Diodes Incorporated PAM8965-EVM

Overview

PAM8965-EVM from Diodes Incorporated is an evaluation module for the PAM8965 12W stereo Class-D audio amplifier with integrated synchronous boost converter, external audio feedback capability, spread-spectrum modulation (SSM), and thermal foldback. It supports 2×12W into 4Ω at 7.4V battery input, achieves 92% system efficiency, and enables Kelvin speaker connection via LFBP/LFBN and RFBP/RFBN pins. Designed for rapid prototyping of portable Bluetooth speakers and wireless audio systems.

For engineers reviewing the PAM8965-EVM datasheet, PAM8965-EVM pinout, PAM8965-EVM application, or PAM8965-EVM equivalent, this page delivers verified functional context, board-level interface details, supported supply configurations (1SxP/2SxP), EMI mitigation methods using SSM, and guidance on leveraging external feedback for fidelity-critical audio designs.

Technical Context

The PAM8965-EVM implements the full reference design for the PAM8965 IC, including its dual-channel Class-D H-bridge topology, integrated 768kHz synchronous boost converter operating in PWM/PFM modes, and differential audio input stage with programmable gain (6–26dB in 0.5dB steps). The board routes all critical feedback paths (LFBP/LFBN/RFBP/RFBN) to accessible test points for external network customization.

It exposes EN, SSM, GAIN, and PLIM control signals to headers for dynamic configuration; supports VBAT1/VBAT2 dual-battery inputs; provides dedicated PVDD decoupling per channel; and implements thermal pad grounding per W-QFN5050-40 layout guidelines. The FLT pin is routed to an LED indicator for real-time fault monitoring (UVLO/OVLO/OTP/SCP/DC).

Key Specifications

Availability

PAM8965-EVM is available at Aetrix Electronics and suitable for portable electronics development, Bluetooth speaker reference design validation, and wireless audio subsystem integration requiring stable component supply and fast-turn evaluation support.

Supply support for PAM8965-EVM 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-efficiency power management, signal integrity, and audio solutions for consumer, industrial, and automotive markets.

The PAM8965-EVM belongs to Diodes' audio power amplifier evaluation platform family, engineered to accelerate adoption of their integrated Class-D + boost architectures in battery-powered, EMI-sensitive, and space-constrained audio applications.

FAQ

What is the primary purpose of the PAM8965-EVM?

The PAM8965-EVM is a fully assembled and tested evaluation board designed to demonstrate and validate the performance of the PAM8965 stereo Class-D audio amplifier IC. It provides immediate access to all key interfaces-including VBAT1/VBAT2 inputs, EN/SSM/GAIN/PLIM controls, L/R audio outputs, and external feedback pins-enabling rapid characterization of output power, THD+N, efficiency, thermal behavior, and EMI compliance without custom PCB development.

Does the PAM8965-EVM support Kelvin speaker connection?

Yes. The PAM8965-EVM routes the LFBP, LFBN, RFBP, and RFBN pins to dedicated test points and solder pads, allowing direct Kelvin connection to speaker terminals. This eliminates PCB trace resistance and inductance from the feedback loop, preserving audio fidelity and enabling precise compensation networks for tonal shaping-critical for premium portable speaker designs where passive filtering replaces DSP-based EQ.

How does the PAM8965-EVM handle thermal management?

The board implements the thermal design guidelines specified in the PAM8965 datasheet: the IC's exposed thermal pad is soldered to a large copper pour connected to multiple thermal vias, and the layout ensures low-impedance PGND and GND planes. Thermal foldback behavior (triggering at +125°C junction temperature) and fault flag (FLT) output are observable via onboard LED and test point, allowing real-time validation of thermal protection under sustained 12W/channel load conditions.

Can the PAM8965-EVM operate from a single-cell lithium battery?

Yes. The PAM8965-EVM supports 1SxP operation (VBAT = 3.7V nominal), delivering 2 × 8W into 6Ω loads at 10% THD+N. Its integrated boost converter regulates PVDD to ~9.2V, ensuring consistent Class-D output swing regardless of battery discharge. Input decoupling capacitors and layout follow Diodes' recommendations for stable 1S operation, including low-ESR bulk capacitance at VBAT1/VBAT2 and proper PVDD local bypassing per channel.