Diodes Incorporated AP33771-EVB

Overview

AP33771-EVB from Diodes Incorporated is a USB Type-C® PD3.0/PPS evaluation board for the AP33771 sink controller IC. It enables rapid validation of DC power negotiation, voltage selection (5V–20V), power capability (12W–100W), and fault indication via GPIO4-driven LED in battery-powered or DC-input TCDs. The board supports fixed PDO and PPS APDO sourcing with hardware-configurable VSEL0–VSEL2 and PSEL resistor networks.

For engineers reviewing the AP33771-EVB datasheet, AP33771-EVB pinout, AP33771-EVB application, or AP33771-EVB equivalent, this board delivers hands-on verification of USB PD3.0 sink behavior-including CC1/CC2 BMC transceiver operation, OVP hard reset response, NMOS VBUS switch control timing, and dead-battery mode startup-without firmware development.

Technical Context

The AP33771-EVB implements the full AP33771 sink controller functionality in a testable layout: it routes all 24 pins of the W-QFN4040-24 (Type A1) IC to accessible test points and configurable jumpers, including dedicated VSEL0/VSEL1/VSEL2 voltage select headers, PSEL resistor pads (6.8kΩ–91kΩ), and CC1/CC2 termination networks compliant with USB Type-C specification. The board integrates a 10mΩ current-sense shunt at ISENP and discrete 5V/3.3V LDOs for V5V/V3VD rails.

It replicates the reference design from DS43500 Rev. 7–3 Figure 2: includes NMOS VBUS switch (Q1/Q2), FAULT LED driver (R13/R14/R15), 1μF/10μF/100nF decoupling per power domain, and ESD protection on CC lines. All critical timing parameters-VSEL scan interval (250ms), OVP debounce (90ms), and PWR_EN turn-off delay (50ms)-are preserved per datasheet specifications.

Key Specifications

Availability

AP33771-EVB is available at Aetrix Electronics and suitable for USB PD3.0 compliance testing, PPS-enabled power adaptor validation, and USB-C-to-barrel connector cable development requiring stable component supply and traceable engineering samples.

Supply support for AP33771-EVB 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 integrated circuits, specializing in high-performance analog, logic, and power management solutions for industrial, consumer, and communications markets.

The AP33771-EVB belongs to Diodes' USB Power Delivery Evaluation Platform product line, designed specifically to accelerate adoption of USB PD3.0 sink functionality in battery-powered devices and DC-input peripherals without custom firmware development.

FAQ

Does AP33771-EVB support PPS (Programmable Power Supply) negotiation?

Yes. The AP33771-EVB fully supports PPS APDO negotiation per USB PD Rev. 3.0 v1.2, using the embedded BMC transceiver and OTP firmware of the AP33771 IC. It validates dynamic voltage adjustment within ±20mV resolution and 10mV step size as specified in the PPS profile, confirmed by CC1/CC2 eye diagram testing per DS43500.

What is the role of the PSEL resistor on AP33771-EVB?

The PSEL resistor sets requested power capacity from 12W to 100W in ten discrete steps. The AP33771-EVB provides solder pads for precision resistors (±1% tolerance), enabling direct measurement of the PSEL pin voltage (0–3.7V range) and correlation to negotiated power level per Table 2 in DS43500 Rev. 7–3.

Can AP33771-EVB operate in dead-battery mode?

Yes. The board demonstrates dead-battery startup per AP33771 specification: when VCC drops below 2.7V, the IC enters deep-sleep mode (ICC_DEEP ≤ 900μA) and wakes upon CC line activity. This allows initial power-up from a discharged battery via 5V VBUS before system regulation engages.

Is AP33771-EVB compatible with USB-IF certification test equipment?

Yes. The AP33771-EVB implements the exact pin mapping, CC termination, BMC transceiver biasing, and timing margins required for USB-IF compliance testing. Its TID 5000 certification applies to the AP33771 IC, and the EVB's layout adheres to USB Type-C specification v2.1 mechanical and electrical requirements for sink device validation.