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

Texas Instruments UC2726N

Name: UC2726N
Brand: Texas Instruments
SKU: UC2726N
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: UC2726N

Manufacturer:: Texas Instruments

Category:: Gate Drivers

Package:: -

Datasheet:: UC2726N.pdf

Description:: IC PERIPHERAL DRIVER HALF BRIDGE

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Product details

Overview

UC2726N from Texas Instruments is an isolated drive transmitter IC designed to transmit gate drive logic and power across a low-cost pulse transformer for high-side IGBT control in H-bridge topologies. It delivers 750mA source/sink output drive, operates from 8–35V VCC, supports up to 750kHz switching frequency, and integrates programmable fault detection with user-defined timing via CF/RT/CT components - enabling robust, jitter-minimized gate drive in industrial motor drives.

For engineers reviewing the UC2726N datasheet, UC2726N pinout, UC2726N application, or UC2726N equivalent, key selection considerations include its dual totem-pole output architecture (OUTA/OUTB), transformer-coupled fault feedback interface with UC1727, shutdown mode for <2.5mA standby current, external VL biasing capability, and DIP-16 package compatibility with legacy high-voltage isolation layouts.

Technical Context

The UC2726N implements duty-cycle modulation to encode drive commands across isolation, enabling instantaneous response to PHI input transitions while reliably sustaining DC-level drive states. Its internal one-shot circuit (TPW ≈ 1.1·RT·(CT + 50pF)) sets precise timing for transformer primary excitation and fault window generation.

Fault detection uses a retriggerable monostable triggered by the FAULT pin, with timing set by CF and RT (t ≈ 2.1·CF·RT); valid faults require sustained high level across the full window before latching FLATCH. The IC supports dual supply operation: VCC powers outputs and internal reference, while external VL (4.2–4.6V nominal) can bias logic to reduce total dissipation.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Drive	750mA sink/source per output - sufficient to directly drive transformer primary of isolated IGBT gate circuits without external buffers
Supply Range	8–35V VCC - compatible with industrial bus voltages and ensures interoperability with UC1727's UVLO threshold (~7.1V)
Max Operating Frequency	750kHz - enables use of compact, low-cost pulse transformers with minimal size and leakage inductance
Fault Timing Range	3.0–17.0µs (CF = 330pF to 2.2nF) - configurable rejection window to suppress transient noise false triggers
Shutdown Current	2.5mA typical - reduces system standby power when gate drive is inactive in intermittent-operation systems
Logic Reference Voltage	4.4V internal VL - provides stable bias for timing and fault comparators independent of VCC variation
Output Rise/Fall Time	30–60ns (no load) - ensures fast edge integrity for high-frequency transformer coupling and minimal propagation skew

Pinout & Package

UC2726N is housed in a 16-pin plastic dual in-line package (PDIP-N), with GND (Pin 1), CT (Pin 2), N/C (Pins 3–4), RT (Pin 5), SHTDWN (Pin 6), VL (Pin 7), VCC (Pin 8), N/C (Pin 9), PVCC (Pin 10), OUTB (Pin 11), PGND (Pins 12–14), GND (Pin 15), OUTA (Pin 16). Pins 3–4, 9, and 12–14 are internally connected or unused; PGND is bonded separately from signal GND for output-stage isolation.

Pin/Terminal	Circuit Role	Design Meaning
GND (1, 15)	Signal & substrate ground reference	Provides common return for logic and internal reference; electrically isolated from PGND to prevent ground-loop coupling into transformer drive path
CT (2)	Timing capacitor connection	Sets operating frequency via charge/discharge cycle; requires 75pF–2.0nF capacitor to GND for 170kHz–750kHz range
RT (5)	Timing resistor connection	Sets CT and CF charging currents (ICT = ICF = VL/4RT); 2.4kΩ–200kΩ range enables wide frequency and fault timing adjustment
SHTDWN (6)	Logic shutdown enable	TTL-high input disables internal voltage reference, reducing supply current to 2.5mA - critical for energy-sensitive standby modes
VL (7)	External logic supply input	Accepts 4.75–5.25V external bias to replace internal 4.4V reference, lowering total power dissipation in thermally constrained designs
VCC (8)	Main supply input	Bias source for output drivers and internal circuitry; must exceed 28V for reliable UC1727 compatibility due to UC1727's VDD requirements
PVCC (10)	Output transistor supply	In DIP-16, bonded internally to VCC; supplies totem-pole output stage - decoupling here minimizes switching noise on logic rails
OUTA / OUTB (11, 16)	Dual complementary totem-pole outputs	Drive opposite ends of transformer primary; phase relationship encodes PHI command - OUTA high/OUTB low = "on", vice versa = "off"
PGND (12–14)	Power ground for output transistors	Separate bond pad for output-stage return; prevents logic ground contamination during high di/dt switching events
PHI (17)	Primary logic control input	Direct TTL/CMOS-compatible gate command input; rising/falling edges modulate duty cycle across transformer to convey drive state to UC1727
FAULT (24)	Fault signal input from UC1727	Receives isolated fault indication; high-valid signal initiates programmable timer - only sustained assertion triggers FLATCH
FRESET (23)	Fault latch reset input	Active-low asynchronous reset; toggling from low→high clears FLATCH and resumes gate transmission after fault recovery
FLATCH (22)	Fault status output	Open-collector logic-high output when valid fault detected - used to disable upstream PWM or trigger system-level fault handling
CF (26)	Fault timing capacitor input	Defines fault validation window (t ≈ 2.1·CF·RT); 75pF–3.0nF range allows µs-scale noise immunity tuning

Key Features

Feature	Design Value
Duty-cycle modulation encoding	Enables lossless transmission of both logic state and steady-state (DC) commands across transformer isolation without data loss or drift
Programmable fault timing	Allows designers to reject sub-microsecond transients (e.g., EMI spikes) while responding to genuine overcurrent or desaturation faults
External VL biasing option	Reduces total power dissipation by bypassing internal 4.4V regulator - especially valuable in thermally limited high-density motor drive PCBs
Transformer-coupled fault feedback	Eliminates need for optocouplers or separate isolation channels, cutting BOM cost and board space in dual-chip IGBT driver systems
Low-jitter output control algorithm	Minimizes timing uncertainty in gate drive edges - critical for maintaining precise dead-time control and preventing shoot-through in H-bridges

Applications

Industrial Motor Drives	Uninterruptible Power Supplies (UPS)
Use Scenario: Driving high-side IGBTs in three-phase inverter stages of servo and VFD systems operating at 400–690V DC bus. IC Role / Device Role / Timing Role: Isolated drive transmitter that encodes PWM logic and power across transformer to UC1727, synchronizing gate turn-on/off with microcontroller timing. Use Value: Enables precise, jitter-free gate drive at up to 750kHz - supporting high-efficiency SiC/GaN-compatible switching frequencies while maintaining safe isolation.	Use Scenario: Controlling bidirectional IGBT bridges in online double-conversion UPS inverters requiring galvanic isolation between control and power domains. IC Role / Device Role / Timing Role: Transmits gate commands and receives fault signals across isolation barrier using single pulse transformer - eliminating optocoupler latency and aging concerns. Use Value: Fault detection with user-programmable timing (3–17µs) prevents nuisance tripping during line transients while ensuring rapid shutdown during true overloads.
Solar Inverters	Induction Heating Systems
Use Scenario: High-voltage string inverters where high-side IGBTs switch at 16–20kHz with strict isolation requirements between MCU and 1000V+ DC link. IC Role / Device Role / Timing Role: Provides transformer-isolated gate drive with integrated fault feedback loop - reducing component count versus discrete opto + gate driver solutions. Use Value: 750mA peak drive current ensures fast IGBT turn-on even with high Miller capacitance, minimizing conduction losses at high power levels.	Use Scenario: Resonant half-bridge inverters driving induction coils at 20–100kHz, demanding robust fault handling under rapid thermal stress and load mismatches. IC Role / Device Role / Timing Role: Generates complementary totem-pole outputs (OUTA/OUTB) to drive transformer primary, encoding PHI logic into duty-modulated waveform for UC1727 decoding. Use Value: Shutdown mode (<2.5mA) allows low-power idle state during standby cycles - extending system efficiency in intermittent-duty heating applications.

Industrial Motor Drives

Uninterruptible Power Supplies (UPS)

Use Scenario: Driving high-side IGBTs in three-phase inverter stages of servo and VFD systems operating at 400–690V DC bus.

IC Role / Device Role / Timing Role: Isolated drive transmitter that encodes PWM logic and power across transformer to UC1727, synchronizing gate turn-on/off with microcontroller timing.

Use Value: Enables precise, jitter-free gate drive at up to 750kHz - supporting high-efficiency SiC/GaN-compatible switching frequencies while maintaining safe isolation.

Use Scenario: Controlling bidirectional IGBT bridges in online double-conversion UPS inverters requiring galvanic isolation between control and power domains.

IC Role / Device Role / Timing Role: Transmits gate commands and receives fault signals across isolation barrier using single pulse transformer - eliminating optocoupler latency and aging concerns.

Use Value: Fault detection with user-programmable timing (3–17µs) prevents nuisance tripping during line transients while ensuring rapid shutdown during true overloads.

Solar Inverters

Induction Heating Systems

Use Scenario: High-voltage string inverters where high-side IGBTs switch at 16–20kHz with strict isolation requirements between MCU and 1000V+ DC link.

IC Role / Device Role / Timing Role: Provides transformer-isolated gate drive with integrated fault feedback loop - reducing component count versus discrete opto + gate driver solutions.

Use Value: 750mA peak drive current ensures fast IGBT turn-on even with high Miller capacitance, minimizing conduction losses at high power levels.

Use Scenario: Resonant half-bridge inverters driving induction coils at 20–100kHz, demanding robust fault handling under rapid thermal stress and load mismatches.

IC Role / Device Role / Timing Role: Generates complementary totem-pole outputs (OUTA/OUTB) to drive transformer primary, encoding PHI logic into duty-modulated waveform for UC1727 decoding.

Use Value: Shutdown mode (<2.5mA) allows low-power idle state during standby cycles - extending system efficiency in intermittent-duty heating applications.

Equivalent & Alternatives

The following parts are listed as comparable options for similar isolated gate drive transmitter applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
UCC27262DWP	Modern 28-pin SOIC variant with enhanced ESD rating (±6kV HBM), integrated bootstrap diode, and wider 5–20V logic supply range; lacks CF/FAULT/FLATCH pins - no built-in fault feedback	Designed for self-contained half-bridge drivers with integrated high-side bootstrap; not paired with companion fault-monitoring chip like UC1727	Select UCC27262DWP only if fault feedback is handled externally or omitted; requires redesign of transformer interface and fault logic
ADuM4223BRIZ	Digital isolated gate driver with integrated 2.5kVrms isolation, 4A peak output, and fixed 3.3/5V logic interface; no programmable fault timing or transformer-based architecture	Targets direct-drive applications with digital isolators; no companion chip dependency - eliminates UC1727 pairing requirement but increases per-channel cost	Choose ADuM4223BRIZ for simplified layout and higher drive strength where transformer coupling is undesirable and isolation rating exceeds 2.5kVrms

Compared with UCC27262DWP and ADuM4223BRIZ, UC2726N offers unique transformer-coupled, dual-chip fault-aware architecture optimized for cost-sensitive, high-reliability H-bridge IGBT systems - retaining legacy DIP-16 footprint while delivering programmable fault rejection and ultra-low standby power.

Availability

UC2726N is available at Aetrix Electronics and suitable for industrial motor drives, uninterruptible power supplies, solar inverters, and induction heating systems requiring stable component supply despite its obsolete status - supported via verified legacy stock and traceable sourcing.

Supply support for UC2726N 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 leader specializing in analog, embedded processing, and power management technologies, serving industrial, automotive, and communications markets since 1930.

The UC2726N belongs to TI's legacy isolated gate drive transmitter product line, engineered specifically for transformer-coupled, high-voltage H-bridge IGBT control with integrated fault monitoring - targeting cost-optimized, high-reliability power conversion systems.

FAQ

What is the primary function of the UC2726N in an isolated gate drive system?

The UC2726N serves as the isolated drive transmitter that sends gate control logic and power across a pulse transformer to the UC1727 high-side IGBT driver. It encodes PHI input commands into duty-modulated waveforms, generates complementary totem-pole outputs (OUTA/OUTB), and monitors fault signals returned from UC1727 via the FAULT pin - making it the control-side counterpart in a two-chip isolated driver solution.

Can the UC2726N operate without the UC1727 companion chip?

No - the UC2726N is designed exclusively for use with the UC1727 Isolated High Side IGBT Driver. Its outputs drive the transformer primary, and its fault logic expects signals from UC1727's FAULT output. While basic oscillator operation may occur standalone, functional gate drive and fault protection require the UC1727 pair; the datasheet does not specify or guarantee autonomous operation.

What is the purpose of the VL pin on the UC2726N, and how does it affect power dissipation?

The VL pin on the UC2726N accepts an external 4.75–5.25V logic supply to replace the internal 4.4V reference, reducing total power dissipation by bypassing the on-chip regulator. When VL is externally supplied, logic circuitry draws current from VL instead of VCC, lowering overall thermal load - particularly beneficial in compact, thermally constrained motor drive PCBs where the UC2726N operates alongside high-power IGBTs.

How does the UC2726N implement fault detection, and what components define its timing window?

The UC2726N implements fault detection using a retriggerable monostable triggered by the FAULT pin. Its timing window is defined by the external capacitor CF and resistor RT, with duration approximated as t ≈ 2.1·CF·RT. Valid faults require the FAULT pin to remain high across the entire window - rejecting short transients - before setting FLATCH and disabling gate transmission until FRESET is asserted.

Why does the UC2726N specify a minimum VCC of 8V but recommend >28V in practice?

The UC2726N specifies 8–35V VCC for internal operation, but recommends >28V to ensure compatibility with the UC1727's VDD requirements and undervoltage lockout (UVLO) threshold of ~7.1V. Lower VCC risks insufficient headroom for UC1727's internal regulation and may cause premature UVLO triggering or reduced drive strength - hence the 28V+ recommendation reflects system-level interoperability, not UC2726N alone.

UC2726N Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Programmable:: -

Driven Configuration:: -

Channel Type:: -

Number of Drivers:: -

Gate Type:: -

Voltage - Supply:: -

Logic Voltage - VIL, VIH:: -

Current - Peak Output (Source, Sink):: -

Input Type:: -

High Side Voltage - Max (Bootstrap):: -

Rise / Fall Time (Typ):: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

UC2726N FAQ

1.How can I place an order for UC2726N through Aetrix?

Please submit a Request for Quotation (RFQ) for UC2726N 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 UC2726N reliable?

The price and inventory of UC2726N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC2726N is usually 5 days.

3.What payment methods are accepted for UC2726N?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC2726N transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for UC2726N?

UC2726N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your UC2726N 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 UC2726N?

For technical support, including UC2726N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC2726N requirements.

6.How does Aetrix verify that UC2726N is sourced from the original manufacturer or authorized distributors?

All UC2726N 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 UC2726N meets industry standards.

7.What is the process for return or replacement of UC2726N?

All UC2726N units undergo pre-shipment inspection (PSI). If there is an issue with UC2726N, 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 UC2726N part is unused and in its original packaging.

Return procedure for UC2726N:

1.Submit a request within 90 days.

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

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