UC2825A Status: ACTIVE

High Speed PWM Controller

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Datasheet

UC2823x, UC2825x, UC3823x, UC3825x: High Speed PWM Controller (Rev. D) (PDF 477 KB) 15544 views
30 Nov 2008

	UC1825A	UC2825A	UC3825A
Topology	Boost, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull	Boost, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull	Boost, Buck, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull
Control Method	Current Mode	Current Mode	Current Mode, Voltage
Duty Cycle(Max)(%)	50	50	50
PWM Outputs(#)	2	2	2
Frequency(Max)(kHz)	1000	1000	1000
UVLO Thresholds On/Off(V)	16/10	16/10	16/10
Pin/Package	16CDIP, 20LCCC	16PDIP, 16SOIC, 20PLCC	16PDIP, 16SOIC, 20PLCC
Regulated Outputs(#)	2	2	2
	Samples	Samples	Samples
	Inventory	Inventory	Inventory

Other qualified versions of UC2825A

Version	Part Number	Definition
Automotive	UC2825A-Q1	Q100 devices qualified for high-reliability automotive applications targeting zero defects
Enhanced Product	UC2825A-EP	Supports Defense, Aerospace and Medical Applications

Customers Who Evaluated This Product Also Evaluated

UCC2895: BiCMOS Advanced Phase Shift Resonant Controller
UC2825: High Speed PWM Controller
TPS54383: Dual 3A Non-Synchronous Buck Converter with Integrated High Side MOSFET, 300 kHz
TPS75003: Integrated Triple Supply Power Management IC for Xilinx(R) Spartan(TM)-3 FPGAs
TPS54286: Dual 2A Non-Synchronous Step Down SWIFT™ Converter with Integrated High Side MOSFET, 600 kHz

Product Information

Features

Improved versions of the UC3823/UC3825 PWMs
Compatible with Voltage-Mode or Current-Mode Control Methods
Practical Operation at Switching Frequencies to 1MHz
50-ns Propagation Delay to Output
High-Current Dual Totem Pole Outputs (2-A Peak)
Trimmed Oscillator Discharge Current
Low 100-µA Startup Current
Pulse-by-Pulse Current Limiting Comparator
Latched Overcurrent Comparator With Full Cycle Restart

Description

The UC3823A and UC3823B and the UC3825A and UC3825B family of PWM controllers are improved versions of the standard UC3823 and UC3825 family. Performance enhancements have been made to several of the circuit blocks. Error amplifier gain bandwidth product is 12 MHz, while input offset voltage is 2 mV. Current limit threshold is assured to a tolerance of 5%. Oscillator discharge current is specified at 10 mA for accurate dead time control. Frequency accuracy is improved to 6%. Startup supply current, typically 100 µA, is ideal for off-line applications. The output drivers are redesigned to actively sink current during UVLO at no expense to the startup current specification. In addition each output is capable of 2-A peak currents during transitions.

Functional improvements have also been implemented in this family. The UC3825 shutdown comparator is now a high-speed overcurrent comparator with a threshold of 1.2 V. The overcurrent comparator sets a latch that ensures full discharge of the soft-start capacitor before allowing a restart. While the fault latch is set, the outputs are in the low state. In the event of continuous faults, the soft-start capacitor is fully charged before discharge to insure that the fault frequency does not exceed the designed soft start period. The UC3825 CLOCK pin has become CLK/LEB. This pin combines the functions of clock output and leading edge blanking adjustment and has been buffered for easier interfacing.

The UC3825A and UC3825B have dual alternating outputs and the same pin configuration of the UC3825. The UC3823A and UC3823B outputs operate in phase with duty cycles from zero to less than 100%. The pin configuration of the UC3823A and UC3823B is the same as the UC3823 except pin 11 is now an output pin instead of the reference pin to the current limit comparator. "A" version parts have UVLO thresholds identical to the original UC3823 and UC3825. The "B" versions have UVLO thresholds of 16 V and 10 V, intended for ease of use in off-line applications.

Consult the application note, The UC3823A,B and UC3825A,B Enhanced Generation of PWM Controllers, (SLUA125) for detailed technical and applications information.

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
UC2825ADW	ACTIVE	-40 to 85	3.05 \| 1ku	SOIC (DW) \| 16	View	40 \| TUBE
UC2825ADWG4	ACTIVE	-40 to 85	3.05 \| 1ku	SOIC (DW) \| 16	View	40 \| TUBE
UC2825ADWTR	ACTIVE	-40 to 85	2.90 \| 1ku	SOIC (DW) \| 16	View	2000 \| LARGE T&R	Purchase Samples
UC2825ADWTRG4	ACTIVE	-40 to 85	2.90 \| 1ku	SOIC (DW) \| 16	View	2000 \| LARGE T&R	Purchase Samples
UC2825AN	ACTIVE	-40 to 85	3.05 \| 1ku	PDIP (N) \| 16	View	25 \| TUBE
UC2825ANG4	ACTIVE	-40 to 85	3.05 \| 1ku	PDIP (N) \| 16	View	25 \| TUBE
UC2825AQ	ACTIVE	-40 to 85	3.60 \| 1ku	PLCC (FN) \| 20	View	46 \| TUBE	Purchase Samples
UC2825AQG3	ACTIVE	-40 to 85	3.60 \| 1ku	PLCC (FN) \| 20	View	46 \| 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
UC2825ADW	As of 8:11 AM GMT, 03 Jul 2009	As of 8:11 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	8 Weeks	Americas	Arrow	486
			Avnet	>1k
			DigiKey	743
			Mouser Electronics	160
			Newark	449
			Rochester Electronics	50
		Asia	WPI	55
		Europe	Compel	22
			Farnell	75
			Spoerle	40
UC2825ADWG4	As of 8:11 AM GMT, 03 Jul 2009	As of 8:11 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	8 Weeks	Americas	DigiKey	Available
	8 Weeks	Europe	Farnell	32
UC2825ADWTR	As of 8:11 AM GMT, 03 Jul 2009	As of 8:11 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	6 Weeks	Americas	Arrow	>1k
			DigiKey	Available
			Rochester Electronics	>1k
UC2825ADWTRG4	As of 8:11 AM GMT, 03 Jul 2009	As of 8:11 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	6 Weeks	Americas	DigiKey	Available
UC2825AN	As of 8:11 AM GMT, 03 Jul 2009	As of 8:11 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	8 Weeks	Americas	Arrow	151
			DigiKey	312
			Newark	100
			Rochester Electronics	654
		Asia	WPI	300
		Europe	Arrow Northern Europe	100
UC2825ANG4	As of 8:11 AM GMT, 03 Jul 2009	As of 8:11 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	8 Weeks	Americas	DigiKey	Available
		Europe	EBV Elektronik	13
		Europe	Farnell	89
UC2825AQ	As of 8:11 AM GMT, 03 Jul 2009	As of 8:11 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	4 Weeks	Americas	Rochester Electronics	>1k
	4 Weeks	Asia	WPI	230
UC2825AQG3	As of 8:11 AM GMT, 03 Jul 2009	As of 8:11 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	4 Weeks	None Reported View Distributors
View all Distributors

** 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
UC2825ADW	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
UC2825ADWG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
UC2825ADWTR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
UC2825ADWTRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
UC2825AN	Green (RoHS & no Sb/Br)	CU NIPDAU	N/A for Pkg Type	View	View
UC2825ANG4	Green (RoHS & no Sb/Br)	CU NIPDAU	N/A for Pkg Type	View	View
UC2825AQ	Green (RoHS & no Sb/Br)	CU SN	Level-2-260C-1 YEAR	View	View
UC2825AQG3	Green (RoHS & no Sb/Br)	CU SN	Level-2-260C-1 YEAR	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

Most useful technical documents for UC2825A

Datasheet

UC2823x, UC2825x, UC3823x, UC3825x: High Speed PWM Controller (Rev. D) (PDF 477 KB) 15544 views
30 Nov 2008

Application Notes

U-128 The UC3823A,B and UC3825A,B Enhanced Generation of PWM Controllers (HTM 8 KB) 4840 views
05 Sep 1999 Read Abstract

View Application Notes for PWM Power Supply Controllers

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UC2825A Status: ACTIVE

High Speed PWM Controller

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