LT8705AEFE

Series:	*
Part Status:	Obsolete

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LT8705AEFE Application Field and Working Principle

The LT8705AEFE is a DC-DC switching controller integrated with a high voltage power MOSFET and a low power MOSFET. It can be used for various high-voltage isolated, isolated AC-DC, DC-DC and other converters, such as batteries with UPS, high voltage DC/DC converters and low power offline DC/DC converters.LT8705AEFE integrates advanced analog control circuits and digital logic circuit and flash memory. The Part has analog error amplifier, 1A peak current source, PWM voltage-mode climbing OVP circuit and advanced digital logic circuit, OVP delay delay, zero voltage crossing function and shutdown function. With these special features, it can be widely used in various applications.

Application Fields

LT8705AEFE is a PG-DQFN28-14Y package, which is especially suitable for automotive, medical and industrial control applications. It can sense input voltage and output voltage. It also has digital logic unit and analog control circuits, which can realize low standby power, high precision, small size and low price advantages.

Working Principle

LT8705AEFE works following the voltage mode control principle. When the regulator senses the input voltage and output voltage, its analog control circuits will compare these two signals and adjust the output voltage by controlling the shared power MOSFET.The output current is controlled by the pulsewidth-modulated (PWM) output of the controller, and the output voltage is indirectly regulated by the PWM output. When the output voltage is lower than the desired value, the controller increases the conduction time of the power MOSFET, thus increasing the output voltage. On the contrary, when the output voltage is higher than the demand, the controller will reduce the conduction time of the power MOSFET, thus the output voltage decreases.In addition, the output voltage will follow the input voltage when the regulator is in the low-power state. And the feedback of the loop can be ensured by integrating a voltage error amplifier and a current amplifier within the controller.

Conclusion

The LT8705AEFE is an integrated power controller integrated with a high voltage control MOSFET and a low power control MOSFET. It can be used for various high-voltage isolated, isolated AC-DC, DC-DC and other converters. With advanced analog control circuits and digital logic circuit and flash memory, LT8705AEFE offers advantages of low standby power, high precision, small size and low cost and is especially suitable for automotive, medical and industrial control applications.

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