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Texas Instruments UC3717AN
- Part No.:
- UC3717AN
- Manufacturer:
- Texas Instruments
- Category:
- Full Half-Bridge (H Bridge) Drivers
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
UC3717AN.pdf
- Description:
- IC HALF BRIDGE DRIVER 1A 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:350
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Product details
Overview
UC3717AN from Texas Instruments is a bipolar stepper motor driver IC in a 16-pin PDIP package, implementing fixed off-time chopper control with integrated bootstrap circuitry to reduce recirculation saturation voltage. It delivers ±1.2A output current, supports 10–46V motor supply, and operates across 0°C to +70°C for full/half/micro-stepping in industrial motion control systems.
For engineers reviewing the UC3717AN datasheet, UC3717AN pinout, UC3717AN application, or UC3717AN equivalent, this page provides verified thermal shutdown behavior (160–180°C), H-bridge output stage architecture, current threshold selection via two-bit D/A inputs (I0/I1), and validated performance under Vm = 36V, VCC = 5V conditions per TI's official electrical characteristics table.
Technical Context
The UC3717AN integrates an H-bridge output stage with four Darlington transistors and built-in fast-recovery commutating diodes, plus integrated bootstrap pull-up to lower source transistor saturation voltage during recirculation. Its current regulation uses a fixed off-time algorithm triggered by comparator thresholds on Pin 10, selected by I0/I1 logic inputs.
Thermal protection employs a dedicated shutdown network limiting junction temperature to ≤180°C with soft intervention, while phase polarity input (Pin 9) controls winding current direction with built-in hysteresis for noise immunity in switched-drive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | ±1.2A peak - enables direct drive of medium-torque bipolar stepper windings without external current amplification |
| Motor Supply Voltage | 10–46V - supports wide-range DC bus operation including 24V and 48V industrial power rails |
| Logic Supply Voltage | 4.75–5.25V - compatible with standard 5V TTL/LS-CMOS logic interfaces |
| Thermal Shutdown Threshold | 160–180°C - activates soft current reduction before catastrophic junction failure |
| Saturation Voltage (Recirculation) | 1.1–1.35V at −0.5A - reduced loss during current decay improves efficiency vs legacy drivers |
| Fixed Off-Time Range | 25–35µs - sets minimum current ripple period and maximum chopper frequency (~67kHz nominal) |
| Comparator Thresholds | 66–436mV (3 levels) - enables discrete current scaling (100%/60%/19%) or inhibit via I0/I1 pins |
Pinout & Package
UC3717AN is housed in a 16-pin plastic dual in-line package (PDIP-N), with exposed GND pins (4, 5, 12, 13, 14, 15, 16) designed for thermal coupling to PCB copper areas. θJA is reducible via soldering GND pins to ≥1 cm² ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | H-Bridge Output (BOUT/AOUT) | High-current emitter outputs driving motor winding ends; rated ±1.2A, low VSAT in recirculation mode |
| 3, 14 | Motor Supply Input (Vm) | Primary high-side power rail input (10–46V); connects to winding supply with local 0.1µF bypass |
| 4, 5, 12, 13, 14, 15, 16 | Ground (GND) | Multiple GND terminals for thermal dissipation and low-impedance return path; must be soldered to PCB ground plane |
| 6 | Logic Supply (VCC) | 5V logic rail input; powers internal logic, comparators, and monostable (7–15mA typical ICC) |
| 7, 8, 9 | Logic Inputs (Phase, I1, I0) | TTL-compatible digital inputs controlling direction (Phase), current level (I0/I1), with hysteresis on Phase |
| 10 | Analog Current Sense Input | Comparator input for winding current feedback; thresholds set by VR reference and I0/I1 state |
| 11 | Reference Voltage Input (VR) | Analog reference (up to 15V) enabling microstepping via continuous threshold adjustment |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Bootstrap Pull-Up | Lowers source transistor saturation voltage during recirculation, reducing power loss by up to 35% vs non-bootstrapped designs |
| Three-Level Current Selection | I0/I1 inputs select 100%, 60%, or 19% of full-scale current threshold - enables torque-matched half-stepping |
| Built-In Fast Recovery Diodes | Eliminates need for external flyback diodes; reduces layout area and EMI from discrete diode switching |
| Soft Thermal Intervention | Gradual current reduction above 160°C prevents abrupt motor stall and allows graceful degradation under overload |
| Fixed Off-Time Chopper Control | Monostable-based timing ensures consistent current ripple period independent of winding L/R time constant |
Applications
| Industrial CNC Positioning | Medical Infusion Pump Actuation |
|---|---|
|
Use Scenario: Precise open-loop positioning of X/Y axes in benchtop CNC mills using NEMA 17 bipolar stepper motors. IC Role / Device Role / Timing Role: UC3717AN serves as the chopper-controlled H-bridge driver, executing full-step and half-step sequences under microcontroller command. Use Value: Fixed off-time regulation maintains ±1.2A winding current across 24V–40V supply variations, ensuring repeatable step torque and minimizing resonance-induced missed steps. |
Use Scenario: Controlled linear displacement of syringe plunger in programmable IV infusion pumps requiring smooth, low-vibration delivery. IC Role / Device Role / Timing Role: UC3717AN implements microstepping via VR-adjusted current thresholds to achieve sub-microliter dosing resolution. Use Value: Integrated thermal shutdown prevents overheating during extended dwell periods, while low recirculation VSAT minimizes heat generation during standby current hold. |
| Automated Laboratory Instrumentation | Printed Circuit Board Router |
|
Use Scenario: Multi-axis sample stage movement in automated spectrophotometers where electromagnetic compatibility and silent operation are critical. IC Role / Device Role / Timing Role: UC3717AN drives dual-phase windings with synchronized phase polarity and current inhibit signals to eliminate torque ripple during direction reversal. Use Value: Built-in hysteresis on Phase input rejects noise from nearby solenoid actuators, preventing false step triggering in dense instrument chassis. |
Use Scenario: High-speed XY gantry motion in desktop PCB milling machines operating at >300 steps/sec with rapid acceleration/deceleration. IC Role / Device Role / Timing Role: UC3717AN delivers 46V overdrive capability with active current limiting, enabling faster winding current rise times than 24V-only drivers. Use Value: Bootstrap-enhanced recirculation reduces power dissipation at 1A, allowing sustained 300+ steps/sec without heatsink in compact enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bipolar stepper motor driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC3717N | Original version without improved thermal shutdown or integrated bootstrap; higher recirculation VSAT (1.5V typ) | Limited to lower duty-cycle or forced-air-cooled systems; not recommended for continuous 1A operation | Select UC3717N only if legacy design reuse is required and thermal margin exceeds 25°C |
| TB6560AHQ | Higher integration (internal oscillator, indexer); 3.5A rating but requires external sense resistors and separate logic supply | Supports microstepping down to 1/8-step natively; lacks UC3717AN's analog VR microstep tuning flexibility | Choose TB6560AHQ when system-level integration outweighs analog current fine-tuning needs |
Compared with UC3717N, UC3717AN offers superior thermal reliability and efficiency; compared with TB6560AHQ, it provides simpler analog microstepping control but requires external step/direction logic - making UC3717AN optimal for custom MCU-based motion controllers prioritizing analog precision over integration.
Availability
UC3717AN is available at Aetrix Electronics and suitable for industrial CNC positioning, medical infusion pump actuation, automated laboratory instrumentation, and printed circuit board router applications requiring stable component supply and long-term obsolescence management.
Supply support for UC3717AN includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in motion control ICs.
The UC3717AN belongs to TI's legacy stepper motor driver product line, engineered specifically for robust, cost-effective chopper-driven bipolar stepper systems in industrial and medical equipment where reliability and thermal resilience are critical.
FAQ
What is the maximum motor supply voltage supported by the UC3717AN?
The UC3717AN supports a motor supply voltage (Vm) range of 10V to 46V, as confirmed in the Absolute Maximum Ratings table. This allows direct use with common industrial DC rails including 24V and 48V systems. Exceeding 46V risks permanent damage to the internal H-bridge transistors and commutating diodes. The UC3717AN datasheet specifies Vm = 36V as the test condition for electrical characterization, confirming reliable operation well within the 46V limit.
Does the UC3717AN require external flyback diodes for stepper motor winding protection?
No, the UC3717AN does not require external flyback diodes because it integrates fast-recovery commutating diodes directly into its H-bridge output stage. These diodes handle current recirculation during PWM off-time, eliminating layout complexity and reducing EMI. The UC3717AN datasheet explicitly states "Built-In Fast Recovery Commutating Diodes" as a key feature, and electrical characteristics include VF measurements for both sink and source paths - confirming full internal diode implementation.
How does the UC3717AN implement microstepping functionality?
The UC3717AN enables microstepping through analog adjustment of its current threshold via the VR reference input (Pin 11), combined with discrete current level selection using I0/I1 (Pins 12/13). While it does not generate microstep waveforms internally, applying a variable VR voltage between 0–5V continuously scales the three comparator thresholds (66–436mV), allowing smooth interpolation between full-step and half-step current levels. This analog method is documented in the Functional Description section and Figure 5A/B waveforms of the UC3717AN datasheet.
What is the purpose of the bootstrap circuitry in the UC3717AN?
The integrated bootstrap circuitry in the UC3717AN lowers the saturation voltage (VSAT) of the source transistors during current recirculation, improving efficiency and reducing thermal load. During off-time, the bootstrap capacitor charges and boosts the base drive of the upper Darlington transistor, reducing its conduction loss. The UC3717AN datasheet quantifies this benefit: VSAT drops from 1.7–2.1V (conduction) to 1.1–1.35V (recirculation) at −0.5A - a 35% reduction that directly decreases power dissipation in the IC.
Can the UC3717AN operate with a 3.3V logic supply?
No, the UC3717AN requires a 5V logic supply (VCC) within 4.75–5.25V, as specified in the Electrical Characteristics table. Its logic inputs (Pins 7, 8, 9) have TTL-compatible thresholds (0.8V low, 2.0–5.0V high), but the internal comparators, monostable, and bias networks are designed for 5V operation. Applying 3.3V to VCC may cause unreliable current sensing, incorrect threshold detection, or failure to trigger the fixed off-time monostable - all confirmed by TI's test conditions specifying VCC = 5V for all characterized parameters of the UC3717AN.
UC3717AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Output Configuration:
- Half Bridge (2)
- Applications:
- General Purpose, Stepper Motors
- Interface:
- Logic
- Load Type:
- Inductive
- Technology:
- Bipolar
- Rds On (Typ):
- -
- Current - Output / Channel:
- 1A
- Current - Peak Output:
- -
- Voltage - Supply:
- 4.75V ~ 5.25V
- Voltage - Load:
- 10V ~ 46V
- Operating Temperature:
- 0°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Features:
- Bootstrap Circuit
- Fault Protection:
- Over Temperature
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
UC3717AN FAQ
1.How can I place an order for UC3717AN through Aetrix?
Please submit a Request for Quotation (RFQ) for UC3717AN on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for UC3717AN reliable?
The price and inventory of UC3717AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC3717AN is usually 5 days.
3.What payment methods are accepted for UC3717AN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC3717AN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC3717AN?
UC3717AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC3717AN order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for UC3717AN?
For technical support, including UC3717AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC3717AN requirements.
6.How does Aetrix verify that UC3717AN is sourced from the original manufacturer or authorized distributors?
All UC3717AN products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that UC3717AN meets industry standards.
7.What is the process for return or replacement of UC3717AN?
All UC3717AN units undergo pre-shipment inspection (PSI). If there is an issue with UC3717AN, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The UC3717AN part is unused and in its original packaging.
Return procedure for UC3717AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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