LNK4004D-TL

Duty Cycle:	--
Mounting Type:	Surface Mount
Supplier Device Package:	8-SO
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Operating Temperature:	-25°C ~ 125°C (TJ)
Control Features:	--
Fault Protection:	Over Temperature, Over Voltage, Short Circuit
Power (Watts):	15W
Frequency - Switching:	65kHz
Series:	LinkSwitch™-4
Voltage - Supply (Vcc/Vdd):	5 V ~ 16.5 V
Topology:	Flyback
Voltage - Breakdown:	--
Internal Switch(s):	No
Output Isolation:	Isolated
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The LNK4004D-TL is an off-line utility class power switch integrated circuit. It is designed to provide complete power control functionality as part of a normally off-line switcher in applications including power supplies and ac/dc converters. It is suitable for applications up to 75 Watts. This article will introduce the application field and working principle of the LNK4004D-TL.

Application Field

The LNK4004D-TL is an ideal choice for applications such as ac/dc adapters, off-line power supplies, and telecom/datacom applications such as routers, switches, and hub. The voltage range of this part is from approximately 90 VAC to 264 VAC and the operating temperature range is from -40°C to 85°C.

Features

The LNK4004D-TL provides complete power control for off-line switch-mode applications. It operates at up to 750V peak-off- line and from 90VAC to 264 VAC line-inputs. The chip includes two voltage regulators, a 750V power MOSFET, and a low voltage sense input. In addition, it includes a peak current limit feature to protect the converter from short circuits, open-loop faults or other over current conditions. It has an under-voltage lockout feature to prevent the converter from operating when an input voltage is too low. Its protection feature also includes over-temperature protection that shuts down the converter when the MOSFET driver junction temperature reaches its thermal limit.

Working Principle

The LNK4004D-TL integrates a power MOSFET, a start-up current source, as well as an optional voltage controller and thermal protection circuit into a single chip. The power MOSFET operates in a high-frequency, fixed-frequency, peak-current-limit mode. The current source uses a one-time start-up to provide the initial conduction current to the power MOSFET when it is switched on. This current source is tripped during the initial start-up or when over-current occurs, allowing the converter to latch off with minimum power dissipation. The voltage regulator provides a low-voltage, low-ripple regulated output at the drain of the FET. The thermal protection circuit monitors the MOSFET driver junction temperature and shuts down the converter if the temperature reaches its limit. In summary, the LNK4004D-TL is an integrated off-line switch mode power control IC specially designed for ac/dc or dc/dc applications. It includes a low-dropout voltage regulator, 750V power MOSFET and peak current limit feature to protect the converter from short circuits, and over-temperature protection to shut down output when the temperature exceeded its limit. With all these features and more, the LNK4004D-TL is an ideal choice for AC/DC adapters and off-line power supplies.

Conclusion

The LNK4004D-TL is a versatile off-line switcher power control IC designed for ac/dc or dc/dc applications. It provides complete power control functionality and protection features to the converter. Its integrated 750V power MOSFET and current source limits the converter peak current. The over-temperature protection feature keeps the converter from being over-heated. With these features, the LNK4004D-TL is an ideal choice for ac/dc and dc/dc applications.

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