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UC1855BQ PDF预览

UC1855BQ

更新时间： 2024-11-26 21:14:23
品牌 Logo 应用领域
德州仪器 - TI 开关
页数 文件大小 规格书
9页 424K
描述
1.5A POWER FACTOR CONTROLLER, 500kHz SWITCHING FREQ-MAX, PQCC20, PLASTIC, LCC-20

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中文翻译

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UC1855BQ 技术参数

生命周期：Obsolete零件包装代码：QLCC
包装说明：QCCJ,针数：20
Reach Compliance Code：unknownECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.76
模拟集成电路 - 其他类型：POWER FACTOR CONTROLLER控制模式：CURRENT-MODE
控制技术：PULSE WIDTH MODULATION最大输入电压：35 V
最小输入电压：15 V标称输入电压：18 V
JESD-30 代码：S-PQCC-J20长度：8.965 mm
功能数量：1端子数量：20
最高工作温度：125 °C最低工作温度：-55 °C
最大输出电流：1.5 A封装主体材料：PLASTIC/EPOXY
封装代码：QCCJ封装形状：SQUARE
封装形式：CHIP CARRIER认证状态：Not Qualified
座面最大高度：4.57 mm表面贴装：YES
切换器配置：BOOST最大切换频率：500 kHz
温度等级：MILITARY端子形式：J BEND
端子节距：1.27 mm端子位置：QUAD
宽度：8.965 mmBase Number Matches：1

UC1855BQ 数据手册

 浏览型号UC1855BQ的Datasheet PDF文件第2页浏览型号UC1855BQ的Datasheet PDF文件第3页浏览型号UC1855BQ的Datasheet PDF文件第4页浏览型号UC1855BQ的Datasheet PDF文件第5页浏览型号UC1855BQ的Datasheet PDF文件第6页浏览型号UC1855BQ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  
1234567...9

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