UC1854B 增强型高功率因子前置稳压器
The UC3854A/B products are pin compatibleenhanced versions of the UC3854. Like the UC3854, these products provide all of the functions necessary for active power factor corrected preregulators. The controller achieves near unity power factor by shaping the ac input line current waveform to correspond to the ac input line voltage. To do this the UC3854A/B uses average current mode control. Average current mode control maintains stable, low distortion sinusoidal line current without the need for slope compensation, unlike peak current mode control.
A 1%, 7.5-V reference, fixed frequency oscillator, PWM, voltage amplifierwith soft-start, line voltage feedforward (VRMS squarer), input supply voltage clamp, and over current comparator round out the lilst of feataures
|
UC1854B |
| UVLO Thresholds On/Off (V) |
10.5/10 |
| Operating Supply (Max) (V) |
20 |
| Startup Current (mA) |
0.25 |
| Operating Supply Current (mA) |
12 |
| Vref (V) |
7.5 |
| Vref tol (%) |
1.3 |
| Duty Cycle (Max) (%) |
95 |
| Practical Operating Frequency (Max) (MHz) |
0.2 |
| Pin/Package |
16CDIP |
| Rating |
Military |
UC1854B 特性
- Controls Boost PWM to Near-Unity Power Factor
- Limits Line Current Distortion To <3%
- World-Wide Operation Without Switches
- Accurate Power Limiting
- Fixed-Frequency Average Current-Mode Control
- High Bandwidth (5 MHz), Low-Offset Current Amplifier
- Integrated Current- and Voltage-Amplifier Output Clamps
- Multiplier Improvements: Linearity, 500 mV VAC Offset (Eliminates External Resistor), 0 V to 5 V Multout Common-Mode Range
- VREF GOOD Comparator
- Faster and Improved Accuracy ENABLE Comparator
- UVLO Options (16 V/10 V or 10.5 V/10 V)
- 300-µA Start-Up Supply Current
UC1854B 芯片订购指南
| 器件 |
状态 |
温度 (oC) |
价格（美元） |
封装 | 引脚 |
封装数量 | 封装载体 |
丝印标记 |
| 5962-9326102MEA |
ACTIVE |
-55 to 125 |
22.10 | 100u |
CDIP (J) | 16 |
1 | TUBE |
|
| UC1854BJ |
ACTIVE |
-55 to 125 |
17.27 | 100u |
CDIP (J) | 16 |
1 | TUBE |
|
| UC1854BJ883B |
ACTIVE |
-55 to 125 |
22.10 | 100u |
CDIP (J) | 16 |
1 | TUBE |
|
UC1854B 质量与无铅数据
| 器件 |
环保计划* |
铅/焊球涂层 |
MSL 等级/回流焊峰 |
环保信息与无铅 (Pb-free) |
DPPM / MTBF / FIT 率 |
| 5962-9326102MEA |
TBD |
Call TI |
Call TI |
5962-9326102MEA |
5962-9326102MEA |
| UC1854BJ |
TBD |
A42 |
N/A for Pkg Type |
UC1854BJ |
UC1854BJ |
| UC1854BJ883B |
TBD |
A42 |
N/A for Pkg Type |
UC1854BJ883B |
UC1854BJ883B |
UC1854B 工具与软件
UC1854B 应用技术支持与电子电路设计开发资源下载
- UC1854B数据资料 dataSheet 下载.PDF
- TI 德州仪器电源管理选型与价格参考 . xls
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