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UCC2818A

ACTIVE

6kHz-220kHz CCM PFC controller with 10.5V/10V UVLO and Smaller Gate Drive Resistor, -40°C to 85°C

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UCC28180 ACTIVE 18-kHz-250-kHz CCM PFC controller with enhanced startup & transient response enhanced startup and transient response, lower startup and operating power

Product details

Topology Boost Control mode CCM Switching frequency (max) (kHz) 250 UVLO thresholds on/off (V) 10.5/10 Vin (max) (V) 18 Features < 150 W applications, > 750 W applications, Average current mode, Continuous Control Mode, Enable, Overvoltage protection Rating Catalog Operating temperature range (°C) -40 to 85 Duty cycle (max) (%) 100
Topology Boost Control mode CCM Switching frequency (max) (kHz) 250 UVLO thresholds on/off (V) 10.5/10 Vin (max) (V) 18 Features < 150 W applications, > 750 W applications, Average current mode, Continuous Control Mode, Enable, Overvoltage protection Rating Catalog Operating temperature range (°C) -40 to 85 Duty cycle (max) (%) 100
PDIP (N) 16 181.42 mm² 19.3 x 9.4 SOIC (D) 16 59.4 mm² 9.9 x 6 TSSOP (PW) 16 32 mm² 5 x 6.4
  • Controls Boost Preregulator to Near-Unity Power Factor
  • Limits Line Distortion
  • World Wide Line Operation
  • Overvoltage Protection
  • Accurate Power Limiting
  • Average Current Mode Control
  • Improved Noise Immunity
  • Improved Feed-Forward Line Regulation
  • Leading Edge Modulation
  • 150-µA Typical Start-Up Current
  • Low-Power BiCMOS Operation
  • 12-V to 17-V Operation
  • Frequency Range of 6 kHz to 220 kHz
  • Controls Boost Preregulator to Near-Unity Power Factor
  • Limits Line Distortion
  • World Wide Line Operation
  • Overvoltage Protection
  • Accurate Power Limiting
  • Average Current Mode Control
  • Improved Noise Immunity
  • Improved Feed-Forward Line Regulation
  • Leading Edge Modulation
  • 150-µA Typical Start-Up Current
  • Low-Power BiCMOS Operation
  • 12-V to 17-V Operation
  • Frequency Range of 6 kHz to 220 kHz

The UCC3817A and the UCC3818A family provides all 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 that of the ac input line voltage. Average current mode control maintains stable, low distortion sinusoidal line current.

Designed in Texas Instrument’s BiCMOS process, the UCC3817A/UCC3818A offers new features such as lower start-up current, lower power dissipation, overvoltage protection, a shunt UVLO detect circuitry, a leading-edge modulation technique to reduce ripple current in the bulk capacitor and an improved, low-offset (±2 mV) current amplifier to reduce distortion at light load conditions.

The UCC3817A/18A family of PFC Controllers is directly pin for pin compatible with the UCC3817/18 family of devices. Only the output stage of UCC3817A family has been modified to allow use of a smaller external gate drive resistor values. For some power supply designs where an adequately high enough gate drive resistor can not be used, the UCC3817A/18A family offers a more robust output stage at the cost of increasing the internal gate resistances. The gate drive of the UC3817A/18A family however remains strong at ±1.2 A of peak current capability.

UCC3817A offers an on-chip shunt regulator with low start-up current, suitable for applications utilizing a bootstrap supply. UCC3818A is intended for applications with a fixed supply (VCC). Both devices are available in the 16-pin D, N and PW packages.

The UCC3817A and the UCC3818A family provides all 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 that of the ac input line voltage. Average current mode control maintains stable, low distortion sinusoidal line current.

Designed in Texas Instrument’s BiCMOS process, the UCC3817A/UCC3818A offers new features such as lower start-up current, lower power dissipation, overvoltage protection, a shunt UVLO detect circuitry, a leading-edge modulation technique to reduce ripple current in the bulk capacitor and an improved, low-offset (±2 mV) current amplifier to reduce distortion at light load conditions.

The UCC3817A/18A family of PFC Controllers is directly pin for pin compatible with the UCC3817/18 family of devices. Only the output stage of UCC3817A family has been modified to allow use of a smaller external gate drive resistor values. For some power supply designs where an adequately high enough gate drive resistor can not be used, the UCC3817A/18A family offers a more robust output stage at the cost of increasing the internal gate resistances. The gate drive of the UC3817A/18A family however remains strong at ±1.2 A of peak current capability.

UCC3817A offers an on-chip shunt regulator with low start-up current, suitable for applications utilizing a bootstrap supply. UCC3818A is intended for applications with a fixed supply (VCC). Both devices are available in the 16-pin D, N and PW packages.

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Technical documentation

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Type Title Date
* Data sheet UCCx81xA BiCMOS Power Factor Preregulator datasheet (Rev. D) PDF | HTML 31 Aug 2016
User guide UCC3817 BiCMOS Power Factor Preregulator Evaluation Board (Rev. D) 13 Nov 2014
Application note Avoiding Audible Noise at Light Loads When Using Leading Edge Triggered PFC Con (Rev. C) 13 Apr 2011
Application note PFC Pre-Regulator Frequency Dithering Circuit (Rev. A) 14 May 2010
Application note Bootstrap Circuit for Green Mode Applications 27 Jan 2006
Application note Startup Current transient of the Leading Edge Triggered PFC Controllers 30 Jun 2004
Application note UCC3817 Current Sense Transformer Evaluation 13 Feb 2004
Application note PFC Family Differences UCC3817A/18A/19A and UCC3817/18/19 18 Aug 2003
Application note Accurate PWM Duty Cycle Clamp 25 Jan 2002
Application note DN-66 UC3854A/B and UC3855A/B Provide Power Limiting with Sinusoidal Input (Rev. A) 06 Nov 2001
Application note Synchronizing a PFC Controller from a Down Stream Controller Gate Drive 03 Nov 2000

Design & development

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Calculation tool

SLUC092 UCC2817/17A, UCC2818/18A, UCC3817/17A, UCC3818/18A MathCAD file

Supported products & hardware

Supported products & hardware

Products
Power factor correction (PFC) controllers
UCC2817 6kHz-220kHz CCM PFC controller with 16V/10V UVLO, -40°C to 85°C UCC2817A 6kHz-220kHz CCM PFC controller with 16V/10V UVLO and Smaller Gate Drive Resistor, -40°C to 85°C UCC2818 6kHz-220kHz CCM PFC controller with 10.5V/10V UVLO, -40°C to 85°C UCC2818A 6kHz-220kHz CCM PFC controller with 10.5V/10V UVLO and Smaller Gate Drive Resistor, -40°C to 85°C UCC3817 6kHz-220kHz CCM PFC controller with 16V/10V UVLO, 0°C to 70°C UCC3817A 6kHz-220kHz CCM PFC controller with 16V/10V UVLO and Smaller Gate Drive Resistor, 0°C to 70°C UCC3818 6kHz-220kHz CCM PFC controller with 10.5V/10V UVLO, 0°C to 70°C UCC3818A 6kHz-220kHz CCM PFC controller with 10.5V/10V UVLO and Smaller Gate Drive Resistor, 0°C to 70°C
Package Pins Download
PDIP (N) 16 View options
SOIC (D) 16 View options
TSSOP (PW) 16 View options

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