UC2854 Status: ACTIVE

High Power Factor Preregulator

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Datasheet

High Power Factor Preregulator (uc2854.pdf, 475 KB)
05 Sep 1999 Download

	UC1854	UC2854	UC3854
UVLO Thresholds On/Off(V)	16/10	16/10	16/10
Operating Supply(Max)(V)	30	30	30
Startup Current(mA)	1.5	1.5	1.5
Operating Supply Current(mA)	10	10	10
Vref(V)	7.5	7.5	7.5
Vref tol(%)	1.3	1.3	1.3
Duty Cycle(Max)(%)	95	95	95
Practical Operating Frequency(Max)(MHz)	0.2	0.2	0.2
Pin/Package	16CDIP	16PDIP,16SOIC	16PDIP,16SOIC,20PLCC
Rating	Military	Catalog	Catalog
	Samples	Samples	Samples
	Inventory	Inventory	Inventory

Other qualified versions of UC2854

Version	Part Number	Definition
Military	UC2854M	QML certified for Military and Defense Applications

Customers Who Evaluated This Product Also Evaluated

UC2854A: Enhanced High Power Factor Preregulator
UC2854B: Enhanced High Power Factor Preregulator

Product Information

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 Start-Up Supply Current
Fixed-Frequency PWM Drive
Low-Offset Analog Multiplier/Divider
1A Totem-Pole Gate Driver
Precision Voltage Reference

Description

The UC1854 provides active power factor correction for power systems that otherwise would draw non-sinusoidal current from sinusoidal power lines. This device implements all the control functions necessary to build a power supply capable of optimally using available power-line current while minimizing line-current distortion. To do this, the UC1854 contains a voltage amplifier, an analog multiplier/divider, a current amplifier, and a fixed-frequency PWM. In addition, the UC1854 contains a power MOSFET compatible gate driver, 7.5V reference, line anticipator, load-enable comparator, low-supply detector, and over-current comparator.

The UC1854 uses average current-mode control to accomplish fixed-frequency current control with stability and low distortion. Unlike peak current-mode, average current control accurately maintains sinusoidal line current without slope compensation and with minimal response to noise transients.

The UC1854�s high reference voltage and high oscillator amplitude minimize noise sensitivity while fast PWM elements permit chopping frequencies above 200kHz. The UC1854 can be used in single and three phase systems with line voltages that vary from 75 to 275 volts and line frequencies across the 50Hz to 400Hz range. To reduce the burden on the circuitry that supplies power to this device, the UC1854 features low starting supply current.

These devices are available packaged in 16-pin plastic and ceramic dual in-line packages, and a variety of surface-mount packages.

Pricing / Packaging / CAD Design Tools / Samples

			Price	Packaging			CAD Design Tools		Samples
Device	Status	Temp (^oC)	Price \| Quantity	Package \| Pins	Top Side Marking	Package QTY \| Package Carrier	Symbols	Footprints	Samples
UC2854DW	ACTIVE	-40 to 85	1.75 \| 100u	SOIC (DW) \| 16	View	40 \| TUBE
UC2854DWG4	ACTIVE	-40 to 85	1.75 \| 100u	SOIC (DW) \| 16	View	40 \| TUBE
UC2854DWTR	ACTIVE	-40 to 85	1.85 \| 100u	SOIC (DW) \| 16	View	2000 \| LARGE T&R	Purchase Samples
UC2854DWTRG4	ACTIVE	-40 to 85	1.85 \| 100u	SOIC (DW) \| 16	View	2000 \| LARGE T&R	Purchase Samples
UC2854N	ACTIVE	-40 to 85	1.75 \| 100u	PDIP (N) \| 16	View	25 \| TUBE	Purchase Samples
UC2854NG4	ACTIVE	-40 to 85	1.75 \| 100u	PDIP (N) \| 16	View	25 \| TUBE	Purchase Samples

* Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For higher volume price quotes,prices in local currency or delivery quotes, please contact your local Texas Instruments Sales Office or Authorized Distributor.

Inventory

	TI Inventory Status			Reported Distributor Inventory
UC2854DW	As of 8:49 AM GMT, 20 Nov 2008			As of 8:49 AM GMT, 20 Nov 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	3335 \| 18 Dec	4 Weeks	Americas	Arrow	198
		>10k \| 2 Jan			DigiKey	45
					Mouser Electronics	101
					Newark	122
					Rochester Electronics	>1k
				Asia	WPI	80
				Europe	Arrow Southern Europe	>1k
UC2854DWG4	As of 8:49 AM GMT, 20 Nov 2008			As of 8:49 AM GMT, 20 Nov 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	3335 \| 18 Dec	4 Weeks	Europe	Farnell	124
	0*	>10k \| 2 Jan	4 Weeks
UC2854DWTR	As of 8:49 AM GMT, 20 Nov 2008			As of 8:49 AM GMT, 20 Nov 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	>10k \| 18 Dec	4 Weeks	Americas	Rochester Electronics	>1k
UC2854DWTRG4	As of 8:49 AM GMT, 20 Nov 2008			As of 8:49 AM GMT, 20 Nov 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	>10k \| 18 Dec	4 Weeks	Americas	Avnet	>1k
UC2854N	As of 8:49 AM GMT, 20 Nov 2008			As of 8:49 AM GMT, 20 Nov 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	2475 \| 4 Dec	8 Weeks	Americas	Avnet	>1k
		>10k \| 2 Jan			Mouser Electronics	>1k
					Newark	>1k
					Rochester Electronics	502
				Europe	Arrow Southern Europe	200
UC2854NG4	As of 8:49 AM GMT, 20 Nov 2008			As of 8:49 AM GMT, 20 Nov 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	2475 \| 4 Dec	8 Weeks	Europe	Farnell	143
	0*	>10k \| 2 Jan	8 Weeks
View all Distributors

* Our information is updated daily, so please check back with us soon if this does not meet your needs. You may also contact your TI Authorized Distributor , including those listed above, for real time stock information.

** Lead time information is not available at this time. However, our information is updated daily so please check back with us soon. Please contact your preferred TI Authorized Distributor for additional information.

Quality & Lead (Pb)-Free Data

	Product Content				DPPM / MTBF / FIT Rate
Device	Eco Plan*	Lead / Ball Finish	MSL Rating / Peak Reflow	Details	Details
UC2854DW	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
UC2854DWG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
UC2854DWTR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
UC2854DWTRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
UC2854N	Green (RoHS & no Sb/Br)	CU NIPDAU	N/A for Pkg Type	View	View
UC2854NG4	Green (RoHS & no Sb/Br)	CU NIPDAU	N/A for Pkg Type	View	View

* The planned eco-friendly classification: Pb-Free (RoHS) or Pb-Free (RoHS Exempt) or Green (RoHS & no Sb/Br) - please click on the Product Content Details "View" link in the table above for the latest availability information and additional product content details.

If the information you are requesting is not available online at this time, contact one of our Product Information Centers regarding the availability of this information.

Technical Documents

Datasheets

High Power Factor Preregulator (uc2854.pdf, 475 KB)
05 Sep 1999 Download

Application Notes

Accurate PWM Duty Cycle Clamp (slua253.htm, 8 KB)
25 Jan 2002 Abstract
U-134 UC3854 Controlled Power Factor Correction Circuit Design (slua144.htm, 9 KB)
05 Sep 1999 Abstract
DN-41 Extend Current Transformer Range (slua174.htm, 8 KB)
05 Sep 1999 Abstract
DN-39E Optimizing Performance in UC3854 Power Factor Correction Applications (slua172.htm, 8 KB)
05 Sep 1999 Abstract

View Application Notes for Power Factor Correction ICs

User Guides

View User Guides for Power Factor Correction ICs

Tools & Software

Name	Part #	Company	Tool / Software Type
UCC28070 Evaluation module	UCC28070EVM	Texas Instruments	Development Boards/EVMs

Alternative Products - Are similar to UC2854
Customers Who Evaluated This Product Also Evaluated...
Part #	Name	Comments
UC2854A	Enhanced High Power Factor Preregulator	TI customers also evaluated this product.
UC2854B	Enhanced High Power Factor Preregulator	TI customers also evaluated this product.

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UC2854 Status: ACTIVE

High Power Factor Preregulator

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