Infineon Technologies TDA16822XK

Overview

TDA16822XK from Infineon Technologies is an integrated off-line current-mode PWM controller with a monolithically embedded 650 V CoolMOS™ power transistor in a single P-DIP-8-6 package. It delivers up to 20 W in flyback topologies, features adjustable peak current limiting via external resistor, ±5% current limit tolerance, and latched thermal shutdown at 140 °C.

For engineers reviewing the TDA16822XK datasheet, TDA16822XK pinout, TDA16822XK application, or TDA16822XK equivalent, this device is selected for compact AC/DC adapters, auxiliary power supplies, and low-power offline SMPS where integration of control + high-voltage switch reduces BOM count and layout complexity.

Technical Context

The TDA16822XK implements current-mode control by comparing sensed drain current (via Isense pin) against a feedback-derived reference, directly determining MOSFET on-time. Its oscillator operates at 100 kHz (±7 kHz) with temperature-compensated frequency stability (−1000 ppm/°C).

Protection functions are tightly coupled: overload/open-loop detection triggers hiccup mode via FB and SoftS pin interaction; overvoltage protection activates when VCC exceeds 16 V; thermal shutdown is latched at junction temperature ≥140 °C. The integrated CoolMOS™ provides 650 V V_(BR)DSS, R_DS(on) ≤ 3.8 Ω at 120 °C, and 2.5 A repetitive avalanche current capability.

Key Specifications

Pinout & Package

P-DIP-8-6 package: 8-pin dual in-line plastic, 0.3 inch width, 6.35 mm lead pitch, 90 K/W junction-to-ambient thermal resistance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar off-line current-mode controller with integrated HV MOSFET applications.

Compared with ICE2QS03G and LD7575P, the TDA16822XK uniquely combines integrated soft-start, 650 V avalanche ruggedness, and latched thermal shutdown - making it the only option qualified for universal-input, thermally constrained, and safety-aware 20 W flyback designs.

Availability

TDA16822XK is available at Aetrix Electronics and suitable for AC/DC adapters, industrial auxiliary supplies, and smart meter power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing from original manufacturer stock.

Supply support for TDA16822XK 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 AG is a German semiconductor manufacturer specializing in power management, automotive, and industrial control ICs, with global R&D and manufacturing infrastructure.

The CoolSET™ product line integrates PWM controllers with CoolMOS™ transistors specifically for compact, high-efficiency offline SMPS up to 30 W - targeting space-constrained, cost-sensitive, and thermally demanding AC/DC conversion.

FAQ

What is the maximum continuous output power achievable with TDA16822XK in a flyback design?

The TDA16822XK supports up to 20 W continuous output power in standard DIP-8-based flyback converters with adequate heatsinking and proper transformer design. This rating assumes 85–270 VAC input, 100 kHz switching, and ambient temperature ≤60 °C. Exceeding 20 W risks exceeding the 1.5 A continuous drain current limit and thermal shutdown threshold under sustained load.

Can TDA16822XK operate without an external current sense resistor?

No. An external sense resistor between the Isense pin and CoolMOS™ source is mandatory for cycle-by-cycle current limiting and peak power regulation. Omitting it disables overcurrent protection and causes uncontrolled duty cycle growth, leading to immediate device failure under load. Typical values range from 1.5 Ω to 3.3 Ω depending on target current limit.

How does the hiccup-mode protection respond to a sustained short-circuit on the secondary side?

During sustained short-circuit, FB voltage drops below 0.8 V, triggering hiccup mode within 10–20 ms. The IC disables switching, discharges SoftS capacitor, waits ~500 ms, then attempts restart. This cycle repeats until fault clears. Each burst delivers <100 mW average power, keeping junction temperature below 130 °C and preventing thermal damage.

Is the N.C. pin (Pin 6) required to be left floating, or can it be grounded for mechanical stability?

Pin 6 must remain electrically floating and unconnected - grounding or routing it to any net may cause unpredictable behavior or latch-up due to internal floating node coupling. Mechanical anchoring is permitted only if no solder or conductive material bridges the pin to adjacent pads or traces; conformal coating or physical isolation is recommended in high-vibration environments.