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UC1849DW PDF预览

UC1849DW

更新时间: 2024-11-22 23:38:51
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其他 - ETC 模拟IC
页数 文件大小 规格书
11页 579K
描述
Analog IC

UC1849DW 数据手册

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UC1849  
UC2849  
UC3849  
Secondary Side Average Current Mode Controller  
FEATURES  
DESCRIPTION  
The UC1849 family of average current mode controllers accurately accom-  
plishes secondary side average current mode control. The secondary side  
output voltage is regulated by sensing the output voltage and differentially  
sensing the AC switching current. The sensed output voltage drives a volt-  
age error amplifier.The AC switching current, monitored by a current sense  
resistor, drives a high bandwidth, low offset current sense amplifier. The  
outputs of the voltage error amplifier and current sense amplifier differential-  
ly drive a high bandwidth, integrating current error amplifier. The sawtooth  
waveform at the current error amplifier output is the amplified and inverted  
inductor current sensed through the resistor. 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.  
Practical Secondary Side Control  
of Isolated Power Supplies  
1MHz Operation  
Differential AC Switching Current  
Sensing  
Accurate Programmable  
Maximum Duty Cycle  
Multiple Chips Can be  
Synchronized to Fastest  
Oscillator  
Wide Gain Bandwidth Product  
(70MHz, Acl>10) Current Error  
and Current Sense Amplifiers  
The UC1849 features load share, oscillator synchronization, undervoltage  
lockout, and programmable output control. Multiple chip operation can be  
achieved by connecting up to ten UC1849 chips in parallel.The SHARE bus  
and CLKSYN bus provide load sharing and synchronization to the fastest  
oscillator respectively. The UC1849 is an ideal controller to achieve high  
power, secondary side average current mode control.  
Up to Ten Devices Can Easily  
Share a Common Load  
BLOCK DIAGRAM  
Pin numbers refer to 24-pin packages.  
UDG-94110  
7/95  
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