UC3875 Status: ACTIVE

Phase Shift Resonant Controller

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Datasheet

Phase Shift Resonant Controller (Rev. C) (PDF 5286 KB)
24 May 2007

	UC1875
Topology	Full-Bridge
Control Method	Current Mode, Voltage Mode
Duty Cycle(Max)(%)	100
PWM Outputs(#)	4
Frequency(Max)(kHz)	1000
UVLO Thresholds On/Off(V)	10/7/9.2
Pin/Package	20CDIP, 28LCCC
Regulated Outputs(#)	4
	Samples
	Inventory

Other qualified versions of UC3875

Version	Part Number	Definition
Military	UC1875	QML certified for Military and Defense Applications

Customers Who Evaluated This Product Also Evaluated

UCC3895: BiCMOS Advanced Phase Shift PWM Controller
UC3879: Phase Shift Resonant Controller
UCC25600: 8-Pin High-Performance Resonant Mode Controller
TPS74401: Single Output LDO, 3.0A, Adj.(0.8 to 3.3V), Fast Transient Response, Programmable SoftStart
TPS5430: 5.5V to 36V, 3A, 500kHz Step Down SWIFT™ Converter
TPS54386: Dual 3A Non-Synchronous Buck Converter with Integrated High Side MOSFET, 600 kHz

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Product Information

Features

Zero to 100% Duty Cycle Control
Programmable Output Turn-On Delay
Compatible with Voltage or Current Mode Topologies
Practical Operation at Switching Frequencies to 1MHz
Four 2A Totem Pole Outputs
10MHz Error Amplifier
Undervoltage Lockout
Low Startup Current—150µA
Outputs Active Low During UVLO
Soft-Start Control
Latched Over-Current Comparator With Full Cycle Restart
Trimmed Reference

Description

The UC1875 family of integrated circuits implements control of a bridge power stage by phase-shifting the switching of one half-bridge with respect to the other, allowing constant frequency pulse-width modulation in combination with resonant, zero-voltage switching for high efficiency performance at high frequencies. This family of circuits may be configured to provide control in either voltage or current mode operation, with a separate over-current shutdown for fast fault protection.

A programmable time delay is provided to insert a dead-time at the turn-on of each output stage. This delay, providing time to allow the resonant switching action, is independently controllable for each output pair (A-B, C-D).

With the oscillator capable of operation at frequencies in excess of 2MHz, overall switching frequencies to 1MHz are practical. In addition to the standard free running mode, with the CLOCKSYNC pin, the user may configure these devices to accept an external clock synchronization signal, or may lock together up to 5 units with the operational frequency determined by the fastest device.

Protective features include an undervoltage lockout which maintains all outputs in an active-low state until the supply reaches a 10.75V threshold. 1.5V hysteresis is built in for reliable, boot-strapped chip supply. Over-current protection is provided, and will latch the outputs in the OFF state within 70nsec of a fault. The current-fault circuitry implements full-cycle restart operation.

Additional features include an error amplifier with band-width in excess of 7MHz, a 5V reference, provisions for soft-starting, and flexible ramp generation and slope compensation circuitry.

These devices are available in 20-pin DIP, 28-pin "bat-wing" SOIC and 28 lead power PLCC plastic packages for operation over both 0°C to 70°C and –25°C to +85°C temperature ranges; and in hermetically sealed cerdip, and surface mount packages for –55°C to +125°C operation.

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
UC3875DWP	ACTIVE	0 to 70	5.35 \| 1ku	SOIC (DW) \| 28	View	20 \| TUBE
UC3875DWPG4	ACTIVE	0 to 70	5.35 \| 1ku	SOIC (DW) \| 28	View	20 \| TUBE
UC3875DWPTR	ACTIVE	0 to 70	4.95 \| 1ku	SOIC (DW) \| 28	View	1000 \| LARGE T&R	Purchase Samples
UC3875DWPTR/81316	OBSOLETE			SOIC (DW) \| 28	View				Not Available
UC3875DWPTR81316G4	OBSOLETE			SOIC (DW) \| 28	View				Not Available
UC3875DWPTRG4	ACTIVE	0 to 70	4.95 \| 1ku	SOIC (DW) \| 28	View	1000 \| LARGE T&R	Purchase Samples
UC3875N	ACTIVE	0 to 70	5.35 \| 1ku	PDIP (N) \| 20	View	20 \| TUBE
UC3875NG4	ACTIVE	0 to 70	5.35 \| 1ku	PDIP (N) \| 20	View	20 \| TUBE
UC3875QP	ACTIVE	0 to 70	6.30 \| 1ku	PLCC (FN) \| 28	View	37 \| 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 9:43 AM GMT, 06 Nov 2009
Region	Company	In Stock	Purchase
TI Lead Time*: 20 WeeksUC3875DWP
Americas	Arrow	689
	Avnet	295
	Newark	24
	Rochester Electronics	>1k
Asia	Farnell Asia	24
Asia	WPI	75
Europe	Arrow Southern Europe	20
Worldwide	DigiKey	376
TI Lead Time*: 20 WeeksUC3875DWPG4
Asia	Farnell Asia	19
Europe	Farnell	7
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksUC3875DWPTR
Americas	Rochester Electronics	>1k
Worldwide	DigiKey	Available
Call**UC3875DWPTR/81316
Americas	Rochester Electronics	>1k
TI Lead Time*: 20 WeeksUC3875DWPTRG4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksUC3875N
Americas	Arrow	89
	Avnet	381
	Newark	560
Asia	WPI	208
Europe	Compel	300
Worldwide	DigiKey	348
Worldwide	Mouser Electronics	262
TI Lead Time*: 20 WeeksUC3875NG4
Asia	Farnell Asia	99
Europe	Farnell	99
Worldwide	DigiKey	Available
TI Lead Time*: 4 WeeksUC3875QP
Americas	Arrow	17
Americas	Rochester Electronics	3
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
UC3875DWP	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
UC3875DWPG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
UC3875DWPTR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
UC3875DWPTRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
UC3875N	Green (RoHS & no Sb/Br)	CU NIPDAU	N/A for Pkg Type	View	View
UC3875NG4	Green (RoHS & no Sb/Br)	CU NIPDAU	N/A for Pkg Type	View	View
UC3875QP	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-3-260C-168 HR	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 UC3875

Datasheet

Phase Shift Resonant Controller (Rev. C) (PDF, 5286 KB)
24 May 2007

Application Notes

A Comparison Between the BiCMOS UCC3895 Phase Shift Controller and the UC3875 (HTM, 8 KB) 4752 views
22 Feb 2001 Read Abstract
Synchronous Rectifiers of a Current Doubler (HTM, 8 KB) 5797 views
27 Feb 2003 Read Abstract
Current Doubler Rectifier Offers Ripple Current Cancellation (HTM, 8 KB) 7369 views
21 Sep 2004 Read Abstract
U-136A Phase Shifted, Zero Voltage Transition Design Considerations (HTM, 9 KB) 9642 views
05 Sep 1999 Read Abstract
DN-63 The Current-Doubler Rectifier: An Alternative Rectification Technique (HTM, 9 KB) 6836 views
12 Jan 2001 Read Abstract

View Application Notes for PWM Power Supply Controllers

Tools & Software

Name	Part #	Company	Tool / Software Type
UCC3895 Evaluation Module	UCC3895EVM-001	Texas Instruments	Development Boards/EVMs

Part #	Name	Product Family	Comments
UCC3895	BiCMOS Advanced Phase Shift PWM Controller	AC/DC AND DC/DC POWER SUPPLIES - PWM POWER SUPPLY CONTROLLERS	This device has SIMILAR FUNCTIONALITY, newer device with better features
Customers Who Evaluated This Product Also Evaluated...
UCC3895	BiCMOS Advanced Phase Shift PWM Controller	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.
UC3879	Phase Shift Resonant Controller	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.
UCC25600	8-Pin High-Performance Resonant Mode Controller	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.
UCC2895	BiCMOS Advanced Phase Shift Resonant Controller	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.
UC1875	Phase Shift Resonant Controller	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.
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TPS54386	Dual 3A Non-Synchronous Buck Converter with Integrated High Side MOSFET, 600 kHz	DC/DC CONVERTERS (INTEGRATED SWITCH)-STEP-DOWN REGULATORS	TI customers also evaluated this product.
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UC3875 Status: ACTIVE

Phase Shift Resonant Controller

See Also

Most Popular Links

Datasheet

Other qualified versions of UC3875

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

Tools & Software

Support and Community

Customer Tags

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