LNK6764K-TL

Duty Cycle:	64%
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:	--
Fault Protection:	Current Limiting, Over Load, Over Temperature, Over Voltage, Short Circuit
Power (Watts):	39W
Frequency - Switching:	120kHz ~ 136kHz
Series:	LinkSwitch™-HP
Voltage - Supply (Vcc/Vdd):	--
Topology:	Flyback
Voltage - Breakdown:	650V
Internal Switch(s):	Yes
Output Isolation:	Isolated
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Overview

The LNK6764K-TL is a highly integrated power management integrated circuit (PMIC) designed for offline switch applications. It is able to provide single-stage primary regulation for AC-DC and DC-DC converter designs. The device integrates a high voltage power MOSFET, protection driver, high voltage current sense circuitry and primary side control, allowing it to meet a variety of design requirements in different applications.

Application Field

LNK6764K-TL is suitable for applications including SMPS, external power adaptors, laptop adapters, desktop PC SMPS, smart phones and other home appliances. It is also ideal for battery powered applications including high power LED lighting and LED TVs. The device is able to provide up to 1.2A/750mA of continuous output current in both AC/DC and DC/DC configurations. In addition, it can support an input voltage range between 8V and 30V. With built-in high voltage protection and over-current protection, the device is able to provide a highly reliable solution.

Working Principle

The working principle of LNK6764K-TL is based on the standard secondary side control topology. The device is designed using an open loop control system, which allows for flexibility in terms of output power. The device monitors the primary side of the application and controls the on-time of the switch according to the output power settings. The on-time of the switch is determined by measuring the current in the primary side winding and a sense resistor. When the current reaches the set limit, the device turns off the switch and the cycle repeats again. The device also includes protection circuitry which will shut down the switch if the primary side current or voltage exceeds the pre-set limits. This helps to protect the device and application from damage. In order to accurately set the output power, the LNK6764K-TL has an internal trim circuit. By setting the correct trim resistors, the output power can be adjusted to the desired level. The device also includes two low side MOSFETs to provide additional flexibility. These MOSFETs can be used to control additional circuits or devices in the system.

Conclusion

The LNK6764K-TL is an advanced PMIC designed for offline switch applications. It is ideal for applications such as SMPS, external power adaptors, laptop adapters, desktop PC SMPS and other home appliances. With its highly integrated design, the device can provide single-stage primary regulation while meeting a wide input voltage range. In addition, the device includes protection circuitry and an adjustable trim circuit to adjust the output power. Overall, the LNK6764K-TL is an excellent choice for power management applications.

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