Off Line Switcher, TO220-6, 246

The TOP246YN is a TOPSwitch-GX EcoSmart integrated off line switcher, housed in a 6-pin TO-220 package. This component integrates a high voltage power MOSFET, PWM control, fault protection and other control circuitry onto a single CMOS chip, using the proven TOPSwitch topology. The integration of many new functions reduces system cost, improves design flexibility, and enhances performance and energy efficiency.

Key features include soft start, frequency jittering for lower EMI, a wider DCMAX, hysteretic thermal shutdown, and larger creepage packages. All critical parameters (current limit, frequency, PWM gain) have tighter temperature and absolute tolerances, simplifying design and optimising system cost.

Output Power & Efficiency

• Output power of 125W at 230VAC and 90W at 85VAC to 265VAC in open frame design.
• Output power of 60W at 230VAC and 40W at 85VAC to 265VAC in non-ventilated enclosed adapter.
• Extended power range for higher power applications.
• Wider duty cycle for more power and smaller input capacitor.
• Regulates to zero load without dummy loading.
• 132kHz frequency reduces transformer/power supply size.

Protection & Reliability

• Hysteretic thermal shutdown for automatic fault recovery.
• Large thermal hysteresis prevents PC board overheating.
• Switching frequency of 132kHz (frequency pin connected to source) and 66kHz (connected to control).
• Operating junction temperature range from -40°C to 150°C.

The TOP246YN is ideal for applications in consumer electronics, portable devices, and power management, offering a compact and efficient solution for isolated flyback power supplies.