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UC3854 High Power Factor Preregulator IC SMD
The UC3854 is a high-performance Power Factor Correction (PFC) controller IC designed by Texas Instruments for boost-type pre-regulator circuits in switch-mode power supplies. It enables systems to achieve near-unity power factor while maintaining tight regulation of the DC output voltage, making it an essential component in modern, energy-efficient power systems.
Housed in a compact SMD package, the UC3854 integrates all the necessary control and protection functions required for high-power AC–DC conversion. It is widely used in industrial power supplies, computer systems, telecommunications equipment, and motor drives where high efficiency, low harmonic distortion, and EMI compliance are critical.
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Features:-
- Control Boost PWM to 0.99 Power Factor
- Limit Line-Current Distortion to < 5%
- World-Wide Operation Without Switches
- Feed forward Line Regulation
- Average Current-Mode Control
- Low Noise Sensitivity
- Low Startup Supply Current
- Fixed-Frequency PWM Drive
- Low-Offset Analog Multiplier and Divider
- 1-A Totem-Pole Gate Driver
- Precision Voltage Reference
Specifications:-
| Parameter | Min | Max | Unit | |
| Supply Voltage | VCC | 35 | V | |
| Input Voltage | VSENSE, VRMS | 11 | ||
| ISENSE, MULTOUT | 11 | |||
| PKLMT | 5 | |||
| Gate driver current Input current | 50% duty cycle | 1.5 | A | |
| Continuous | 0.5 | |||
| Input current | RSET, IAC, PKLMT, ENA | 10 | mA | |
| Power dissipation | 1 | W | ||
| Storage temperature, Tstg | -65 | 150 | °C | |
Applications
- High-power AC–DC power supplies
- Server and telecom SMPS systems
- Industrial automation and motor control
- UPS and inverter front ends
- LED lighting power factor correction circuits
- Battery charging systems
- Medical and instrumentation equipment
*Product image for illustration purposes only, actual product may vary.
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