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UC3854N

Average current mode PFC controller, CCM boost, 200kHz, 7.5V ref, 16-PDIP

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Manufacturer Part：

UC3854N

Package：

16-PDIP (19.3 x 6.35 x 4.57mm)

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Description

Product Overview

The UC3854N from Texas Instruments is a power factor correction (PFC) controller implementing average current mode control for continuous conduction mode boost converters. It provides near-unity power factor for off-line power supplies with 16-pin DIP through-hole package.

Key Specifications

Manufacturer Texas Instruments
Type Power Factor Correction Controller
Control Mode Average Current Mode
Topology Boost (CCM)
Supply Voltage 10.5V to 20V
Switching Frequency Up to 200kHz (programmable)
Reference Voltage 7.5V +-2%
Multiplier Output Current mode multiplier
OVP Comparator Yes
UVLO Threshold 10.5V on / 9.5V off
Package 16-PDIP (19.3 x 6.35mm)
Operating Temperature 0C to +70C

Features

  • Average current mode control for CCM boost PFC
  • Near-unity power factor correction
  • Internal 7.5V precision reference
  • Analog multiplier/divider for line voltage feedforward
  • Overshoot and overvoltage protection
  • Undervoltage lockout (UVLO)
  • Programmable switching frequency up to 200kHz
  • Soft-start capability
  • Current error amplifier with wide bandwidth

Applications

  • Off-line switch-mode power supply PFC pre-regulators
  • Industrial power supplies requiring PFC
  • Lighting ballast power factor correction
  • Server and telecom power supplies

The Texas Instruments UC3854N is a power factor correction controller that provides active power factor correction for off-line power supplies by shaping the input line current to match the input line voltage waveform. Using average current mode control with continuous conduction mode boost topology, the device achieves near-unity power factor. The UC3854 integrates a voltage error amplifier, current error amplifier, analog multiplier/divider with line voltage feedforward, PWM comparator, and oscillator. The internal 7.5V precision reference provides stable voltage regulation. Overvoltage protection, undervoltage lockout, and soft-start features ensure safe and reliable operation. The device is the industry-standard PFC controller widely used in medium to high power applications.

The UC3854N operates through three nested control loops: 1) Voltage Loop: The voltage error amplifier compares a fraction of the boost output voltage with the 7.5V internal reference, producing an error signal VEAO that represents the required power level. 2) Multiplier: The analog multiplier divides VEAO by the square of the average input voltage (feedforward), then multiplies by the instantaneous rectified line voltage. This produces a current reference signal with the correct sinusoidal shape and amplitude for near-unity power factor. 3) Current Loop: The current error amplifier compares the multiplier output with the actual inductor current sensed through a current shunt. The average current mode control ensures the inductor current accurately tracks the sinusoidal reference regardless of inductor ripple. The PWM comparator generates gate drive pulses to the external boost MOSFET.

Pin Name Type Function
1 GND Ground Ground
2 PKLMT Input Peak current limit comparator input
3 CA OUT Output Current amplifier output
4 ISENSE Input Current sense inverting input
5 MULT OUT Output Multiplier output (current reference)
6 IAC Input AC current input (rectified line)
7 VA OUT Output Voltage amplifier output
8 VREF Output 7.5V reference output
9 VCC Power Supply voltage
10 GTDRV Output Gate drive output
11 VSENSE Input Voltage amplifier inverting input
12 RSET Input Oscillator charge current set resistor
13 SS I/O Soft-start capacitor
14 CT I/O Oscillator timing capacitor
15 VFF Input Feedforward voltage input
16 VRMS Input RMS line voltage input (feedforward)
  • Off-line 300W-2000W SMPS PFC pre-regulator stage
  • Server and telecom power supply with active PFC
  • Industrial equipment meeting IEC 61000-3-2 harmonic limits
Manufacturer Part Number Package Notes
TI UCC3817N 16-PDIP Lower power PFC controller
TI UC3854BN 16-PDIP Enhanced version with improved performance
Infineon ICE1PCS01GXKLA1 8-DIP Simplified PFC controller
ST L6562AT DIP-8 Transition-mode PFC controller
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Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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