STMicroelectronics L6235PD013TR

Overview

L6235PD013TR from STMicroelectronics is a fully integrated DMOS 3-phase brushless DC motor driver IC with embedded PWM current control, hall-effect sensor decoding logic (60°/120°), non-dissipative overcurrent protection, tachometer output, and brake function. It operates from 8–52 V supply, delivers 5.6 A peak (2.8 A DC) output current per phase, features 0.34 Ω typ. high-side R_DS(ON) at 25 °C, and supports up to 100 kHz switching frequency - used in closed-loop BLDC motor control for industrial fans, power tools, and HVAC blowers.

For engineers reviewing the L6235PD013TR datasheet, L6235PD013TR pinout, L6235PD013TR application, or L6235PD013TR equivalent, key selection criteria include its constant t_OFF PWM controller timing (set via RCOFF/COFF), synchronous slow-decay rectification, diagnostic open-drain output (DIAG), and dual-package compatibility (PowerSO36/SO24) with thermal resistance as low as 1 °C/W (junction-to-case).

Technical Context

The L6235 integrates six DMOS power transistors in a 3-phase bridge with intrinsic fast freewheeling diodes, driven by CMOS/bipolar logic on BCD technology. Its hall decoding logic accepts single-ended H1/H2/H3 inputs and generates commutation sequences for both 60° and 120° electrical spacing, while cross-conduction protection enforces 1 µs deadtime between high- and low-side FET switching.

Current regulation uses a constant off-time PWM controller sensing voltage across external sense resistors (SENSEA/SENSEB), with blanking time (1 µs) to suppress reverse-recovery spikes. The tachometer output (TACHO) provides fixed-width pulses synchronized to H1 transitions, and non-dissipative overcurrent detection triggers DIAG assertion without external shunt dissipation.

Key Specifications

Pinout & Package

Available in PowerSO36 (exposed slug, R_th(j-case) = 1 °C/W) and SO24 (20+2+2 pin count) packages. Both support high-current routing and thermal transfer via GND pins (1,18,19,36 in PowerSO36; 6,7,18,19 in SO24), with slug internally connected to GND.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 3-phase BLDC motor driver applications.

Compared with STSPIN32F0A and TB6605FTG, the L6235PD013TR uniquely combines hall-based commutation, non-dissipative OCP, hardware tach output, and brake functionality in a single IC - making it optimal for deterministic, sensor-based BLDC systems requiring minimal MCU overhead and robust fault handling.

Availability

L6235PD013TR is available at Aetrix Electronics and suitable for industrial fan control, power tool motor drive, automotive HVAC blower, and conveyor belt actuator applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for L6235PD013TR 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

STMicroelectronics is a global semiconductor leader specializing in power management, motor control, and automotive-grade ICs, with manufacturing aligned to ISO/TS 16949 and environmental standards including RoHS and REACH.

The L6235 belongs to ST's high-voltage motor driver product line, designed specifically for cost-effective, highly integrated 3-phase BLDC control in industrial and consumer equipment where reliability, thermal performance, and diagnostic capability are critical.

FAQ

What is the purpose of the RCOFF and RCPULSE pins?

RCOFF sets the PWM off-time duration via an external RC network to control current recirculation period in constant t_OFF mode; RCPULSE sets tachometer pulse width using another RC network. Both pins source 3.5–5.5 mA, allowing direct connection to resistor-capacitor pairs without buffering. Typical values are R = 20 kΩ/C = 1 nF for 13 µs t_OFF and 12 µs tach pulse.

How does the non-dissipative overcurrent protection work?

It monitors high-side MOSFET conduction voltage (V_DS) during active switching - triggering DIAG assertion when instantaneous current exceeds 4.0–7.1 A (depending on junction temperature). No external sense resistor is needed, eliminating power loss and PCB footprint associated with shunt-based detection.

Can the L6235PD013TR operate without external bootstrap components?

No - external bootstrap components are mandatory: a 22 nF capacitor (C_BOOT) between VBOOT and OUTx, a 10 nF capacitor (C_P) and 100 Ω resistor (R_P) between VCP and VBOOT, plus two 1N4148 diodes. These form the charge pump enabling gate drive above V_S for high-side N-MOSFETs.

What hall sensor configurations does the decoding logic support?

The L6235 supports both 60° and 120° electrical spacing between hall sensors, automatically detecting configuration based on input sequence timing. It accepts single-ended (ground-referenced) TTL/CMOS hall outputs - no differential receivers or level-shifting required - and generates correct 3-phase commutation signals internally.