Infineon Technologies TLE4727

Overview

TLE4727 from Infineon Technologies is a monolithic bipolar 2-phase stepper motor driver IC with integrated full-bridge outputs, chopper current control, and on-chip 5 V logic regulator. It delivers 700 mA per phase at up to 16 V supply, supports programmable current modes (hold/normal/accelerate), and features error flagging for open-load, short-circuit, and overtemperature faults. Used in precision motion control for industrial automation actuators and office equipment positioning systems.

For engineers reviewing the TLE4727 datasheet, TLE4727 pinout, TLE4727 application, or TLE4727 equivalent, key selection considerations include its dual full-bridge architecture with offset-phase turn-on, integrated fast free-wheeling diodes, 25 kHz oscillator frequency with external 2.2 nF timing capacitor, and direct microprocessor interface via four digital control inputs (IX0/IX1 per phase).

Technical Context

The TLE4727 implements a fixed-frequency chopper current controller using an internal oscillator (typ. 25 kHz) and external timing capacitor, enabling precise constant-current drive for bipolar stepper windings. Each phase uses independent IX0/IX1 logic inputs to select one of four current levels: zero, 14% I_set, 100% I_set, or 140% I_set, where I_set = 500 mA with 1 Ω sense resistor.

Its dual full-bridge output stages (Q11–Q12 and Q21–Q22) are crossover-current-free and incorporate fast integrated free-wheeling diodes. The device includes thermal shutdown (140 °C trip) with pre-alarm at 120 °C, and a dedicated open-drain error output that asserts low on fault detection-resettable via high-level control input assertion.

Key Specifications

Pinout & Package

P-DIP-20-6 package: 20-pin plastic dual in-line package with 2.54 mm pitch, leadframe-connected ground pins (5, 6, 15, 16), and thermal pad connected to GND for improved heat dissipation in PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bipolar stepper motor driver applications.

Compared with TB6600HG and LV8729V, the TLE4727 offers balanced integration-combining fault diagnostics, on-board regulation, and proven ruggedness for industrial ambient temperatures-without requiring external support components for basic bipolar stepping.

Availability

TLE4727 is available at Aetrix Electronics and suitable for industrial valve actuation, printer paper feed mechanisms, CNC tool changers, and medical infusion pump motor control requiring stable component supply across extended production lifecycles.

Supply support for TLE4727 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

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive ICs, and industrial control solutions, with global manufacturing and quality certification to ISO/TS 16949 and IECQ QC 080000.

The TLE4727 belongs to Infineon's TLE family of automotive-qualified motor driver ICs, designed specifically for robust, fault-tolerant bipolar stepper control in harsh industrial and transportation environments.

FAQ

What is the maximum allowable supply voltage for continuous operation?

The TLE4727 operates continuously at 5–16 V supply voltage. Its absolute maximum rating is 45 V, but sustained operation above 16 V risks exceeding thermal limits and violating the specified output current derating curve. Industrial designs must maintain VS ≤16 V with proper heatsinking and decoupling to ensure reliability over 10,000 hours.

How does the error flag indicate specific fault types?

The open-drain ERR pin goes low for any of three conditions: open-load (no current path detected), short-circuit to ground on any output, or junction temperature ≥140 °C. To isolate the fault, assert high on all IX0/IX1 inputs to reset the flag, then sequentially enable each bridge while monitoring ERR-low assertion during a single-phase test identifies the faulty winding or connection.

Can the TLE4727 drive unipolar stepper motors?

No-the TLE4727 is designed exclusively for bipolar stepper motors with center-tapped or dual-winding configurations requiring full-bridge current reversal. Its output architecture lacks the half-bridge topology and phase-enable logic needed for unipolar 5-lead or 6-lead motor wiring. Attempting unipolar use results in incorrect commutation and potential device damage.

What is the role of the 2.2 nF capacitor on Pin 4?

The 2.2 nF capacitor between Pin 4 (OSC) and ground sets the chopper oscillator frequency to approximately 25 kHz. This timing determines current regulation loop speed-higher values reduce frequency and increase ripple; lower values raise frequency and improve current stability but increase switching losses. Deviation beyond ±10% shifts chopper behavior outside guaranteed specs.