LTC3766HUFD#PBF

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

The LTC3766HUFD#PBF is a current-mode, pulse width modulating (PWM) power supply controller. It combines advanced integrated features with a low external component count to provide cost-effective solutions for a wide range of off-line power supply applications. The LTC3766HUFD#PBF is specifically designed for single-stage, primary-side-controlled power supplies utilizing the traditional avalanche mode of PWM control. It has two voltage feedbacks and three current feedbacks to optimize the control of the power supply. It reduces standby power consumption and increases system reliability significantly.

Features & Benefits

• Excellent line and load regulation
• Protected secondary-side control
• External frequency synchronization
• Soft-start and current-limit circuitry
• Reverse input field-effect transistor (FET) capability
• Integrated 1.25A P-channel FET driver

Applications

• Off-line switch-mode power supplies
• Desktop, notebook, server and adapter power supplies
• Confined space applications
• Power converters with low external component count

Working Principle of LTC3766HUFD#PBF

The LTC3766HUFD#PBF is a current-mode, pulse-width modulating (PWM) power supply controller. It combines advanced integrated features with a low external component count to provide cost-effective solutions for a wide range of off-line power supply applications. The controller works on a clock-cycle basis and controls AC/DC power conversion. Its operation can be simplified into 4 different stages: voltage sensing, current sensing, comparing and driving.

In the first stage of operation, called voltage sensing, the controller senses an ac mains voltage. The second stage of operation is the current sensing stage, where the controller senses how much current is available in the output of the transformer. The third stage of operation is the comparing stage, where the sensed values are compared by the controller. In the final stage of operation, called the driving stage, the controller drives the power switch to create a regulated voltage output.

The PWM control method is a type of power supply control method which is the most commonly used method of controlling power supplies. It is a type of switched-mode power supply (SMPS) control using a power transistor to switch the supply on and off according to the input voltage in response to an electronic signal. The signal contains the information on the amount of power needed to be supplied to the load. The input voltage is compared with a reference signal; if the input voltage is higher than the reference signal, then the power switch is turned off and no power is supplied. On the other hand, if the voltage is lower than the reference signal, then the power switch is turned on and power is supplied.

The LTC3766HUFD#PBF has two voltage feedbacks and three current feedbacks to optimize the control of the power supply. The two voltage feedbacks are used for regulation and the three current feedbacks are used for current limiting, soft start, and averaged current mode control. The two voltage feedbacks can be either inputs from a voltage divider or a voltage feedback from the secondary of the transformer. The three current feedback loops are used to detect the current flowing through the power switch and also through the output. This information is used to maintain the correct output voltage and also to limit current under over-load conditions. This combination of features provides excellent line and load regulation over the full AC line and load range, as well as providing protection against over-current or over-voltage conditions.

In conclusion, the LTC3766HUFD#PBF is a current-mode, pulse-width modulating (PWM) power supply controller. It combines advanced integrated features with a low external component count to provide cost-effective solutions for a wide range of off-line power supply applications. With its two voltage feedbacks and three current feedbacks, it is able to optimize the control of the power supply and provide excellent line and load regulation, thereby increasing system reliability and reducing standby power consumption significantly.

The specific data is subject to PDF, and the above content is for reference