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US1855ADW

更新时间: 2024-09-26 20:13:35
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德州仪器 - TI /
页数 文件大小 规格书
9页 429K
描述
US1855ADW

US1855ADW 技术参数

生命周期:Obsolete包装说明:,
Reach Compliance Code:unknown风险等级:5.84
Base Number Matches:1

US1855ADW 数据手册

 浏览型号US1855ADW的Datasheet PDF文件第2页浏览型号US1855ADW的Datasheet PDF文件第3页浏览型号US1855ADW的Datasheet PDF文件第4页浏览型号US1855ADW的Datasheet PDF文件第5页浏览型号US1855ADW的Datasheet PDF文件第6页浏览型号US1855ADW的Datasheet PDF文件第7页 
UC1855A/B  
UC2855A/B  
UC3855A/B  
High Performance Power Factor Preregulator  
FEATURES  
DESCRIPTION  
Controls Boost PWM to Near Unity  
Power Factor  
The UC1855A/B provides all the control features necessary for high  
power, high frequency PFC boost converters. The average current mode  
control method allows for stable, low distortion AC line current program-  
ming without the need for slope compensation. In addition, the UC1855  
utilizes an active snubbing or ZVT (Zero Voltage Transition technique) to  
dramatically reduce diode recovery and MOSFET turn-on losses, result-  
ing in lower EMI emissions and higher efficiency. Boost converter switch-  
ing frequencies up to 500kHz are now realizable, requiring only an  
additional small MOSFET, diode, and inductor to resonantly soft switch  
the boost diode and switch. Average current sensing can be employed us-  
ing a simple resistive shunt or a current sense transformer. Using the cur-  
rent sense transformer method, the internal current synthesizer circuit  
buffers the inductor current during the switch on-time, and reconstructs the  
inductor current during the switch off-time. Improved signal to noise ratio  
and negligible current sensing losses make this an attractive solution for  
higher power applications.  
Fixed Frequency Average Current  
Mode Control Minimizes Line Current  
Distortion  
Built-in Active Snubber (ZVT) allows  
Operation to 500kHz, improved EMI  
and Efficiency  
Inductor Current Synthesizer allows  
Single Current Transformer Current  
Sense for Improved Efficiency and  
Noise Margin  
Accurate Analog Multiplier with Line  
Compensator allows for Universal  
Input Voltage Operation  
The UC1855A/B also features a single quadrant multiplier, squarer, and  
divider circuit which provides the programming signal for the current loop.  
The internal multiplier current limit reduces output power during low line  
conditions. An overvoltage protection circuit disables both controller out-  
puts in the event of a boost output OV condition.  
High Bandwidth (5MHz), Low Offset  
Current Amplifier  
Overvoltage and Overcurrent  
protection  
Two UVLO Threshold Options  
150µA Startup Supply Current Typical  
Precision 1% 7.5V Reference  
Low startup supply current, UVLO with hysteresis, a 1% 7.5V reference,  
voltage amplifier with softstart, input supply voltage clamp, enable com-  
parator, and overcurrent comparator complete the list of features. Avail-  
able packages include: 20 pin N, DW, Q, J, and L.  
BLOCK DIAGRAM  
UDG-94001-2  
License Patent from Pioneer Magnetics. Pin numbers refer to DIL-20 J or N packages.  
6/98  

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