TNY287KG-TL Integrated Circuits (ICs)

Duty Cycle:	67%
Mounting Type:	Surface Mount
Supplier Device Package:	12-ESOP
Package / Case:	12-BESOP (0.350", 8.89mm Width), 11 Leads, Exposed Pad
Operating Temperature:	-40°C ~ 150°C (TJ)
Control Features:	EN
Fault Protection:	Current Limiting, Open Loop, Over Temperature, Over Voltage, Short Circuit
Power (Watts):	18W
Frequency - Switching:	124kHz ~ 140kHz
Series:	TinySwitch®-4
Voltage - Supply (Vcc/Vdd):	--
Topology:	Flyback
Voltage - Breakdown:	725V
Internal Switch(s):	Yes
Output Isolation:	Isolated
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

TNY287KG-TL is an efficient, low standby voltage and current drain, offline switcher with adjustable output voltage, available in a standard 8-lead SOIC package. The device is ideal for offline systems where low standby consumption is needed. The device is also suitable for applications such as single cell battery charger, solar power and automotive applications.

Application Field

TNY287KG-TL is mainly used in AC/DC converters. When most of the conversion of AC voltage to DC voltage is done, the TNY287KG-TL work as an offline switcher to output a fixed voltage. Offline switchers provide isolation, instantaneously answer high inrush currents, have a wide operating voltage range, and have reliable switch-on behavior. The TNY287KG-TL can be used in AC/DC converters due to its ability to produce DC output from the given AC input.The TNY287KG-TL is also suitable for single cell battery chagers, solar power systems and automotive applications. Single cell battery chargers typically require low standby current to extend the capacity of the battery over time. Solar systems require very low standby current levels to maximize the lifetime of the solar panel. Automotive applications require robust switch control and the TNY287KG-TL provides this with its built-in frequency jittering for enhanced EMI performance, improved line-load sideswitching.

Working Principle

The TNY287KG-TL is a switch-mode power supply (SMPS) that operates by rapidly switching on and off in order to convert the AC input voltage into a steady DC output voltage.The internal circuitry of the TNY287KG-TL is the same as other switch-mode power supplies and consists of three main components: an input filter, an error amplifier, and a voltage-controlled oscillator. The input filter is used to remove noise, ripples and transients on the input AC voltage. The error amplifier monitors the output voltage of the device and compares it with the desired output voltage. The error amplifier then adjusts the voltage-controlled oscillator according to the errors detected. The voltage-controlled oscillator output signal is then used to control the switch on the SMPS, allowing current to flow through the power transformer.When the switch is open, the current swiftly drops to zero and the energy stored in the inductor is converted to heat by the diode. This process is continuously repeated, allowing the TNY287KG-TL to produce a steady DC output voltage from the given AC input.

Conclusion

TNY287KG-TL provides incredible efficiency and low standby voltage and current for a variety of applications such as AC/DC converters, single cell battery chargers, solar systems, and automotive applications. Its internal circuitry consists of three main components that work together to convert AC input voltage into a steady DC output voltage. With its improved line-load sideswitching and frequency jittering, the TNY287KG-TL provides a robust and reliable means of providing low standby current levels and efficient regulation.

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