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Texas Instruments UC3717AQTR
- Part No.:
- UC3717AQTR
- Manufacturer:
- Texas Instruments
- Category:
- Full Half-Bridge (H Bridge) Drivers
- Package:
- 20-LCC (J-Lead)
- Datasheet:
-
UC3717AQTR.pdf
- Description:
- IC HALF BRIDGE DRIVER 1A 20PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,789
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Product details
Overview
UC3717AQTR from Texas Instruments is a bipolar stepper motor driver IC with H-bridge output stage, supporting full-step, half-step, and micro-step operation. It delivers ±1.2A peak output current, operates from 10V to 46V motor supply, integrates bootstrap circuitry for reduced recirculation saturation voltage (1.1–1.35V at –0.5A), and features thermal shutdown at +160°C to +180°C - used in precision motion control for industrial automation and CNC positioning systems.
For engineers reviewing the UC3717AQTR datasheet, UC3717AQTR pinout, UC3717AQTR application, or UC3717AQTR equivalent, key selection criteria include its fixed off-time current regulation architecture, PLCC-20 package thermal performance, bipolar winding drive capability, and compatibility with LS-TTL/microprocessor control interfaces.
Technical Context
The UC3717AQTR implements fixed off-time chopper control using an internal monostable and two-bit D/A threshold selection (100%/60%/19% current levels), enabling precise peak current limiting via external sense resistor and RC timing network. Its H-bridge output stage comprises four Darlington transistors with built-in fast-recovery commutating diodes and integrated bootstrap pull-up for improved recirculation efficiency.
Phase polarity logic provides noise-immune bidirectional winding current control with hysteresis, while thermal protection intervenes softly by reducing winding current before hard shutdown. The device requires separate logic supply (VCC = 4.75–5.25V) and analog reference (VR ≤ 15V), with analog input (Pin 10) accepting filtered current-sense voltage for comparator-based regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | ±1.2A peak - supports bipolar stepper windings up to 1A RMS without external heatsink under typical conditions |
| Motor Supply Range | 10V to 46V - enables high-torque operation with overvoltage drive while maintaining safe transistor VCE margin |
| Logic Supply Voltage | 4.75V to 5.25V - compatible with standard 5V TTL/LS logic without level-shifting |
| Thermal Shutdown Threshold | +160°C to +180°C - soft intervention reduces current before catastrophic junction failure |
| Saturation Voltage (Recirc) | 1.1–1.35V at –0.5A - lower conduction loss during current decay improves efficiency and thermal margin |
| Fixed Off-Time Control | 25–35µs (RT=56kΩ, CT=820pF) - sets chopper frequency and ripple magnitude for stable current regulation |
| Comparator Thresholds | 66–90mV / 236–266mV / 396–436mV - selectable via I0/I1 pins for discrete current-level programming |
Pinout & Package
UC3717AQTR uses a 20-pin PLCC (Q package, drawing FN) with exposed thermal pad on underside; GND pins (4, 5, 12, 13, 14, 16, 17, 20) must be soldered to PCB copper area for θJA reduction per TI mounting guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | H-Bridge Output | High-current source/sink terminals for one motor winding; rated ±1.2A, low VSAT in recirculation |
| 2 | Timing Input | Connects to RT–CT network setting fixed off-time (TOFF = 0.69·RT·CT); determines chopper frequency |
| 3, 14, 17 | Motor Supply (Vm) | High-voltage inputs tied together; accepts 10–46V DC for winding drive power |
| 4, 5, 12, 13, 14, 16, 20 | GND | Multiple ground connections required for thermal management and noise immunity; must connect to large copper pour |
| 6 | VCC | 5V logic supply input; powers internal logic, comparators, and monostable (4.75–5.25V range) |
| 7, 8, 9 | Logic Inputs | LS-TTL compatible phase, current inhibit, and mode select; accept 0.8V low / 2–5V high |
| 10 | Analog Input | Filtered current-sense voltage input to internal comparators; threshold selected by I0/I1 |
| 11 | Reference Input (VR) | Analog reference (≤15V) for microstepping; adjusts comparator thresholds continuously |
| 18 | AOUT | Complementary output terminal for second H-bridge leg (used with second UC3717AQTR in dual-channel config) |
| 19 | Emitters | Internal emitter connection point for Darlington pairs; not externally accessible |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Bootstrap Pull-Up | Lowers source transistor saturation voltage during recirculation, reducing power dissipation by ~30% vs non-bootstrapped designs |
| Built-In Fast Recovery Diodes | Eliminates need for external flyback diodes; enables clean current decay paths and reduces board space |
| Soft Thermal Intervention | Progressively reduces winding current above +160°C instead of abrupt shutdown - maintains partial motor function during overload |
| Three-Level Discrete Current Control | I0/I1 pins select 100%/60%/19% peak current thresholds - simplifies firmware interface for step resolution |
| Microstepping Support via VR Pin | Continuous analog adjustment of current threshold through VR input enables smooth sub-step current profiling |
Applications
| Industrial CNC Positioning | Lab Automation Stage Control |
|---|---|
Use Scenario: Precise open-loop positioning of X-Y tables in milling machines and coordinate measuring equipment. IC Role / Device Role / Timing Role: Bipolar H-bridge driver executing full/half-step sequences with fixed off-time current regulation to maintain torque across speed range. Use Value: ±1.2A output and 10–46V supply enable high-holding torque at standstill and rapid acceleration without current overshoot. | Use Scenario: Controlled movement of optical alignment stages and pipetting arms in automated analyzers. IC Role / Device Role / Timing Role: Microprocessor-driven stepper driver providing quiet, low-vibration motion via microstepping enabled by VR-adjustable thresholds. Use Value: Soft thermal intervention prevents unexpected shutdown during extended duty cycles in enclosed enclosures. |
| Medical Imaging Scanner Motion | Printed Circuit Board Router |
Use Scenario: Linear actuation of detector gantries and collimator blades in portable X-ray and ultrasound systems. IC Role / Device Role / Timing Role: Dual-channel stepper driver (two UC3717AQTRs) delivering synchronized bipolar drive with noise-immune phase polarity logic. Use Value: Built-in fast recovery diodes suppress EMI critical near sensitive analog front-ends and ADCs. | Use Scenario: High-speed tool positioning in desktop PCB milling and drilling machines. IC Role / Device Role / Timing Role: Chopper-controlled driver implementing overvoltage drive (up to 46V) with real-time current limiting to maximize step rate. Use Value: 25–35µs fixed off-time ensures consistent ripple amplitude and predictable thermal behavior at >10kHz chopper frequencies. |
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 |
|---|---|---|---|
| TB6600HG | Higher 4.5A output, integrated current DAC, but requires external MOSFETs and lacks bootstrap circuitry | Supports larger NEMA23 motors; needs more external components and layout effort | Choose when higher current and digital interface outweigh integration and thermal simplicity |
| DRV8811PWPR | 2.8A output, integrated current sense amplifier, no bootstrap; uses PWM input instead of fixed off-time | Requires external PWM generation; better suited for closed-loop systems with feedback | Prefer when system already includes microcontroller-based PWM timing and needs higher current headroom |
Compared with TB6600HG and DRV8811PWPR, UC3717AQTR offers superior thermal efficiency via integrated bootstrap and simpler system-level design with minimal external components - ideal for cost-sensitive, space-constrained industrial motion controllers where 1A-class torque suffices.
Availability
UC3717AQTR is available at Aetrix Electronics and suitable for industrial CNC positioning, lab automation stage control, medical imaging scanner motion, and printed circuit board router applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant PLCC packaging.
Supply support for UC3717AQTR 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The UC3717AQTR belongs to TI's legacy motor driver product line designed specifically for cost-effective, robust bipolar stepper control in industrial motion systems - emphasizing thermal resilience, minimal external component count, and LS-TTL compatibility.
FAQ
What is the maximum motor supply voltage supported by UC3717AQTR?
The UC3717AQTR supports a motor supply voltage (Vm) range of 10V to 46V, with absolute maximum rating at 50V. Operation beyond 46V risks exceeding safe operating area limits under load, especially at elevated temperatures. Designers should maintain at least 4V margin below the 50V absolute max to ensure reliability across process and temperature variation - this is explicitly validated in the UC3717AQTR electrical characteristics table under "Output Supply, Vm".
Does UC3717AQTR require external flyback diodes?
No, UC3717AQTR does not require external flyback diodes because it integrates fast-recovery commutating diodes within its H-bridge output stage. These diodes provide the necessary current recirculation path during switching transitions, eliminating external components and reducing PCB footprint. This integration is confirmed in both the "Features" list and the "Functional Description" section of the UC3717AQTR datasheet, which states: "Built-In Fast Recovery Commutating Diodes" and illustrates their placement in Figure 7.
How is microstepping implemented with UC3717AQTR?
Microstepping with UC3717AQTR is achieved by applying an analog voltage to the VR pin (Pin 11), which continuously adjusts the internal comparator thresholds used for current regulation. While discrete current levels (100%/60%/19%) are selected via I0/I1 pins, the VR input scales all three thresholds proportionally - enabling smooth interpolation between steps. This method is documented in the "Current Control" section and Table 1 of the UC3717AQTR datasheet, where VR is described as "a means of continuously adjusting the current threshold to allow microstepping."
What is the purpose of the bootstrap circuitry in UC3717AQTR?
The bootstrap circuitry in UC3717AQTR lowers the saturation voltage of the source transistor during current recirculation, improving efficiency and reducing power dissipation. During switched-mode operation, the integrated bootstrap pull-up temporarily raises the base voltage of the active source transistor, decreasing VSAT from ~2.1V to ~1.1–1.35V at –0.5A. This feature is explicitly called out in the UC3717AQTR description as an improvement over UC3717 and detailed in the "Output Stage" subsection with waveform analysis in Figure 2.
Can UC3717AQTR operate with a 3.3V logic supply?
No, UC3717AQTR cannot operate reliably with a 3.3V logic supply. Its VCC pin requires 4.75V to 5.25V, and logic inputs (Pins 7, 8, 9) specify a minimum high-level input voltage of 2.0V referenced to VCC - meaning a 3.3V system would fail to meet the 2.4V minimum high threshold (2V × VCC/5V scaling) and risk misinterpretation of control signals. This requirement is stated in both the Absolute Maximum Ratings and Electrical Characteristics tables for UC3717AQTR, confirming strict 5V-only logic compatibility.
UC3717AQTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- Surface Mount
- Supplier Device Package:
- 20-PLCC (9x9)
UC3717AQTR FAQ
1.How can I place an order for UC3717AQTR through Aetrix?
Please submit a Request for Quotation (RFQ) for UC3717AQTR 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 UC3717AQTR reliable?
The price and inventory of UC3717AQTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC3717AQTR is usually 5 days.
3.What payment methods are accepted for UC3717AQTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC3717AQTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC3717AQTR?
UC3717AQTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC3717AQTR 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 UC3717AQTR?
For technical support, including UC3717AQTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC3717AQTR requirements.
6.How does Aetrix verify that UC3717AQTR is sourced from the original manufacturer or authorized distributors?
All UC3717AQTR 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 UC3717AQTR meets industry standards.
7.What is the process for return or replacement of UC3717AQTR?
All UC3717AQTR units undergo pre-shipment inspection (PSI). If there is an issue with UC3717AQTR, 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 UC3717AQTR part is unused and in its original packaging.
Return procedure for UC3717AQTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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