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UC3854A
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所属类别：ACDC-和-DCDC-电源
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产品名称：增强型高功率因数前置稳压器
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厂商：TI
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生产批号：10+
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封装：16PDIP, 16SOIC
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库存状态：有库存
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库存量：9000
- 最低订购量：1
- 详细资料：
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This UC3854A/B product is a compatible enhanced version of pin UC3854. Like the UC3854, these products provide all the features needed for an active power factor correction preconditioner. The controller achieves a voltage close to the unit power factor corresponding to the AC input line voltage by shaping the AC input current waveform. To do this UC3854A / B adopts average current mode control. The average current mode control remains stable, and the low-distortion sine line is not like the peak current mode control without the need for slope compensation current.
A 1%, 7.5 V reference, fixed frequency oscillator, pulse width modulation, voltage amplifierwith soft start, line voltage feedforward (V RMS squared), input supply voltage clamp, over lilst feataures are currently relatively round.
characteristic
- ThePWM controls the boost to near power factor
- 限制线电流失真
- Global action, no switch
- Precise power limits
- Fixed frequency average current mode control
- High bandwidth (5 MHz), low bias current amplifier
- Integrated current and voltage amplifier output wire clamps
- Multiplier improvements: linear, 500 mV AC offset (no external resistor required), 0 V to 5 V Multout common mode range
- A good comparison of V REF
- Faster, improved accuracy allows comparison
- UVLO options (V/10, 16, V/10 V or 10.5 V).
- 300μA start-up supply current
parameter
| |
|
UC3854A |
| On/off of undervoltage lockout threshold (5) |
|
16/10 |
| Working power supply (max) (five) |
|
20 |
| Starting Current (mA) |
|
0.25 |
| Operating Supply Current (mA) |
|
12 |
| Vref (V) |
|
7.5 |
| Vref's Thor (%) |
|
1.3 |
| Duty Cycle (Max) (%) |
|
95 |
| Actual operating frequency (max) (MHz) |
|
0.2 |
| Pin/Pack |
|
16PDIP，16SOIC |
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