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參數(shù)資料
| 型號(hào)： | UC1855 |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | High Performance Power Factor Preregulator |
| 中文描述： | 高性能功率因數(shù)前置穩(wěn)壓器 |
| 文件頁數(shù)： | 1/9頁 |
| 文件大?。?/td> | 430K |
| 代理商： | UC1855 |
UC1855A/B
UC2855A/B
UC3855A/B
DESCRIPTION
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.
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.
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
High Performance Power Factor Preregulator
FEATURES
Controls Boost PWM to Near Unity
Power Factor
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
High Bandwidth (5MHz), Low Offset
Current Amplifier
Overvoltage and Overcurrent
protection
Two UVLO Threshold Options
150
μ
A Startup Supply Current Typical
Precision 1% 7.5V Reference
6/98
License Patent from Pioneer Magnetics. Pin numbers refer to DIL-20 J or N packages.
UDG-94001-2
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PDF描述 |
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| UC186x | Resonant-Mode Power Supply Controllers |
| UC3866 | Resonant-Mode Power Supply Controllers |
| UC1862 | Resonant-Mode Power Supply Controllers |
| UC1868 | Resonant-Mode Power Supply Controllers |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UC1855A | 制造商:TI 制造商全稱:Texas Instruments 功能描述:High Performance Power Factor Preregulator |
| UC1855AL | 制造商:Texas Instruments 功能描述:PWR FCTR CORRECTION PREREGUL 0.15MA 230KHZ 20PIN LCC - Rail/Tube |
| UC1855B | 制造商:TI 制造商全稱:Texas Instruments 功能描述:High Performance Power Factor Preregulator |
| UC1855BJ | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| UC1855BL | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Power Factor Controller |
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