Texas Instruments TL1451AEVM-166

Overview

TL1451AEVM-166 from Texas Instruments is a fully assembled, tested dual-output buck converter evaluation module based on the TL1451A dual-channel PWM controller IC. It delivers 3.3 V @ 1.5 A and 1.8 V @ 1 A from a 4.5–5.5 V input, operating at 300 kHz nominal switching frequency with ≤0.02% line regulation and ≤0.7% load regulation.

For engineers reviewing the TL1451AEVM-166 datasheet, TL1451AEVM-166 pinout, TL1451AEVM-166 application, or TL1451AEVM-166 equivalent, this EVM enables rapid validation of dual-rail power delivery for FPGA core/I/O supplies, DSP subsystems, and low-voltage microprocessor auxiliary rails under real-world transient and efficiency conditions.

Technical Context

The TL1451AEVM-166 implements two independent synchronous buck stages using external P-channel MOSFETs (Q4/Q5: IRLMS6802) and Schottky diodes (D4/D5), controlled by the TL1451ACNS SOP-16 PWM IC. Each channel features dedicated feedback (FB1/FB2), duty-cycle control (DTC1/DTC2), and current-sense protection (SCP).

It uses discrete RC timing components (R13/C6) to set oscillator frequency at 300 kHz ±15%, supports soft-start via external capacitor (typ. 0.6–1 ms rise time), and provides shutdown capability via J4 enable signal - all verified across input voltage (4.5–5.5 V), load (0–1.5 A/0–1 A), and thermal conditions without forced air cooling.

Key Specifications

Availability

TL1451AEVM-166 is available at Aetrix Electronics and suitable for FPGA power validation, DSP subsystem prototyping, and low-voltage microprocessor auxiliary rail development requiring stable component supply, pre-validated layout, and documented test data.

Supply support for TL1451AEVM-166 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 specializing in analog, embedded processing, and power management technologies, with decades of leadership in power conversion IC design and application support.

The TL1451AEVM-166 belongs to TI's Power Management Evaluation Modules product line, designed to accelerate development of dual-output DC-DC solutions for digital system power architecture validation and optimization.

FAQ

What is the primary function of the TL1451AEVM-166?

The TL1451AEVM-166 is an evaluation module-not a standalone IC-that demonstrates a dual-output buck converter implementation using the TL1451A PWM controller. It delivers regulated 3.3 V and 1.8 V outputs from a 4.5–5.5 V input, enabling engineers to validate power delivery performance, efficiency, and transient response before custom design. The TL1451AEVM-166 includes complete schematics, board layout, BOM, and measured test data per SLVU043.

Does the TL1451AEVM-166 include the TL1451A controller IC?

Yes, the TL1451AEVM-166 integrates the TL1451ACNS dual-channel PWM controller in an SOP-16 package (U1), along with all supporting passives, power MOSFETs (IRLMS6802), Schottky diodes (B340, DL5817), and magnetics (CTGS75-150K, CTGS75-270K). The module is fully assembled and tested per TI's SLVP166 reference design.

Can the output voltages of the TL1451AEVM-166 be adjusted?

Yes, the TL1451AEVM-166 output voltages are set by resistor dividers (R1/R2 for VO1, R8/R12 for VO2) per the TL1451A feedback architecture. The user's guide explicitly states that R2 and R12 should be modified-not R1 or R8-to preserve compensation network integrity when adjusting VO1 or VO2. This allows reconfiguration for other common rails like 2.5 V or 1.2 V.

What is the maximum achievable efficiency of the TL1451AEVM-166?

The TL1451AEVM-166 achieves 85.6% peak efficiency at full load (5 V input, 3.3 V/1.5 A + 1.8 V/1 A), resulting in 1.12 W total onboard power loss. This value was measured under controlled lab conditions and reflects real-world thermal performance-no forced air cooling is required at room temperature, confirming suitability for thermally constrained embedded applications.

Is the TL1451AEVM-166 compatible with other TL1451A-based designs?

Yes, the TL1451AEVM-166 implements the SLVP166 reference design documented in TI's SLVU043 user's guide and directly uses the TL1451ACNS controller. Its schematic, bill of materials, and layout files serve as a validated starting point for derivative designs. Engineers can reuse component selection, compensation strategy, and PCB layout guidelines from the TL1451AEVM-166 when developing custom TL1451A-based power supplies.