UC1825 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 UC1825

Version	Part Number	Definition
Catalog	UC3825	TI's standard catalog product
Space	UC1825-SP	Radiation tolerant, ceramic packaging and qualified for use in Space-based application

Customers Who Evaluated This Product Also Evaluated

UC1825A: High Speed PWM Controller
UC1825-SP: High Speed PWM Controller
UC1825A-SP: High Speed PWM Controller

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.

View All Description in Datasheet

Pricing / Packaging / CAD Design Tools / Samples

				Price	Packaging		CAD Design Tools		Samples
Device	Status	Temp (^oC)	DSCC #	Price \| Quantity	Package \| Pins	Package QTY \| Package Carrier	Symbols	Footprints	Samples
5962-87681012A	ACTIVE	-55 to 125		20.00 \| 100u	LCCC (FK) \| 20	1 \| TUBE	Purchase Samples
5962-8768101EA	ACTIVE	-55 to 125		13.45 \| 100u	CDIP (J) \| 16	1 \| TUBE	Contact TI Distributor or Sales Office
5962-8768101QFA	ACTIVE	-55 to 125		23.38 \| 100u	CFP (W) \| 16	1 \| TUBE		Purchase Samples
UC1825J	ACTIVE	-55 to 125		9.43 \| 100u	CDIP (J) \| 16	1 \| TUBE	Contact TI Distributor or Sales Office
UC1825J883B	ACTIVE	-55 to 125	5962-8768101EA	13.45 \| 100u	CDIP (J) \| 16	1 \| TUBE	Contact TI Distributor or Sales Office
UC1825L	ACTIVE	-55 to 125		13.64 \| 100u	LCCC (FK) \| 20	1 \| TUBE	Contact TI Distributor or Sales Office
UC1825L883B	ACTIVE	-55 to 125	5962-87681012A	20.00 \| 100u	LCCC (FK) \| 20	1 \| TUBE	Contact TI Distributor or Sales Office
UC1825W883B	ACTIVE	-55 to 125	5962-8768101QFA	23.38 \| 100u	CFP (W) \| 16	1 \| 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

Reported Distributor Inventory as of 9:55 AM GMT, 22 Nov 2009
Region	Company	In Stock	Purchase
TI Lead Time*: 8 Weeks5962-87681012A
Americas	Arrow	4
Americas	Avnet	17
TI Lead Time*: 8 Weeks5962-8768101EA
Americas	Arrow	67
Americas	Avnet	697
Europe	Avnet-SILICA	8
TI Lead Time*: 8 Weeks5962-8768101QFA
Americas	Arrow	900
Americas	Rochester Electronics	38
TI Lead Time*: 8 WeeksUC1825J
Americas	Arrow	>1k
Americas	Avnet	121
Europe	Arrow Northern Europe	34
	Avnet-SILICA	>1k
	EBV Elektronik	73
TI Lead Time*: 8 WeeksUC1825J883B
Americas	Arrow	64
TI Lead Time*: 8 WeeksUC1825L
Europe	EBV Elektronik	3
TI Lead Time*: 8 WeeksUC1825L883B
None Reported View Distributors
TI Lead Time*: 8 WeeksUC1825W883B
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
5962-87681012A	TBD	POST-PLATE	N/A for Pkg Type	View	View
5962-8768101EA	TBD	A42	N/A for Pkg Type	View	View
5962-8768101QFA	TBD	A42	N/A for Pkg Type	View	View
UC1825J	TBD	A42	N/A for Pkg Type	View	View
UC1825J883B	TBD	A42	N/A for Pkg Type	View	View
UC1825L	TBD	POST-PLATE	N/A for Pkg Type	View	View
UC1825L883B	TBD	POST-PLATE	N/A for Pkg Type	View	View
UC1825W883B	TBD	A42	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

Most useful technical documents for UC1825

Datasheet

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

Application Notes

U-110 1.5 Mhz Current Mode IC Controlled 50-Watt Power Supply (HTM, 8 KB) 5717 views
05 Sep 1999 Read Abstract
U-111, Practical Considerations in Current Mode Power Supplies (HTM, 8 KB) 11960 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
UC1825A	High Speed PWM Controller	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.
UC1825-SP	High Speed PWM Controller	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.
UC1825A-SP	High Speed PWM Controller	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.

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UC1825 Status: ACTIVE

High Speed PWM Controller

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