UC3825 Status: ACTIVE

High Speed PWM Controller

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Datasheet

High Speed PWM Controller (Rev. A) (PDF 1091 KB)
24 Feb 2004

	UC1825	UC2825	UC3825
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 Mode
Duty Cycle(Max)(%)	50	50	50
PWM Outputs(#)	2	2	2
Frequency(Max)(kHz)	1000	1000	1000
UVLO Thresholds On/Off(V)	9.2/8.4	9.2/8.4	9.2/8.4
Pin/Package	16CDIP, 16CFP, 20LCCC	16PDIP, 16SOIC, 20PLCC	16PDIP, 20PLCC, 16SOIC
Regulated Outputs(#)	2	2	2
	Samples	Samples	Samples
	Inventory	Inventory	Inventory

Other qualified versions of UC3825

Version	Part Number	Definition
Catalog	UC3825M	TI's standard catalog product
Military	UC1825	QML certified for Military and Defense Applications

Customers Who Evaluated This Product Also Evaluated

UC3825A: High Speed PWM Controller
UC2825: High Speed PWM Controller
TL494: PWM Control Circuit
PTB48600A: 85 W Dual Complementary-Output DC/DC Converter
UC39431: Precision Adjustable Shunt Regulator
TL430: Adjustable Shunt Regulator

More Related Products

Product Information

Features

Compatible with Voltage or Current Mode Topologies
Practical Operation Switching Frequencies to 1MHz
50ns Propagation Delay to Output
High Current Dual Totem Pole Outputs (1.5A Peak)
Wide Bandwidth Error Amplifier
Fully Latched Logic with Double Pulse Suppression
Pulse-by-Pulse Current Limiting
Soft Start / Max. Duty Cycle Control
Under-Voltage Lockout with Hysteresis
Low Start Up Current (1.1mA)

Description

The UC1825 family of PWM control ICs is optimized for high frequency switched mode power supply applications. Particular care was given to minimizing propagation delays through the comparators and logic circuitry while maximizing bandwidth and slew rate of the error amplifier. This controller is designed for use in either current-mode or voltage mode systems with the capability for input voltage feed-forward.

Protection circuitry includes a current limit comparator with a 1V threshold, a TTL compatible shutdown port, and a soft start pin which will double as a maximum duty cycle clamp. The logic is fully latched to provide jitter free operation and prohibit multiple pulses at an output. An under-voltage lockout section with 800mV of hysteresis assures low start up current. During under-voltage lockout, the outputs are high impedance.

These devices feature totem pole outputs designed to source and sink high peak currents from capacitive loads, such as the gate of a power MOSFET. The on state is designed as a high level.

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
UC3825DW	ACTIVE	0 to 70	1.75 \| 1ku	SOIC (DW) \| 16	View	40 \| TUBE
UC3825DWG4	ACTIVE	0 to 70	1.75 \| 1ku	SOIC (DW) \| 16	View	40 \| TUBE
UC3825DWTR	ACTIVE	0 to 70	1.70 \| 1ku	SOIC (DW) \| 16	View	2000 \| LARGE T&R	Purchase Samples
UC3825DWTRG4	ACTIVE	0 to 70	1.70 \| 1ku	SOIC (DW) \| 16	View	2000 \| LARGE T&R	Purchase Samples
UC3825N	ACTIVE	0 to 70	1.75 \| 1ku	PDIP (N) \| 16	View	25 \| TUBE
UC3825NG4	ACTIVE	0 to 70	1.75 \| 1ku	PDIP (N) \| 16	View	25 \| TUBE
UC3825Q	ACTIVE	0 to 70	1.75 \| 1ku	PLCC (FN) \| 20	View	46 \| TUBE	Purchase Samples
UC3825QG3	ACTIVE	0 to 70	1.75 \| 1ku	PLCC (FN) \| 20	View	46 \| TUBE	Purchase Samples
UC3825QTR	ACTIVE	0 to 70	1.70 \| 1ku	PLCC (FN) \| 20	View	1000 \| LARGE T&R	Purchase Samples
UC3825QTRG3	ACTIVE	0 to 70	1.70 \| 1ku	PLCC (FN) \| 20	View	1000 \| LARGE T&R	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

Reported Distributor Inventory as of 9:49 AM GMT, 08 Nov 2009
Region	Company	In Stock	Purchase
TI Lead Time*: 20 WeeksUC3825DW
Americas	Arrow	352
Americas	Newark	604
Asia	Farnell Asia	644
Asia	WPI	61
Europe	Abacus Polar	11
Europe	Avnet-SILICA	133
Worldwide	DigiKey	>1k
TI Lead Time*: 20 WeeksUC3825DWG4
Asia	Farnell Asia	67
Europe	EBV Elektronik	>1k
Europe	Farnell	13
Worldwide	DigiKey	Available
TI Lead Time*: 4 WeeksUC3825DWTR
Americas	Rochester Electronics	>1k
Worldwide	DigiKey	Available
TI Lead Time*: 4 WeeksUC3825DWTRG4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksUC3825N
Americas	Arrow	>1k
	Avnet	600
	Newark	366
	Rochester Electronics	>1k
Asia	Farnell Asia	500
Asia	WPI	8
Europe	Arrow Southern Europe	800
	Avnet-SILICA	>1k
	EBV Elektronik	5
	Spoerle	25
Worldwide	DigiKey	273
Worldwide	Mouser Electronics	131
TI Lead Time*: 20 WeeksUC3825NG4
Europe	EBV Elektronik	>1k
Worldwide	DigiKey	Available
TI Lead Time*: 4 WeeksUC3825Q
Worldwide	Mouser Electronics	169
TI Lead Time*: 4 WeeksUC3825QG3
None Reported View Distributors
TI Lead Time*: 10 WeeksUC3825QTR
None Reported View Distributors
TI Lead Time*: 10 WeeksUC3825QTRG3
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
UC3825DW	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
UC3825DWG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
UC3825DWTR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
UC3825DWTRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
UC3825N	Green (RoHS & no Sb/Br)	CU NIPDAU	N/A for Pkg Type	View	View
UC3825NG4	Green (RoHS & no Sb/Br)	CU NIPDAU	N/A for Pkg Type	View	View
UC3825Q	Green (RoHS & no Sb/Br)	CU SN	Level-2-260C-1 YEAR	View	View
UC3825QG3	Green (RoHS & no Sb/Br)	CU SN	Level-2-260C-1 YEAR	View	View
UC3825QTR	Green (RoHS & no Sb/Br)	CU SN	Level-2-260C-1 YEAR	View	View
UC3825QTRG3	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 UC3825

Datasheet

High Speed PWM Controller (Rev. A) (PDF, 1091 KB)
24 Feb 2004

Application Notes

Current Doubler Rectifier Offers Ripple Current Cancellation (HTM, 8 KB) 7383 views
21 Sep 2004 Read Abstract
U-110 1.5 Mhz Current Mode IC Controlled 50-Watt Power Supply (HTM, 8 KB) 5601 views
05 Sep 1999 Read Abstract

View Application Notes for PWM Power Supply Controllers

Customers Who Evaluated This Product Also Evaluated...
Part #	Name	Product Family	Comments
UC3825A	High Speed PWM Controller	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.
UC2825	High Speed PWM Controller	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.
TL494	PWM Control Circuit	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.
UCC3895	BiCMOS Advanced Phase Shift PWM Controller	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.
UC3846	Current Mode PWM Controller	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.
UC28025	Economy High Speed PWM Controller	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.
PTB48600A	85 W Dual Complementary-Output DC/DC Converter	ISOLATED DC/DC CONVERTERS-36V TO 75V INPUT	TI customers also evaluated this product.
UC39431	Precision Adjustable Shunt Regulator	POWER SUPPLY SUPPORT-FEEDBACK SIGNAL GENERATORS	TI customers also evaluated this product.
TL430	Adjustable Shunt Regulator	VOLTAGE REFERENCE-SHUNT VOLTAGE REFERENCE	TI customers also evaluated this product.

UC3825 Status: ACTIVE

High Speed PWM Controller

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Datasheet

Other qualified versions of UC3825

Customers Who Evaluated This Product Also Evaluated

Product Information

Features

Description

Pricing / Packaging / CAD Design Tools / Samples

Inventory

Quality & Lead (Pb)-Free Data

Technical Documents

Datasheet

Application Notes

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