UC2854BDWTRG4
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Texas Instruments UC2854BDWTRG4

Manufacturer No:
UC2854BDWTRG4
Manufacturer:
Texas Instruments
Package:
Tape & Reel (TR)
Description:
IC PFC CTR AVERAGE 120KHZ 16SOIC
Delivery:
Payment:
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Product Introduction

Overview

The UC2854BDWTRG4, produced by Texas Instruments, is an advanced high power factor preregulator controller. It is a pin-compatible, enhanced version of the UC2854, designed to provide active power factor correction for power systems. This controller achieves near-unity power factor by shaping the AC input line current waveform to correspond to the AC input line voltage, utilizing average current mode control. This approach maintains stable, low-distortion sinusoidal line current without the need for slope compensation.

Key Specifications

Parameter Typical Value Maximum Value Unit
Supply Voltage (VCC) 18 V 22 V V
VCC Turn-on Threshold 10.5 V - V
VCC UVLO Hysteresis 0.5 V - V
Supply Current (OFF) 400 µA - µA
Supply Current (ON) 12 mA 18 mA mA
Current Amplifier Bandwidth 5 MHz - MHz
Current Amplifier Offset Voltage 0 mV, -4 mV - mV
MULTOUT Voltage (High) 5 V - V
IAC Voltage 0.5 V - V
Junction Temperature -55°C to 150°C - °C

Key Features

  • Limits line current distortion to less than 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, 0 V to 5 V multout common-mode range.
  • VREF GOOD comparator and faster, improved accuracy ENABLE comparator.
  • UVLO options (16 V/10 V or 10.5 V/10 V).
  • Lower startup supply current (250 µA typical).
  • Enhanced multiply/divide circuit and improved common mode input range of the multiplier output/current amplifier input.

Applications

The UC2854BDWTRG4 is designed for use in power systems that require active power factor correction, such as:

  • Switch-mode power supplies.
  • High-power DC-DC converters.
  • Avionics applications requiring 400 Hz input.
  • Offline power supplies and preregulators.
  • Systems needing high power factor and low line current distortion.

Q & A

  1. What is the primary function of the UC2854BDWTRG4?

    The UC2854BDWTRG4 is designed to provide active power factor correction for power systems, achieving near-unity power factor by shaping the AC input line current waveform.

  2. What is the typical supply voltage for the UC2854BDWTRG4?

    The typical supply voltage (VCC) is 18 V, with a maximum of 22 V.

  3. What is the turn-on threshold for the VCC?

    The VCC turn-on threshold is typically 10.5 V.

  4. What is the bandwidth of the current amplifier?

    The current amplifier bandwidth is typically 5 MHz.

  5. What is the maximum current distortion achieved by the UC2854BDWTRG4?

    The line current distortion is limited to less than 3%.

  6. What are the UVLO options available for the UC2854BDWTRG4?

    The UVLO options are 16 V/10 V or 10.5 V/10 V.

  7. What is the typical startup supply current?

    The typical startup supply current is 250 µA.

  8. What are the key improvements in the multiplier circuitry of the UC2854BDWTRG4?

    The improvements include linearity, a 500 mV VAC offset, and a 0 V to 5 V multout common-mode range.

  9. What is the role of the VREF GOOD comparator?

    The VREF GOOD comparator ensures that the MOSFET driver output remains low if the supply of the 7.5 V reference is not yet up.

  10. What are the typical applications of the UC2854BDWTRG4?

    Typical applications include switch-mode power supplies, high-power DC-DC converters, avionics applications, and offline power supplies.

Product Attributes

Mode:Average Current
Frequency - Switching:80kHz ~ 120kHz
Current - Startup:250 µA
Voltage - Supply:10V ~ 20V
Operating Temperature:-40°C ~ 85°C
Mounting Type:Surface Mount
Package / Case:16-SOIC (0.295", 7.50mm Width)
Supplier Device Package:16-SOIC
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Similar Products

Part Number UC2854BDWTRG4 UC2854DWTRG4 UC3854BDWTRG4
Manufacturer Texas Instruments Texas Instruments Texas Instruments
Product Status Discontinued at Digi-Key Discontinued at Digi-Key Discontinued at Digi-Key
Mode Average Current Average Current Average Current
Frequency - Switching 80kHz ~ 120kHz 200kHz 200kHz
Current - Startup 250 µA 1.5 mA 250 µA
Voltage - Supply 10V ~ 20V 14.5V ~ 30V 10V ~ 20V
Operating Temperature -40°C ~ 85°C -40°C ~ 85°C 0°C ~ 70°C
Mounting Type Surface Mount Surface Mount Surface Mount
Package / Case 16-SOIC (0.295", 7.50mm Width) 16-SOIC (0.295", 7.50mm Width) 16-SOIC (0.295", 7.50mm Width)
Supplier Device Package 16-SOIC 16-SOIC 16-SOIC

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