Product category:
Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3873
Edited by the Electronicstalk Editorial
Team on 24 September 2007
Controller cuts down power convertor
designs
Current-mode PWM controller contains all the features necessary to design high-efficiency single-ended isolated and nonisolated flyback convertors rated up to 25W.
The LTC3873 is a current-mode PWM controller from Liner Technology that is designed to reduce the size and complexity of flyback, boost and sepic power supplies This device contains all the features necessary to design high efficiency single-ended isolated and nonisolated flyback convertors rated up to 25W for telecommunications, networking equipment, power-over-Ethernet (PoE), automotive, consumer and general housekeeping power supplies
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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The LTC3873 is ideal for wide input voltage range applications where the input can vary from 9 to 75V during startup, it will sustain operation from 4 to 75V after startup.
This enables users to have one power supply for 48, 24 and 12V nominal input systems.
The LTC3873-5 is a product version with a 3.9V undervoltage lockout, which allows convertors to operate and start from a 5V input source up to 75V.
This makes the part ideal for boost conversion from a 5V input source to 12, 24, 48V and higher output voltages.
A current sense resistor is optional and the current limit threshold is programmable, allowing the use of a wide variety of external MOSFETs for different topologies.
The LTC3873/-5 can regulate output voltages as low as 0.8V and has an integrated soft-start function that limits inrush current, reducing output voltage overshoot.
The operating frequency is fixed at 200kHz and constant frequency operation is maintained down to light loads, resulting in less low frequency noise generation over a wide range of load currents.
With its ultra-low 50uA startup current, the IC allows the use of a high-value input resistor and a low-value capacitor for low power dissipation and quick power supply startup.
With a standby quiescent current of only 300uA, the LTC3873 is an excellent choice for automotive applications.
The LTC3873 is offered in an 8-lead 2 x 3mm DFN and 8-lead TSOT-23 packages and has an operating temperature range from -40 to +85C.
The 1000-piece price starts at US $1.25. Request a free brochure from Linear Technology Corp ...
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