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UC2849DW Fiches technique(PDF) 1 Page - Texas Instruments |
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UC2849DW Fiches technique(HTML) 1 Page - Texas Instruments |
1 / 21 page www.ti.com FEATURES DESCRIPTION BLOCK DIAGRAM Pinnumbersreferto24-pinpackages. UC2849 UC3849 SLUS360C – JULY 1995 – REVISED AUGUST 2007 SECONDARY SIDE AVERAGE CURRENT MODE CONTROLLER • Practical Secondary Side Control of Isolated The UC3849 family of average current-mode Power Supplies controllers accurately accomplishes secondary side average current mode control. The secondary-side • 1 MHz Operation output voltage is regulated by sensing the output • Differential AC Switching Current Sensing voltage and differentially sensing the ac switching • Accurate Programmable Maximum Duty Cycle current. The sensed output voltage drives a voltage error amplifier. The ac switching current, monitored • Multiple Chips Can be Synchronized to by a current sense resistor, drives a high bandwidth, Fastest Oscillator low offset current sense amplifier. The outputs of the • Wide Gain Bandwidth Product (70 MHz, Acl voltage error amplifier and current sense amplifier >10) Current Error and Current Sense differentially drive a high bandwidth, integrating Amplifiers current error amplifier. The sawtooth waveform at the • Up to Ten Devices Can Easily Share a current error amplifier output is the amplified and inverted inductor current sensed through the resistor. Common Load This inductor current down-slope compared to the PWM ramp achieves slope compensation, which gives an accurate and inherent fast transient response to changes in load. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Copyright © 1995–2007, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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