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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Gate Drivers

STMicroelectronics L6571B

Name: L6571B
Brand: STMicroelectronics
SKU: L6571B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L6571B

Manufacturer:: STMicroelectronics

Category:: Gate Drivers

Package:: 8-DIP (0.300", 7.62mm)

Datasheet:: L6571B.pdf

Description:: IC GATE DRVR HALF-BRIDG 8MINIDIP

Quantity:: RFQ Add To RFQ list

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Inventory:4,758

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Product details

Overview

L6571B 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, 0.72 μs typical internal dead time, ±50 V/ns dV/dt immunity, and programmable oscillator frequency via external R_F/C_F. Used in compact AC-DC adapters and offline SMPS.

For engineers reviewing the L6571B datasheet, L6571B pinout, L6571B application, or L6571B equivalent, key selection criteria include verified dead time (0.72 μs), bootstrap voltage tolerance (618 V), sink/source drive strength (270 mA/170 mA), and undervoltage lockout hysteresis (1 V).

Technical Context

The L6571B integrates a self-contained oscillator whose frequency is set by an external resistor (pin 2) and capacitor (pin 3), enabling precise timing control without external clock sources. Its internal logic enforces non-overlapping gate drive signals to prevent shoot-through in half-bridge configurations.

It employs BCD (Bipolar-CMOS-DMOS) off-line technology for robust high-voltage operation, with a 15.6 V Zener clamp on the VS pin and dedicated high-side (HVG) and low-side (LVG) drivers referenced to BOOT and GND respectively. The device supports both oscillator-based and external logic-driven operation via the CF pin.

Key Specifications

Parameter	Value and Actual Design Meaning
High-side voltage rating	618 V max floating supply (BOOT), enabling direct use in 600 V bus applications
Dead time	0.72 μs typical - ensures reliable cross-conduction prevention in fast-switching half-bridges
Driver output current	Sink: 270 mA / Source: 170 mA - sufficient to charge/discharge gate capacitance of medium-power MOSFETs/IGBTs
dV/dt immunity	±50 V/ns - maintains stable operation under high-slew-rate switching noise in noisy power stages
UVLO threshold	Turn-on at 9 V, turn-off at 8 V (1 V hysteresis) - prevents erratic startup during brown-out conditions
Oscillator frequency range	200 kHz max, programmable via R_F/C_F - supports fixed-frequency resonant LLC and flyback designs
Start-up current	150 μA - enables low-power auxiliary supply design with minimal standby loss

Pinout & Package

Available in DIP-8 and SO-8 packages per ST's ECOPACK® compliance. Pin functions are validated per STMicroelectronics Doc ID 4946 Rev 6 (pp.4–5).

Pin/Terminal	Circuit Role	Design Meaning
1 (VS)	Clamped supply input	Internal 15.6 V Zener-clamped rail; powers internal logic and low-side driver
2 (RF)	Oscillator timing resistor node	Provides current source/sink for external R_F; also usable as buffer to drive secondary ICs
3 (CF)	Oscillator timing capacitor / logic input	Accepts external C_F for frequency setting or TTL/CMOS logic signal for external synchronization
4 (GND)	Power and signal reference	Common return for low-side driver, oscillator, and UVLO circuitry
5 (LVG)	Low-side gate driver output	Direct-drive output for N-MOSFET/IGBT source-connected switch; 170 mA source / 270 mA sink
6 (OUT)	High-side floating reference	Connects to source of high-side N-device; defines HVG reference potential during bootstrap operation
7 (HVG)	High-side gate driver output	Drives gate of high-side N-device relative to OUT; same current capability as LVG
8 (BOOT)	Bootstrap supply input	Charged via external diode/capacitor; supplies floating bias for high-side driver stage up to 618 V

Key Features

Feature	Design Value
Integrated oscillator with external R/C programming	Enables standalone half-bridge timing without external clock generator or microcontroller
Programmable dead time (0.72 μs)	Guarantees minimum off-time between high- and low-side conduction to eliminate shoot-through risk
600 V high-side capability with dV/dt immunity	Supports direct integration into 400–600 V DC bus systems without level-shifting or isolation
BCD process technology	Combines high-voltage DMOS with precision CMOS/Bipolar for robustness, efficiency, and thermal stability
Low start-up current (150 μA)	Reduces auxiliary supply burden and improves no-load efficiency in adapter designs

Applications

Compact AC-DC Adapters

LED Driver Ballasts

Use Scenario: 30–60 W offline flyback or resonant converter powering universal-input LED lamps.

IC Role / Device Role / Timing Role: Half-bridge driver controlling primary-side switches; oscillator sets switching frequency at 60 kHz.

Use Value: Eliminates need for external clock IC and reduces component count while maintaining tight dead-time control for EMI compliance.

Use Scenario: Constant-current LED ballast driving multiple series-connected LEDs from rectified mains.

IC Role / Device Role / Timing Role: Gate driver for half-bridge in LLC resonant topology; internal oscillator synchronizes switching with tank resonance.

Use Value: 0.72 μs dead time minimizes conduction overlap losses, improving efficiency above 90% at full load.

Industrial SMPS Modules

Appliance Motor Drivers

Use Scenario: 100–200 W open-frame power supply for PLC I/O modules or sensor interfaces.

IC Role / Device Role / Timing Role: Primary-side half-bridge driver with external R/C tuning for 100 kHz operation and thermal derating margin.

Use Value: ±50 V/ns dV/dt immunity ensures stable operation in electrically noisy industrial environments without false triggering.

Use Scenario: Low-cost BLDC motor pre-driver stage in white goods (e.g., washing machine drum drives).

IC Role / Device Role / Timing Role: Gate driver for discrete N-MOSFET half-bridge; driven by MCU PWM with CF pin override for emergency shutdown.

Use Value: CF pin accepts logic-level shutdown signal, enabling fast fault response (<1 μs) without firmware intervention.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IR2153(D)PbF	No integrated oscillator; requires external RC or crystal; 500 V max BOOT rating	Lacks programmable dead time - relies on external timing network for overlap prevention	Preferred where higher bootstrap voltage (>600 V) is not required and external clock flexibility is needed
UCC27712DR	600 V-rated, no oscillator, 4 A peak drive, 12 ns propagation delay	Designed for high-speed GaN/SiC switching; lacks UVLO hysteresis and Zener clamp on VS	Selected when ultra-fast edge rates and high-current drive outweigh need for integrated timing and protection

Compared with IR2153(D)PbF and UCC27712DR, the L6571B uniquely combines oscillator integration, 618 V BOOT tolerance, and factory-trimmed 0.72 μs dead time - making it optimal for cost-sensitive, self-contained half-bridge SMPS where layout simplicity and reliability are prioritized over maximum switching speed.

Availability

L6571B is available at Aetrix Electronics and suitable for compact AC-DC adapters, LED driver ballasts, and industrial SMPS modules requiring stable component supply, long-lifecycle support, and consistent parametric performance across temperature and voltage ranges.

Supply support for L6571B 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, delivering innovative solutions across automotive, industrial, power, and analog markets since 1987.

The L6571B belongs to ST's high-voltage analog & power IC portfolio, specifically engineered for cost-effective, self-timed half-bridge control in offline power conversion - targeting space-constrained, high-reliability AC-DC and resonant converter designs.

FAQ

What is the maximum allowable bootstrap voltage (V_BOOT) for the L6571B?

The absolute maximum V_BOOT is 618 V, as specified in Table 1 of STMicroelectronics Doc ID 4946 Rev 6. This rating allows direct use with 600 V DC bus systems. Exceeding this voltage risks permanent damage to the high-side driver stage and internal level-shift circuitry.

Can the L6571B be synchronized to an external clock signal?

Yes - the CF pin (pin 3) accepts TTL- or CMOS-compatible logic signals. When driven externally, the internal oscillator is disabled and the device operates in slave mode, with rising/falling edges on CF directly controlling high/low-side output states per the block diagram in Figure 1.

How does the L6571B handle undervoltage lockout (UVLO)?

It implements a hysteresis-based UVLO with turn-on at 9 V (typ.) and turn-off at 8 V (typ.), yielding 1 V hysteresis. The VS pin must rise above 9 V to enable operation; if VS drops below 8 V, both drivers disable and the oscillator halts until re-triggered above 9 V.

Is the L6571B pin-compatible with the L6571A?

Yes - both share identical pinout, package options (DIP-8/SO-8), and functional architecture. The sole difference is internal dead time: L6571A uses 1.25 μs (typ.), while L6571B uses 0.72 μs (typ.). No PCB redesign is needed when substituting between them.

L6571B Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Active

Programmable:: Not Verified

Driven Configuration:: Half-Bridge

Channel Type:: Synchronous

Number of Drivers:: 2

Gate Type:: IGBT, N-Channel MOSFET

Voltage - Supply:: 10V ~ 16.6V

Logic Voltage - VIL, VIH:: -

Current - Peak Output (Source, Sink):: 170mA, 270mA

Input Type:: RC Input Circuit

High Side Voltage - Max (Bootstrap):: 600 V

Rise / Fall Time (Typ):: -

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 8-Mini DIP

L6571B FAQ

1.How can I place an order for L6571B through Aetrix?

Please submit a Request for Quotation (RFQ) for L6571B 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 L6571B reliable?

The price and inventory of L6571B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6571B is usually 5 days.

3.What payment methods are accepted for L6571B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6571B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L6571B?

L6571B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L6571B 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 L6571B?

For technical support, including L6571B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6571B requirements.

6.How does Aetrix verify that L6571B is sourced from the original manufacturer or authorized distributors?

All L6571B 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 L6571B meets industry standards.

7.What is the process for return or replacement of L6571B?

All L6571B units undergo pre-shipment inspection (PSI). If there is an issue with L6571B, 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 L6571B part is unused and in its original packaging.

Return procedure for L6571B:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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