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TNY289PG TinySwitch-4 Off-Line AC-DC Controller IC

Specification	Details
Drain Voltage Rating	725 V
Oscillator Frequency	124 kHz to 140 kHz
Package Type	DIP-8C (Through-Hole)
Output Power (230VAC)	Up to 25 W (Open Frame)
Output Power (85-265VAC)	Up to 15 W (Open Frame)
Control Type	ON/OFF Control (No loop compensation)
Operating Temp Range	-40°C to +150°C

Price

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₹ 80.51

(Tax included)

Barcode: 643929

Product Description

The TNY289PG AC-DC Controller is designed to simplify the complexities of flyback power supply design. It features a 725V rated MOSFET that provides an increased safety margin for universal input designs (85VAC to 265VAC), protecting against line surges and spikes. The IC utilizes an On/Off control scheme which provides high efficiency even at light loads, making it fully compliant with global energy efficiency standards. With its built-in auto-restart, line under-voltage detection, and frequency jittering to reduce EMI, the TNY289PG is a "system-on-a-chip" for reliable, low-power SMPS applications.

Key Features

Simplified Design: Integrated start-up and self-biasing circuitry eliminates the need for a transformer bias winding.
Tight Tolerances: Accurate ON/OFF control threshold and frequency jittering significantly lower the cost of EMI filtering.
Comprehensive Protection: Built-in output overvoltage, line undervoltage, and thermal shutdown (with hysteresis).
High Efficiency: Excellent light-load efficiency and ultra-low no-load consumption (<30 mW at 230 VAC).
Enhanced Safety: The 725V MOSFET rating ensures high reliability in regions with unstable grid voltages.

Technical Details

Pin Configuration: Pin 1 (BP/M), Pin 2 (S), Pin 3 (S), Pin 4 (S), Pin 5 (D), Pin 7 (EN/UV), Pin 8 (S).
Auto-Restart: Limits power delivery to <3% during fault conditions (short circuit or open loop).
EcoSmart™ Technology: Optimized for energy-saving requirements worldwide.

Prototyping and Engineering Tips from Robogears

The Bypass Capacitor: The BP/M pin (Bypass/Multi-function) requires a high-quality ceramic capacitor (typically 0.1µF to 10µF) connected to the Source. The value of this capacitor selects the current limit of the internal MOSFET—refer to the datasheet to match this value to your transformer's primary inductance.
PCB Heat Sinking: In DIP-8 packages, heat is primarily dissipated through the Source pins (Pins 2, 3, 4, and 8). When designing your PCB, connect these pins to a large copper area (pour) on the board to act as a natural heatsink. Avoid placing heat-sensitive components like electrolytic capacitors directly adjacent to these pins.
Line UV Detection: If you want the power supply to shut down during "brownout" conditions, connect a 2MΩ resistor from the high-voltage DC bus to the EN/UV pin. This prevents the IC from attempting to switch at dangerously low input voltages which could saturate the transformer.

Package Includes

1 x TNY289PG TinySwitch-4 AC-DC Controller IC (DIP-8C)

Disclaimer

This IC operates at lethal AC and DC voltages (up to 725V). It is intended for use by experienced electronic engineers. Always use an isolation transformer and high-voltage probes when debugging live flyback circuits. Robogears is not responsible for injury or damage resulting from improper handling of high-voltage components.