TOP254MN

Duty Cycle:	78%
Mounting Type:	Through Hole
Supplier Device Package:	SDIP-10C
Package / Case:	10-SDIP (0.300", 7.62mm), 9 Leads
Operating Temperature:	-40°C ~ 150°C (TJ)
Control Features:	--
Fault Protection:	Current Limiting, Over Temperature, Over Voltage
Power (Watts):	28W
Frequency - Switching:	66kHz
Series:	TOPSwitch®-HX
Voltage - Supply (Vcc/Vdd):	--
Topology:	Flyback
Voltage - Breakdown:	700V
Internal Switch(s):	Yes
Output Isolation:	Isolated
Part Status:	Active
Packaging:	Tube

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Introduction:

TOP254MN is a monolithic switching power supply integrated circuit developed by Power Integrations, Inc. It combines a flyback controller, MOSFET, offset compensationation, current sensing, and a wide operating range in a single package. TOP254MN is a cost effective solution for high efficiency, stand-alone DC/DC converters and offline switchers. Typical applications include power adapters, industrial control, monolithic battery chargers, and telecom systems.

Application Field:

TOP254MN offers a wide range of applications. It can be used in external AC to DC power supplies, DC to DC converters, AC/DC battery chargers, and offline switchers. In external AC to DC power supplies, TOP254MN offers a cost effective solution with a high efficiency, low power consumption, excellent output ripple and voltage regulation, and protection against brown out and surge. In DC to DC converters, TOP254MN is capable of handling wide input voltage ranges, wide load ranges, and supports programmable soft-start. It provides excellent thermal protection and current limiting, as well as under-voltage lock-out (UVLO) and over-voltage protection (OVP). In AC/DC battery chargers, TOP254MN provides fast and accurate charging control with over-voltage protection (OVP), thermal protection, and temperature compensation charging. Finally, in offline switchers, TOP254MN offers protection against load transients, over-load and thermal protection, current limiting, and soft start.

Working Principle:

TOP254MN is an offline switcher regulated power supply IC. It operates in a synchronous rectification flyback topology, which is an efficiency optimized topology that provides a constant output voltage with little or no waste of power. The IC\'s MOSFET switch is used to convert the rectified AC input voltage into a regulated DC output. The IC integrates a range of protection features such as over-voltage protection (OVP), over-current protection (OCP), over-load protection (OLP), and under-voltage lock-out (UVLO). It also features a programmable soft-start for smooth startup and a hysteretic start-up for faster power up. In addition, the IC has an adjustable leading edge blanking circuit to reduce EMI interference and synchronous rectification for improved efficiency. TOP254MN also provides an over temperature protection feature that limits operating frequency when the internal die temperature rises above a certain threshold. It also features current limiting and thermal fold back protection which automatically cuts off the load current when the load current exceeds a set threshold.

Conclusion:

TOP254MN is a cost effective and highly efficient monolithic switching power supply IC that is well suited for offline switchers and AC/DC battery chargers. It can handle wide input voltage and load ranges and supports programmable soft-start, over-voltage protection, over-load protection, and under-voltage lock-out. It also provides excellent thermal protection, current limiting, and synchronous rectification, allowing it to achieve high levels of efficiency.

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