L9935 - 1A Dual H-Bridge Stepper Motor Driver | STMicroelectronics
MPN: L9935 ✓ Hoạt độngL9935 Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho L9935 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với L9935 (cùng hình factor và footprint) — khác nhau ở Control Interface, Output Current per Channel, Package, Protection Features, Thermal Resistance (junction-to-ambient).
L9935_V01
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
L6201P
⚡ Đồng gói ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
L6234D
⚡ Đồng gói ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
L9935 Tỷ lệ tối đa & tính chất điện
| Motor Type | Bipolar Stepper |
| Output Current per Channel | 1 A |
| Supply Voltage Range | 5 V to 40 V |
| Số lượng đầu ra | 2 Full Bridges |
| Control Interface | SPI |
| Hộp | PowerSO-20 (20-SOIC, 0.433", 11.00mm Width) Exposed Pad |
| Kiểu lắp đặt | Surface Mount |
| Kháng nhiệt, mối nối đến môi trường | 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) |
| Trạng thái RoHS | Compliant |
Cấu hình chân L9935
| Chân 1 | OUT1A — Output 1A - H-bridge 1 output |
| Chân 2 | OUT1B — Output 1B - H-bridge 1 output |
| Chân 3 | VS — Supply voltage |
| Chân 4 | OUT2A — Output 2A - H-bridge 2 output |
| Chân 5 | OUT2B — Output 2B - H-bridge 2 output |
| Chân 6 | GND — Ground |
| Chân 7 | SD — Shutdown input |
| Chân 8 | CLK — Clock input for SPI |
| Chân 9 | DATA — Data input for SPI |
| Chân 10 | CS — Chip select for SPI |
| Chân 11 | FLAG — Error flag output |
| Chân 12 | VSS — Logic supply voltage |
Ứng dụng tiêu biểu
L9935 phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho L9935 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- Integrated chopping current regulation (vsL6201P)
- SPI control interface (vsL6201P)
- Controlled output voltage slopes (vsL6234D)
Ghi chú thiết kế
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.
Thông tin tuân thủ
RoHS compliant per STMicroelectronics product page. AEC-Q100 qualification not specified for this part.
