Texas Instruments TL1451ACPWR/1A

Overview

TL1451ACPWR/1A from Texas Instruments is a dual PWM control IC designed for synchronous power-supply regulation, integrating two error amplifiers, an adjustable oscillator (up to 500 kHz), internal 2.5-V reference, undervoltage lockout, short-circuit protection, and dual common-emitter output transistors. It operates from –20°C to 85°C and supports variable dead-time control across 0%–100% range.

For engineers reviewing the TL1451ACPWR/1A datasheet, TL1451ACPWR/1A pinout, TL1451ACPWR/1A application, or TL1451ACPWR/1A equivalent, key selection criteria include its dual-output PWM architecture, internal 2.5-V reference stability (±1% over temperature), oscillator frequency programmability via RT/CT, undervoltage lockout thresholds (2.6 V / 2.72 V), and common-emitter output capability for gate driving in DC-DC converters.

Technical Context

The TL1451ACPWR/1A implements fully synchronized dual PWM control with independent feedback paths and shared oscillator timing. Its internal 2.5-V reference supplies both error amplifiers, which feature a 1.05–1.45 V common-mode input range and 70–80 dB open-loop gain.

Dead-time control is achieved via dedicated DTC comparators with externally adjustable thresholds (1.2–2.25 V), enabling precise overlap prevention between complementary outputs. Undervoltage lockout engages below 2.6 V on VCC and releases at 2.72 V, providing hysteresis of 80–120 mV to prevent chatter during brownout conditions.

Key Specifications

Pinout & Package

TSSOP-16 (PW) package: 4.4 mm × 5.0 mm body, 0.65 mm pitch, 16-pin surface-mount with exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual PWM control applications.

Compared with UC3846N and TL5001CPW, TL1451ACPWR/1A uniquely delivers true dual independent PWM control with per-channel dead-time adjustment and fully synchronized timing-critical for high-efficiency, low-EMI dual-output power supplies where channel interaction must be precisely managed.

Availability

TL1451ACPWR/1A is available at Aetrix Electronics and suitable for industrial AC-DC power supplies, automotive DC-DC converters, and telecom rectifier modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TL1451ACPWR/1A 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The TL1451A product line was engineered for high-reliability dual-output switch-mode power supply control, emphasizing synchronization integrity, thermal robustness, and integrated protection features for mission-critical power conversion.

FAQ

What is the maximum oscillator frequency supported by TL1451ACPWR/1A?

The TL1451ACPWR/1A supports an oscillator frequency up to 500 kHz, set by external RT and CT components. At typical operating conditions (RT = 10 kΩ, CT = 330 pF), it achieves 200 kHz with ±2% variation over temperature. The upper limit is constrained by internal comparator propagation delays and oscillator circuit bandwidth.

Does TL1451ACPWR/1A include an internal voltage reference, and what is its accuracy?

Yes, TL1451ACPWR/1A integrates a 2.5-V internal reference with ±1% initial accuracy over temperature (–20°C to 85°C). Output voltage change is specified as ±0.2% from 25°C to 85°C and ±0.1% from –20°C to 25°C, making it suitable for precision feedback without external reference ICs.

How does the undervoltage lockout (UVLO) function in TL1451ACPWR/1A?

The TL1451ACPWR/1A UVLO activates when VCC falls below 2.6 V (typical), disabling outputs until VCC rises above 2.72 V (typical). Hysteresis of 80–120 mV prevents oscillation near the threshold. This ensures clean startup and protects downstream circuitry during brownout events.

Can TL1451ACPWR/1A drive MOSFET gates directly?

No, TL1451ACPWR/1A provides common-emitter NPN open-collector outputs (pins 7 and 15) that sink up to 20 mA each. Direct MOSFET gate drive requires external pull-up resistors or dedicated gate drivers; the outputs are intended to interface with discrete transistors or driver ICs-not logic-level MOSFETs.

What is the purpose of the SCP pin (pin 10) on TL1451ACPWR/1A?

The SCP (Short-Circuit Protection) pin on TL1451ACPWR/1A is an active-low fault input. When pulled below 0.65–0.75 V, it latches the outputs off. Recovery requires cycling VCC below the reset threshold (1.5–1.9 V), ensuring persistent shutdown during overcurrent events until system-level intervention occurs.