to 40 V | 5 V to 40 V | 12 V to 48 V | 7 V to 52 V |
| Control Interface | SPI | SPI | Parallel | Parallel |
| Number of Outputs | 2 Full Bridges | 2 Full Bridges | 2 Full Bridges | 3 Half Bridges |
| Integrated Current Regulation | Yes | Yes | No | No |
| Short-Circuit Protection | Yes | Yes | Yes | Yes |
Diferenciadores clave
- Integrated chopping current regulation (frente a L6201P)
- SPI control interface (frente a L6201P)
- Controlled output voltage slopes (frente a L6234D)
Notas de diseño
The L9935 in PowerSO-20 package has a thermal resistance of 35°C/W. At 1A output current and 12V supply, power dissipation can be significant. Ensure adequate PCB copper area and consider a heatsink for high ambient temperature applications. The exposed pad should be soldered to a large copper pour for optimal heat transfer.
Place decoupling capacitors (100nF and 10uF) close to the VS and VSS pins to filter noise and prevent voltage spikes. Use a ground plane to minimize EMI. The controlled output voltage slopes of the L9935 help reduce electromagnetic radiation, but proper layout is still essential for compliance with EMC standards.
After waking from standby mode, the SPI interface must be re-initialized. Ensure the microcontroller firmware handles this correctly. Also, verify that the supply voltage does not exceed the absolute maximum rating of 40V, as transients in automotive systems can cause damage. Use a TVS diode for protection.
Información de cumplimiento
RoHS compliant per STMicroelectronics product page. AEC-Q100 qualification not specified for this part.
