UCC3818A
6kHz-220kHz CCM PFC controller with 10.5V/10V UVLO and Smaller Gate Drive Resistor, 0°C to 70°C
UCC3818A
- 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 Instruments 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.
Technical documentation
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 | 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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Package | Pins | Download |
---|---|---|
PDIP (N) | 16 | View options |
SOIC (D) | 16 | View options |
TSSOP (PW) | 16 | View options |
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