Infineon Technologies XDPS21071XUMA1

Overview

XDPS21071 from Infineon Technologies is a digital AC/DC current-mode PWM controller for high-density DCM flyback adapters, featuring integrated 600 V HV startup cell, forced frequency resonant (FFR) mode with ZVS gate drive, adaptive current limitation, and one-pin UART configuration via GPIO. It operates across 85–264 VAC input and delivers low no-load power for regulatory compliance in compact chargers.

For engineers reviewing the XDPS21071 datasheet, XDPS21071 pinout, XDPS21071 application, or XDPS21071 equivalent, key selection criteria include FFR mode timing control, ZCD-based reflected voltage sensing, dual gate drivers (GD0/GD1), brown-in/brown-out detection via HV pins, and OTP-configurable multi-mode operation for high-power-density adapter designs.

Technical Context

The XDPS21071 implements a digitally controlled current-mode architecture with an embedded ASSP engine executing real-time FFR, burst mode (BM), and DCM algorithms. Its HV startup cell directly senses rectified bulk voltage (pins 5–8) and enables brown-in (9.1 V) and brown-out (20.5 V) detection without auxiliary winding.

It supports two-phase gate drive: GD0 drives the main MOSFET with cycle-by-cycle peak current control (OCP1), while GD1 delivers a dedicated ZVS-initiating pulse for resonant transition. The ZCD pin measures auxiliary winding zero-crossing and reflected output voltage, enabling primary-side regulation without optocoupler dependency in some configurations.

Key Specifications

Pinout & Package

XDPS21071 is housed in a PG-DSO-12-20 package - a 12-lead, thermally enhanced SOIC variant with exposed thermal pad, optimized for high-power-density flyback SMPS layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital flyback controller applications.

Compared with UCC28780 and ICE5QSBG, XDPS21071 uniquely integrates HV startup, FFR+ZVS timing, and OTP configuration in a single DSO-12 package-enabling higher power density, lower no-load power, and reduced external component count without sacrificing protection robustness.

Availability

XDPS21071 is available at Aetrix Electronics and suitable for high-density USB PD fast charging adapters, GaN-based laptop chargers, universal-input industrial power supplies, and multi-port USB-C wall adapters requiring stable component supply and long-term lifecycle support.

Supply support for XDPS21071 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

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive, and industrial control ICs, with leadership in silicon carbide and digital power solutions.

The XDPS21071 belongs to Infineon's XDPS digital flyback controller product line, designed specifically for high-efficiency, high-power-density AC/DC adapters targeting USB PD, fast charging, and compact industrial power supplies.

FAQ

What is the function of the GD1 pin, and how does it differ from GD0?

GD1 is a dedicated gate driver output that generates a precisely timed pulse to initiate zero-voltage switching (ZVS) in forced frequency resonant (FFR) mode. Unlike GD0-which drives the main power MOSFET with standard PWM timing and cycle-by-cycle current limiting-GD1 operates independently to control resonant tank timing, enabling loss reduction without altering GD0's primary switching behavior.

Can the XDPS21071 operate without an optocoupler?

Yes, the XDPS21071 supports primary-side regulation using the ZCD pin to sense reflected output voltage, eliminating the need for an optocoupler in many constant-voltage applications. However, MFIO remains available for secondary-side feedback if tighter regulation, CV/CC control, or multi-output tracking is required.

How is configuration performed, and what parameters can be programmed?

Configuration is performed via one-pin UART on the GPIO pin during startup (before brown-in completes), using Infineon's .dp Vision software. Programmable parameters include FFR frequency law, burst mode entry/exit thresholds, OCP1/OCP2 levels, soft-start time, and brown-in/out hysteresis-all stored in on-chip OTP memory for production repeatability.

What thermal and safety protections are integrated?

The XDPS21071 integrates internal over-temperature protection (130 °C trip), VCC under-voltage lockout (7.2 V/9.6 V), brown-in (9.1 V) and brown-out (20.5 V) detection via the HV pins, primary-side output over-voltage protection (2.75 V on ZCD), and dual-level over-current protection (OCP1 and OCP2) with configurable blanking times-ensuring full-cycle safety without external supervision ICs.