STMicroelectronics L6571AD013TR

Overview

L6571AD013TR from STMicroelectronics is a high-voltage half-bridge gate driver IC with integrated oscillator, designed to drive external N-channel MOSFETs and IGBTs in resonant or hard-switched topologies. It features 600 V high-side floating supply capability, programmable oscillator frequency (up to 200 kHz), 1.25 μs internal dead time (L6571A variant), ±50 V/ns dV/dt immunity, and 15.6 V Zener clamp on VS - used in compact AC-DC flyback and half-bridge SMPS.

For engineers reviewing the L6571AD013TR datasheet, L6571AD013TR pinout, L6571AD013TR application, or L6571AD013TR equivalent, key selection criteria include bootstrap-based high-side drive architecture, dual-sink/source current capability (270 mA sink / 170 mA source), undervoltage lockout with hysteresis, and SO-8 package compatibility for space-constrained power stages.

Technical Context

The device integrates a self-oscillating timing circuit whose frequency is set by external R_F and C_F, supporting both free-running and externally synchronized operation via the CF pin. Internal logic enforces non-overlapping gate drive with fixed dead time (1.25 μs typ. for L6571A) to prevent shoot-through in half-bridge configurations.

High-side drive operates from a bootstrap-supplied floating rail (V_BOOT up to 618 V), referenced to the switching node (OUT), while low-side output (LVG) is ground-referenced. The VS pin includes a 15.6 V Zener clamp and UVLO with 1 V hysteresis, ensuring robust start-up and brown-out protection.

Key Specifications

Pinout & Package

Package: SO-8 (ECOPACK® compliant, RoHS-compliant surface-mount package with standard 1.27 mm pitch).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage half-bridge driver applications.

Compared with IR2153(D)PbF and UCC27712DR, L6571AD013TR offers integrated oscillator functionality and tighter dead-time control (1.25 μs) at lower gate drive strength - making it optimal for cost-sensitive, medium-power SMPS where simplicity and board-area reduction outweigh ultra-high-speed requirements.

Availability

L6571AD013TR is available at Aetrix Electronics and suitable for industrial power supplies, LED drivers, and consumer AC-DC adapters requiring stable component supply, long-lifecycle support, and RoHS-compliant SO-8 packaging.

Supply support for L6571AD013TR 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 headquartered in Geneva, Switzerland, specializing in power management, analog, microcontrollers, and automotive-grade ICs.

L6571AD013TR belongs to ST's high-voltage power driver product line, engineered for cost-effective, self-contained half-bridge control in offline SMPS - emphasizing integration, reliability, and ease of use in non-isolated topologies.

FAQ

What is the function of the CF pin beyond oscillator timing?

The CF pin serves a dual role: it sets oscillator frequency with C_F, and functions as a logic input for external control. Pulling CF to GND forces low-side ON and high-side OFF - a hardware shutdown mode useful for overcurrent or thermal fault responses. This behavior is explicitly defined in the datasheet's "Oscillator frequency" section and verified in Figure 4 waveforms.

Can L6571AD013TR drive 600 V GaN HEMTs?

No - L6571AD013TR is not recommended for GaN HEMTs. Its 170 mA source / 270 mA sink capability and ~100 ns typical rise/fall times (per Figure 6) are optimized for silicon MOSFETs and IGBTs. GaN devices require faster edge rates, higher peak currents (>1 A), and tighter propagation delay matching - characteristics not supported by this driver's architecture or BCD process.

How does the VS pin Zener clamp interact with external supply design?

The VS pin contains an internal 15.6 V Zener (14.6–16.6 V range) that clamps overvoltage but requires careful external supply design. As noted in Table 1 footnote, the supply must not be a low-impedance DC source - instead, a high-impedance resistor or auxiliary winding-derived supply is mandatory to avoid excessive power dissipation in the clamp and ensure reliable start-up at 150 μA.

Is BOOT pin voltage rating absolute or differential?

The BOOT pin rating is differential: V_BOOT ≤ 618 V relative to GND, and V_BOOT–V_OUT ≤ 18 V (per Table 1). This means the bootstrap capacitor must withstand both the high-side floating voltage and the voltage swing across the switching node. Exceeding either limit risks latch-up or permanent damage - confirmed in Absolute Maximum Ratings section 1.1.