Switching power supplies are increasingly used due to their small size, light weight and high efficiency. The power control chip is also moving toward small size, high power, and high efficiency. LINEAR's four-switch, current mode, Buck-Boost synchronous controller LTC3780 is a small-volume, high-power, high-efficiency power control. chip. The LTC3780 allows input voltages greater than, less than, or equal to the output voltage. It has fewer external components and greater than 95% efficiency. It is ideal for automation, communications, and battery-powered devices.
1, the characteristics of LTC3780The main features of the LTC3780 controller are as follows:
·Input voltage (Vin): 4V ~ 36V;
·Output voltage (Vout): 4V ~ 30V;
· Operating frequency i200kHz ~ 400kHz;
Built-in low dropout regulator (LDO) for powering the internal circuitry of the chip;
· Control whether an output voltage is generated;
· Can set the soft start time;
· Built-in overvoltage, overcurrent and short circuit protection;
· The highest efficiency can reach 98% in synchronous rectification.
2, the main function of LTC3780
The LTC3780 controller can operate the LTC3780 in different operating modes by different voltage configurations on the FCB pin: in Boost mode, it can be configured as burst mode, discontinuous conduction mode, forced continuous conduction mode. The LTC3780 controller can be configured in pulse skip mode, discontinuous conduction mode, and forced continuous conduction mode in the Buck mode. Burst mode improves power conversion efficiency and extends system continuous operation time in battery-powered mobile applications. When emphasis is placed on noise control, forcing a continuous conduction mode may be the preferred solution, which is a constant frequency switching operation that achieves predictable and easy filtering at the expense of efficiency. The pulse skip mode provides a good compromise between light load efficiency and output voltage ripple.
The LTC3780 controller operates from 200kHz to 400kHz. The operating frequency can be either input by an external oscillator or by an internal oscillator circuit. When generated by the internal oscillating circuit, it is only necessary to connect 0V ~ 2.4V DC voltage between the PLLFLTR and PLLIN pins, so that the internal oscillating circuit can generate a switching frequency of 200 kHz to 400 kHz. When the switching frequency is externally input, only The PLLIN pin is connected to a clock source (where the PLLFLTR is grounded through an O.1μF ceramic capacitor). The internal phase-locked loop circuit of the LTC3780 synchronizes the switching frequency with the input clock source.
Vosense is a voltage feedback pin. The output voltage is compared with the internal reference voltage (0.8V) through an internal error amplifier through an external feedback divider resistor to adjust the MOSFET's on-time to stabilize the output voltage at the set value.
Video Brochure
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used in some occasings, such as graduations, birthday parties, weddings, opening veremonies, company intruction
and other commercial or industrial purposes.
· High resolution LCD screens use thin-film transistor technology for the ultimate display
· Crystal clear audio that is synced with your video
· Custom designed, printed and programmed for UP remium mailable package for Video PrintAd
Specifications:
· LCD SCREENS: 2.4″, 2.8",3.5″, 4.3″,5", 7.0″,10.1"
· MEMORY: 256MB~2G (15 – 60 Minute Video Playback)
· LIFE: 2-3 hours of continuous playback, 6-12 months standby (battery life)
· USB PORT: Usb access for recharging unit and uploading/modifying content
· BATTERIES: Internal Li-ion battery. Rechargable via USB. 15-30mins recharge time.
Options:
· Buttons for Multiple Video Activation
· On/Off Button
· On-Open Activation via a Sensor
· Volume Control
· Specialty Finishing (Spot UV, Embossing, Gold/Silver Foil, Pantones, Metallic Inks, more)
· Cover Materials: Card Stock, Board stock, Leather & Plastic
· AC Power Source Capable
· Continuous Run Cycle
· Motion Activation
· USB Cable
Video Brochure, Video Brochure Card, LCD Video Brochure
AST Industry Co.,LTD , https://www.astsoundchip.com